InlineFunctionsTest.java

/*
 * Copyright 2008 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.javascript.jscomp;

import com.google.javascript.jscomp.CompilerOptions.Reach;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Inline function tests.
 *
 * @author johnlenz@google.com (john lenz)
 */

@RunWith(JUnit4.class)
public class InlineFunctionsTest extends CompilerTestCase {
  Reach inliningReach;
  final boolean allowExpressionDecomposition = true;
  final boolean allowFunctionExpressionInlining = true;
  boolean assumeStrictThis;
  boolean assumeMinimumCapture;
  int maxSizeAfterInlining;

  static final String EXTERNS = "/** @nosideeffects */ function nochg(){}\nfunction chg(){}\n";

  public InlineFunctionsTest() {
    super(EXTERNS);
  }

  // Overridden by one test method that needs to disable this.
  void maybeEnableInferConsts() {
    enableInferConsts();
  }

  @Override
  @Before
  public void setUp() throws Exception {
    super.setUp();
    maybeEnableInferConsts();
    enableNormalize();
    enableComputeSideEffects();
    inliningReach = Reach.ALL;
    assumeStrictThis = false;
    assumeMinimumCapture = false;
    maxSizeAfterInlining = CompilerOptions.UNLIMITED_FUN_SIZE_AFTER_INLINING;
  }

  @Override
  protected CompilerPass getProcessor(Compiler compiler) {
    compiler.resetUniqueNameId();

    return new InlineFunctions(
        compiler,
        compiler.getUniqueNameIdSupplier(),
        inliningReach,
        assumeStrictThis,
        assumeMinimumCapture,
        maxSizeAfterInlining);
  }

  /**
   * Returns the number of times the pass should be run before results are
   * verified.
   */
  @Override
  protected int getNumRepetitions() {
    // Some inlining can only be done in multiple passes.
    return 3;
  }

  @Test
  public void testNoInline() {
    testSame("/** @noinline */ function foo(){} foo();foo();foo();");
    testSame("/** @noinline */ var foo = function(){}; foo();foo();foo();");
  }

  @Test
  public void testInlineEmptyFunction1() {
    // Empty function, no params.
    test("function foo(){}" +
        "foo();",
        "void 0;");
  }

  @Test
  public void testInlineEmptyFunction2() {
    // Empty function, params with no side-effects.
    test("function foo(){}\n foo(1, new Date, function(){});", "void 0;");
  }

  @Test
  public void testInlineEmptyFunction3() {
    // Empty function, multiple references.
    test("function foo(){}\n foo();foo();foo();", "void 0;void 0;void 0");
  }

  @Test
  public void testInlineEmptyFunction4() {
    // Empty function, params with side-effects forces block inlining.
    test("function foo(){}\n foo(x());", "{var JSCompiler_inline_anon_param_0 = x();}");
  }

  @Test
  public void testInlineEmptyFunction6() {
    test("if (window) { f(); function f() {} }",
        "if (window) { void 0; }");
  }

  @Test
  public void testInlineFunctions1() {
    // As simple a test as we can get.
    test("function foo(){ return 4 }" +
        "foo();",
        "4");
  }

  @Test
  public void testInlineFunctions2() {
    // inline simple constants
    // NOTE: CD is not inlined.
    test("var t;var AB=function(){return 4};" +
         "function BC(){return 6;}" +
         "CD=function(x){return x + 5};x=CD(3);y=AB();z=BC();",
         "var t;CD=function(x){return x+5};x=CD(3);y=4;z=6"
         );
  }

  @Test
  public void testInlineFunctions3() {
    // inline simple constants
    test("var t;var AB=function(){return 4};" +
        "function BC(){return 6;}" +
        "var CD=function(x){return x + 5};x=CD(3);y=AB();z=BC();",
        "var t;x=3+5;y=4;z=6");
  }

  @Test
  public void testInlineFunctions4() {
    // don't inline if there are multiple definitions (need DFA for that).
    test("var t; var AB = function() { return 4 }; " +
        "function BC() { return 6; }" +
        "CD = 0;" +
        "CD = function(x) { return x + 5 }; x = CD(3); y = AB(); z = BC();",

        "var t;CD=0;CD=function(x){return x+5};x=CD(3);y=4;z=6");
  }

  @Test
  public void testInlineFunctions5() {
    // inline additions
    test("var FOO_FN=function(x,y) { return \"de\" + x + \"nu\" + y };" +
         "var a = FOO_FN(\"ez\", \"ts\")",

         "var a=\"de\"+\"ez\"+\"nu\"+\"ts\"");
  }

  @Test
  public void testInlineFunctions6() {
    // more complex inlines
    test("function BAR_FN(x, y, z) { return z(nochg(x + y)) }" +
         "alert(BAR_FN(1, 2, baz))",

         "alert(baz(nochg(1+2)))");
  }

  @Test
  public void testInlineFunctions7() {
    // inlines appearing multiple times
    test("function FN(x,y,z){return x+x+y}" +
         "var b=FN(1,2,3)",

         "var b=1+1+2");
  }

  @Test
  public void testInlineFunctions8() {
    // check correct parenthesization
    test("function MUL(x,y){return x*y}function ADD(x,y){return x+y}" +
         "var a=1+MUL(2,3);var b=2*ADD(3,4)",

         "var a=1+2*3;var b=2*(3+4)");
  }

  @Test
  public void testInlineFunctions9() {
    // don't inline if the input parameter is modified.
    test("function INC(x){return x++}" +
         "var y=INC(i)",
         "var y;{var x$jscomp$inline_0=i;" +
         "y=x$jscomp$inline_0++}");
  }

  @Test
  public void testInlineFunctions10() {
    test(
        lines(
            "function INC(x){return x++}",
            "var y = INC(i);",
            "y = INC(i);"),
        lines(
            "var y;",
            "{",
            "  var x$jscomp$inline_0 = i;",
            "  y = x$jscomp$inline_0++;",
            "}",
            "{",
            "  var x$jscomp$inline_2 = i;",
            "  y = x$jscomp$inline_2++;",
            "}"));
  }

  @Test
  public void testInlineFunctions11() {
    test("function f(x){return x}" +
          "var y=f(i)",
          "var y=i");
  }

  @Test
  public void testInlineFunctions13() {
    // inline as block if the input parameter has side-effects.
    test("function f(x){return x}" +
         "var y=f(i++)",
         "var y=i++");
  }

  @Test
  public void testInlineFunctions13a() {
    // inline as block if the input parameter has side-effects.
    test("function f(x){return random() || x}" +
         "var y=f(i++)",
         "var y;{var x$jscomp$inline_0=i++;y=random() || x$jscomp$inline_0}");
  }

  @Test
  public void testInlineFunctions14() {
    // don't remove functions that are referenced on other ways
    test("function FOO(x){return x}var BAR=function(y){return y}" +
             ";b=FOO;a(BAR);x=FOO(1);y=BAR(2)",

         "function FOO(x){return x}var BAR=function(y){return y}" +
             ";b=FOO;a(BAR);x=1;y=2");
  }

  @Test
  public void testInlineFunctions15a() {
    // closure factories: do inline into global scope.
    test("function foo(){return function(a){return a+1}}" +
         "var b=function(){return c};" +
         "var d=b()+foo()",

         "var d=c+function(a){return a+1}");
  }

  @Test
  public void testInlineFunctions15b() {
    assumeMinimumCapture = false;

    // closure factories: don't inline closure with locals into global scope.
    test(
        lines(
            "function foo(){var x; return function(a){ return a+1; };}",
            "var b = function() { return c; };",
            "var d = b() + foo()"),
        "function foo() { var x; return function(a){return a+1}; } var d = c+foo();");

    assumeMinimumCapture = true;

    test(
        lines(
            "function foo() { var x; return function(a) { return a + 1; }; }",
            "var b = function() { return c; };",
            "var d = b() + foo()"),
        lines(
            "var JSCompiler_inline_result$jscomp$0;",
            "{",
            "  var x$jscomp$inline_1;",
            "  JSCompiler_inline_result$jscomp$0 = function(a$jscomp$inline_2) {",
            "    return a$jscomp$inline_2 + 1;",
            "  };",
            "}",
            "var d = c+JSCompiler_inline_result$jscomp$0;"));
  }

  @Test
  public void testInlineFunctions15c() {
    assumeMinimumCapture = false;

    // closure factories: don't inline into non-global scope.
    test("function foo(){return function(a){return a+1}}" +
         "var b=function(){return c};" +
         "function _x(){ var d=b()+foo() }",

         "function foo(){return function(a){return a+1}}" +
         "function _x(){ var d=c+foo() }");

    assumeMinimumCapture = true;

    // closure factories: don't inline into non-global scope.
    test("function foo(){return function(a){return a+1}}" +
         "var b=function(){return c};" +
         "function _x(){ var d=b()+foo() }",

         "function _x(){var d=c+function(a){return a+1}}");

  }

  @Test
  public void testInlineFunctions15d() {
    assumeMinimumCapture = false;

    // closure factories: don't inline functions with vars.
    test(
        lines(
            "function foo() { var x; return function(a) { return a+1; }; }",
            "var b = function() { return c; };",
            "function _x(){ var d = b()+foo() }"),
        lines(
            "function foo() {",
            "  var x;",
            "  return function(a){ return a+1; };",
            "}",
            "function _x() { var d = c + foo(); }"));

    assumeMinimumCapture = true;

    // closure factories: inline functions with vars.
    test(
        lines(
            "function foo(){var x; return function(a){return a+1}}",
            "var b = function(){return c};",
            "function _x(){ var d=b()+foo() }"),
        lines(
            "function _x() {",
            "  var JSCompiler_inline_result$jscomp$0;",
            "  {",
            "    var x$jscomp$inline_1;",
            "    JSCompiler_inline_result$jscomp$0 = function(a$jscomp$inline_2) {",
            "      return a$jscomp$inline_2+1",
            "    };",
            "  }",
            "  var d = c + JSCompiler_inline_result$jscomp$0;",
            "}"));
  }

  @Test
  public void testInlineFunctions16a() {
    assumeMinimumCapture = false;

    testSame("function foo(b){return window.bar(function(){c(b)})} var d=foo(e)");

    assumeMinimumCapture = true;

    test(
        "function foo(b){return window.bar(function(){c(b)})}" +
        "var d=foo(e)",
        "var d;{var b$jscomp$inline_0=e;" +
        "d=window.bar(function(){c(b$jscomp$inline_0)})}");
  }

  @Test
  public void testInlineFunctions16b() {
    test("function foo(){return window.bar(function(){c()})}" +
         "var d=foo(e)",
         "var d=window.bar(function(){c()})");
  }

  @Test
  public void testInlineFunctions17() {
    // don't inline recursive functions
    testSame("function foo(x){return x*x+foo(3)}var bar=foo(4)");
  }

  @Test
  public void testInlineFunctions19() {
    // TRICKY ... test nested inlines
    // with block inlining possible
    test("function foo(a, b){return a+b}" +
        "function bar(d){return c}" +
        "var d=foo(bar(1),e)",
        "var d=c+e;");
  }

  @Test
  public void testInlineFunctions21() {
    // with block inlining possible
    test("function foo(a, b){return a+b}" +
        "function bar(d){return c}" +
        "var d=bar(foo(1,e))",
        "var d=c");
  }

  @Test
  public void testInlineFunctions22() {
    // Another tricky case ... test nested compiler inlines
    test(
        lines(
            "function plex(a){if(a) return 0;else return 1;}",
            "function foo(a, b){return bar(a+b)}",
            "function bar(d){return plex(d)}",
            "var d=foo(1,2)"),
        lines(
            "var d;",
            "{",
            "  JSCompiler_inline_label_plex_1:{",
            "    if(1+2) {",
            "      d = 0;",
            "      break JSCompiler_inline_label_plex_1;",
            "    } else {",
            "      d = 1;",
            "      break JSCompiler_inline_label_plex_1;",
            "    }",
            "    d=void 0;",
            "  }",
            "}"));
  }

  @Test
  public void testInlineFunctions23() {
    // Test both orderings again
    test(
        lines(
            "function complex(a){if(a) return 0;else return 1;}",
            "function bar(d){return complex(d)}",
            "function foo(a, b){return bar(a+b)}",
            "var d=foo(1,2)"),
        lines(
            "var d;",
            "{",
            "  JSCompiler_inline_label_complex_1:{",
            "    if (1+2) {",
            "      d=0;",
            "      break JSCompiler_inline_label_complex_1;",
            "    } else {",
            "      d = 1;",
            "      break JSCompiler_inline_label_complex_1;",
            "    }",
            "    d=void 0",
            "  }",
            "}"));
  }

  @Test
  public void testInlineFunctions24() {
    // Don't inline functions with 'arguments' or 'this'
    testSame("function foo(x){return this}foo(1)");
  }

  @Test
  public void testInlineFunctions26() {
    // Don't inline external functions
    testSame("function _foo(x){return x}_foo(1)");
  }

  @Test
  public void testInlineFunctions27() {
    test("var window = {}; function foo(){window.bar++; return 3;}" +
        "var x = {y: 1, z: foo(2)};",
        "var window={};" +
        "var JSCompiler_inline_result$jscomp$0;" +
        "{" +
        "  window.bar++;" +
        "  JSCompiler_inline_result$jscomp$0 = 3;" +
        "}" +
        "var x = {y: 1, z: JSCompiler_inline_result$jscomp$0};");
  }

  @Test
  public void testInlineFunctions28() {
    test("var window = {}; function foo(){window.bar++; return 3;}" +
        "var x = {y: alert(), z: foo(2)};",
        "var window = {};" +
        "var JSCompiler_temp_const$jscomp$0 = alert();" +
        "var JSCompiler_inline_result$jscomp$1;" +
        "{" +
        " window.bar++;" +
        " JSCompiler_inline_result$jscomp$1 = 3;}" +
        "var x = {" +
        "  y: JSCompiler_temp_const$jscomp$0," +
        "  z: JSCompiler_inline_result$jscomp$1" +
        "};");
  }

  @Test
  public void testInlineFunctions29() {
    test("var window = {}; function foo(){window.bar++; return 3;}" +
        "var x = {a: alert(), b: alert2(), c: foo(2)};",
        "var window = {};" +
        "var JSCompiler_temp_const$jscomp$1 = alert();" +
        "var JSCompiler_temp_const$jscomp$0 = alert2();" +
        "var JSCompiler_inline_result$jscomp$2;" +
        "{" +
        " window.bar++;" +
        " JSCompiler_inline_result$jscomp$2 = 3;}" +
        "var x = {" +
        "  a: JSCompiler_temp_const$jscomp$1," +
        "  b: JSCompiler_temp_const$jscomp$0," +
        "  c: JSCompiler_inline_result$jscomp$2" +
        "};");
  }

  @Test
  public void testInlineFunctions30() {
    // As simple a test as we can get.
    testSame("function foo(){ return eval() } foo();");
  }

  @Test
  public void testInlineFunctions31() {
    // Don't introduce a duplicate label in the same scope
    test(
        "function foo(){ lab:{4;} } lab:{foo();}",
        "lab:{{JSCompiler_inline_label_0:{4}}}");
  }

  @Test
  public void testInlineFunctions32() {
    test(
        "let f = function() { return 5; }; f();",
        "5;");
  }

  @Test
  public void testInlineFunctions33() {
    test(
        "const f = function() { return 5; }; f();",
        "5;");
  }

  @Test
  public void testInlineFunctions34() {
    test(
        lines(
            "class X {}",
            "(function(e) {",
            "  for (var el = f(e.target); el != null; el = el.parent) {}",
            "  function f(x) { return x instanceof X ? x : null; }",
            "})({target:{}});",
            ""),
        lines(
            "class X {}",
            "{",
            "  var e$jscomp$inline_0 = {target:{}};",
            "  var el$jscomp$inline_1;",
            "  {",
            "    var x$jscomp$inline_2 = e$jscomp$inline_0.target;",
            "    el$jscomp$inline_1 = x$jscomp$inline_2 instanceof X ? x$jscomp$inline_2 : null;",
            "  }",
            "  for(;el$jscomp$inline_1 != null; el$jscomp$inline_1 = el$jscomp$inline_1.parent);",
            "}",
            ""));
  }

  // Same as above, except the for loop uses a let instead of a var. See b/73373371.
  @Test
  public void testInlineFunctions35() {
    test(
        lines(
            "class X {}",
            "(function(e) {",
            "  for (let el = f(e.target); el != null; el = el.parent) {}",
            "  function f(x) { return x instanceof X ? x : null; }",
            "})({target:{}});",
            ""),
        lines(
            "class X {}",
            "{",
            "  var e$jscomp$inline_0 = {target: {}};",
            "  var JSCompiler_inline_result$jscomp$inline_1;",
            "  {",
            "    var x$jscomp$inline_2 = e$jscomp$inline_0.target;",
            "    JSCompiler_inline_result$jscomp$inline_1 =",
            "        x$jscomp$inline_2 instanceof X ? x$jscomp$inline_2 : null",
            "  }",
            "  for (let el$jscomp$inline_3 = JSCompiler_inline_result$jscomp$inline_1;",
            "       el$jscomp$inline_3 != null;",
            "       el$jscomp$inline_3 = el$jscomp$inline_3.parent) {}",
            "}",
            ""));
  }

  @Test
  public void testDontInlineFunctionsWithDirectArgumentsReferences() {
    testSame("function foo() { return arguments[0]; } foo(1);");
  }

  @Test
  public void testDontInlineFunctionsWithArgumentsReferencesInArrowFunction() {
    testSame("function foo() { return () => arguments[0]; } foo(1);");
  }

  @Test
  public void testDoInlineFunctionsWithArgumentsReferencesInInnerVanillaFunction() {
    test(
        "function foo() { return function() { return arguments[0]; } } foo(1);",
        "(function() { return arguments[0]; })");
  }

  @Test
  public void testMixedModeInlining1() {
    // Base line tests, direct inlining
    test("function foo(){return 1}" +
        "foo();",
        "1;");
  }

  @Test
  public void testMixedModeInlining2() {
    // Base line tests, block inlining. Block inlining is needed by possible-side-effect parameter.
    test(
        "function foo(){return 1} foo(x());",
        "{var JSCompiler_inline_anon_param_0=x();1}");
  }

  @Test
  public void testMixedModeInlining3() {
    // Inline using both modes.
    test(
        "function foo(){return 1} foo();foo(x());",
        "1;{var JSCompiler_inline_anon_param_0=x();1}");
  }

  @Test
  public void testMixedModeInlining4() {
    // Inline using both modes. Alternating. Second call of each type has
    // side-effect-less parameter, this is thrown away.
    test(
        "function foo(){return 1} foo(); foo(x()); foo(1);foo(1,x());",
        lines(
            "1;",
            "{var JSCompiler_inline_anon_param_0=x();1}",
            "1;",
            "{var JSCompiler_inline_anon_param_4=x();1}"));
  }

  @Test
  public void testMixedModeInliningCosting1() {
    // Inline using both modes. Costing estimates.

    // Base line.
    test(
        "function foo(a,b){return a+b+a+b+4+5+6+7+8+9+1+2+3+4+5}" +
        "foo(1,2);" +
        "foo(2,3)",

        "1+2+1+2+4+5+6+7+8+9+1+2+3+4+5;" +
        "2+3+2+3+4+5+6+7+8+9+1+2+3+4+5");
  }

  @Test
  public void testMixedModeInliningCosting2() {
    // Don't inline here because the function definition can not be eliminated.
    // TODO(johnlenz): Should we add constant removing to the unit test?
    testSame(
        "function foo(a,b){return a+b+a+b+4+5+6+7+8+9+1+2+3+4+5}" +
        "foo(1,2);" +
        "foo(2,3,x())");
  }

  @Test
  public void testMixedModeInliningCosting3() {
    // Do inline here because the function definition can be eliminated.
    test(
        lines(
            "function foo(a,b){return a+b+a+b+4+5+6+7+8+9+1+2+3+10}",
            "foo(1,2);",
            "foo(2,3,x());"),
        lines(
            "1+2+1+2+4+5+6+7+8+9+1+2+3+10;",
            "{",
            "  var JSCompiler_inline_anon_param_2 = x();",
            "  2+3+2+3+4+5+6+7+8+9+1+2+3+10;",
            "}"));
  }

  @Test
  public void testMixedModeInliningCosting4() {
    // Threshold test.
    testSame(
        "function foo(a,b){return a+b+a+b+4+5+6+7+8+9+1+2+3+4+101}" +
        "foo(1,2);" +
        "foo(2,3,x())");
  }

  /** See b/72513540 */
  @Test
  public void testDestructuringAssignInFunction() {
    test(
        lines(
            "function foo(a) {",
            "  [a] = [1];",
            "}",
            "foo(2);"),
        lines(
            "{",
            "  var a$jscomp$inline_0 = 2;",
            "  [a$jscomp$inline_0] = [1];",
            "}"));
  }

  @Test
  public void testNoInlineIfParametersModified1() {
    // Assignment
    test("function f(x){return x=1}f(undefined)",
         "{var x$jscomp$inline_0=undefined;" +
         "x$jscomp$inline_0=1}");
  }

  @Test
  public void testNoInlineIfParametersModified2() {
    test("function f(x){return (x)=1;}f(2)",
         "{var x$jscomp$inline_0=2;" +
         "x$jscomp$inline_0=1}");
  }

  @Test
  public void testNoInlineIfParametersModified3() {
    // Assignment variant.
    test("function f(x){return x*=2}f(2)",
         "{var x$jscomp$inline_0=2;" +
         "x$jscomp$inline_0*=2}");
  }

  @Test
  public void testNoInlineIfParametersModified4() {
    // Assignment in if.
    test("function f(x){return x?(x=2):0}f(2)",
         "{var x$jscomp$inline_0=2;" +
         "x$jscomp$inline_0?(" +
         "x$jscomp$inline_0=2):0}");
  }

  @Test
  public void testNoInlineIfParametersModified5() {
    // Assignment in if, multiple params
    test("function f(x,y){return x?(y=2):0}f(2,undefined)",
         "{var y$jscomp$inline_1=undefined;2?(" +
         "y$jscomp$inline_1=2):0}");
  }

  @Test
  public void testNoInlineIfParametersModified6() {
    test("function f(x,y){return x?(y=2):0}f(2)",
         "{var y$jscomp$inline_1=void 0;2?(" +
         "y$jscomp$inline_1=2):0}");
  }

  @Test
  public void testNoInlineIfParametersModified7() {
    // Increment
    test("function f(a){return++a<++a}f(1)",
         "{var a$jscomp$inline_0=1;" +
         "++a$jscomp$inline_0<" +
         "++a$jscomp$inline_0}");
  }

  @Test
  public void testInlineIfParametersModified8() {
    // OK, object parameter modified.
    test("function f(a){return a.x=2}f(o)", "o.x=2");
  }

  @Test
  public void testInlineIfParametersModified9() {
    // OK, array parameter modified.
    test("function f(a){return a[2]=2}f(o)", "o[2]=2");
  }

  @Test
  public void testInlineNeverPartialSubtitution1() {
    test("function f(z){return x.y.z;}f(1)",
         "x.y.z");
  }

  @Test
  public void testInlineNeverPartialSubtitution2() {
    test("function f(z){return x.y[z];}f(a)",
         "x.y[a]");
  }

  @Test
  public void testInlineNeverMutateConstants() {
    test("function f(x){return x=1}f(undefined)",
         "{var x$jscomp$inline_0=undefined;" +
         "x$jscomp$inline_0=1}");
  }

  @Test
  public void testInlineNeverOverrideNewValues() {
    test("function f(a){return++a<++a}f(1)",
        "{var a$jscomp$inline_0=1;" +
        "++a$jscomp$inline_0<++a$jscomp$inline_0}");
  }

  @Test
  public void testInlineMutableArgsReferencedOnce() {
    test(
        "function foo(x){return x;}foo([])",
        "[]");
  }

  @Test
  public void testInlineMutableArgsReferencedOnce2() {
    this.assumeMinimumCapture = true;
    // Don't inline a mutable value that will be reused.
    test(
        "function foo(x){return function(){ return x; }} repeat(foo([]))",
        "var JSCompiler_inline_result$jscomp$0;" +
        "{ " +
        "var x$jscomp$inline_1=[];" +
        "JSCompiler_inline_result$jscomp$0=function(){return x$jscomp$inline_1}; " +
        "}" +
        "repeat(JSCompiler_inline_result$jscomp$0)");
  }

  @Test
  public void testInlineMutableArgsReferencedOnce3() {
    this.assumeMinimumCapture = true;
    // Don't inline a mutable value that will be reused.
    test(
        lines(
            "function f(a) {",
            "  for(var i=0; i<0; i++) {",
            "    g(a);",
            "  }",
            "}",
            "f([]);"),
        lines(
            "{",
            "  var a$jscomp$inline_0 = [];",
            "  var i$jscomp$inline_1 = 0;",
            "  for(; i$jscomp$inline_1 < 0; i$jscomp$inline_1++) {",
            "    g(a$jscomp$inline_0)",
            "  }",
            "}"));
  }

  @Test
  public void testInlineBlockMutableArgs1() {
    test("function foo(x){x+x}foo([])",
         "{var x$jscomp$inline_0=[];" +
         "x$jscomp$inline_0+x$jscomp$inline_0}");
  }

  @Test
  public void testInlineBlockMutableArgs2() {
    test("function foo(x){x+x}foo(new Date)",
         "{var x$jscomp$inline_0=new Date;" +
         "x$jscomp$inline_0+x$jscomp$inline_0}");
  }

  @Test
  public void testInlineBlockMutableArgs3() {
    test("function foo(x){x+x}foo(true&&new Date)",
         "{var x$jscomp$inline_0=true&&new Date;" +
         "x$jscomp$inline_0+x$jscomp$inline_0}");
  }

  @Test
  public void testInlineBlockMutableArgs4() {
    test("function foo(x){x+x}foo({})",
         "{var x$jscomp$inline_0={};" +
         "x$jscomp$inline_0+x$jscomp$inline_0}");
  }

  @Test
  public void testShadowVariables1() {
    // The Normalize pass now guarantees that that globals are never shadowed
    // by locals.

    // "foo" is inlined here as its parameter "a" doesn't conflict.
    // "bar" is assigned a new name.
    test(
        lines(
            "var a = 0;",
            "function foo(a) { return 3+a; }",
            "function bar() { var a = foo(4); }",
            "bar();"),
        "var a=0; {var a$jscomp$inline_0 = 3+4; }");
  }

  @Test
  public void testShadowVariables2() {
    // "foo" is inlined here as its parameter "a" doesn't conflict.
    // "bar" is inlined as its uses global "a", and does introduce any new
    // globals.
    test("var a=0;" +
        "function foo(a){return 3+a}" +
        "function bar(){a=foo(4)}" +
        "bar()",

        "var a=0;" +
        "{a=3+4}");
  }

  @Test
  public void testShadowVariables3() {
    // "foo" is inlined into exported "_bar", aliasing foo's "a".
    test(
        lines(
            "var a = 0;",
            "function foo() { var a = 2; return 3+a; }",
            "function _bar() { a = foo(); }"),
        lines(
            "var a=0;",
            "function _bar() {",
            "  {",
            "     var a$jscomp$inline_0 = 2;",
            "     a = 3 + a$jscomp$inline_0;",
            "  }",
            "}"));
  }

  @Test
  public void testShadowVariables4() {
    // "foo" is inlined.
    // block access to global "a".
    test("var a=0;" +
         "function foo(){return 3+a}" +
         "function _bar(a){a=foo(4)+a}",

         "var a=0;function _bar(a$jscomp$1){" +
         "a$jscomp$1=" +
         "3+a+a$jscomp$1}");
  }

  @Test
  public void testShadowVariables6() {
    test(
        lines(
            "var a=0;",
            "function foo() { var a = 4; return 3+a; }",
            "function _bar(a) { a = foo(4); }"),
        lines(
            "var a=0;",
            "function _bar(a$jscomp$2) {",
            "  {",
            "    var a$jscomp$inline_0 = 4;",
            "    a$jscomp$2 = 3 + a$jscomp$inline_0;",
            "  }",
            "}"));
  }

  @Test
  public void testShadowVariables7() {
    assumeMinimumCapture = false;
    test("var a=3;" +
         "function foo(){return a}" +
         "(function(){var a=5;(function(){foo()})()})()",
         "var a=3;" +
         "{var a$jscomp$inline_0=5;{a}}"
         );

    assumeMinimumCapture = true;
    test("var a=3;" +
         "function foo(){return a}" +
         "(function(){var a=5;(function(){foo()})()})()",
         "var a=3;" +
         "{var a$jscomp$inline_1=5;{a}}"
         );
  }

  @Test
  public void testShadowVariables8() {
    // this should be inlined
    test("var a=0;" +
         "function foo(){return 3}" +
         "function _bar(){var a=foo()}",

         "var a=0;" +
         "function _bar(){var a=3}");
  }

  @Test
  public void testShadowVariables9() {
    // this should be inlined too [even if the global is not declared]
    test("function foo(){return 3}" +
         "function _bar(){var a=foo()}",

         "function _bar(){var a=3}");
  }

  @Test
  public void testShadowVariables10() {
    // callee var must be renamed.
    test("var a;function foo(){return a}" +
         "function _bar(){var a=foo()}",
         "var a;function _bar(){var a$jscomp$1=a}");
  }

  @Test
  public void testShadowVariables11() {
    // The call has a local variable
    // which collides with the function being inlined
    test("var a=0;var b=1;" +
         "function foo(){return a+a}" +
         "function _bar(){var a=foo();alert(a)}",
         "var a=0;var b=1;" +
         "function _bar(){var a$jscomp$1=a+a;" +
         "alert(a$jscomp$1)}"
         );
  }

  @Test
  public void testShadowVariables12() {
    // 2 globals colliding
    test("var a=0;var b=1;" +
         "function foo(){return a+b}" +
         "function _bar(){var a=foo(),b;alert(a)}",
         "var a=0;var b=1;" +
         "function _bar(){var a$jscomp$1=a+b," +
         "b$jscomp$1;" +
         "alert(a$jscomp$1)}");
  }

  @Test
  public void testShadowVariables13() {
    // The only change is to remove the collision
    test("var a=0;var b=1;" +
         "function foo(){return a+a}" +
         "function _bar(){var c=foo();alert(c)}",

         "var a=0;var b=1;" +
         "function _bar(){var c=a+a;alert(c)}");
  }

  @Test
  public void testShadowVariables14() {
    // There is a collision even though it is not read.
    test("var a=0;var b=1;" +
         "function foo(){return a+b}" +
         "function _bar(){var c=foo(),b;alert(c)}",
         "var a=0;var b=1;" +
         "function _bar(){var c=a+b," +
         "b$jscomp$1;alert(c)}");
  }

  @Test
  public void testShadowVariables15() {
    // Both parent and child reference a global
    test("var a=0;var b=1;" +
         "function foo(){return a+a}" +
         "function _bar(){var c=foo();alert(c+a)}",

         "var a=0;var b=1;" +
         "function _bar(){var c=a+a;alert(c+a)}");
  }

  @Test
  public void testShadowVariables16() {
    assumeMinimumCapture = false;
    // Inline functions defined as a child of the CALL node.
    test("var a=3;" +
         "function foo(){return a}" +
         "(function(){var a=5;(function(){foo()})()})()",
         "var a=3;" +
         "{var a$jscomp$inline_0=5;{a}}"
         );

    assumeMinimumCapture = true;
    // Inline functions defined as a child of the CALL node.
    test("var a=3;" +
         "function foo(){return a}" +
         "(function(){var a=5;(function(){foo()})()})()",
         "var a=3;" +
         "{var a$jscomp$inline_1=5;{a}}"
         );

  }

  @Test
  public void testShadowVariables17() {
    test("var a=0;" +
         "function bar(){return a+a}" +
         "function foo(){return bar()}" +
         "function _goo(){var a=2;var x=foo();}",

         "var a=0;" +
         "function _goo(){var a$jscomp$1=2;var x=a+a}");
  }

  @Test
  public void testShadowVariables18() {
    test(
        lines(
            "var a=0;",
            "function bar() { return a + a; }",
            "function foo() { var a=3; return bar(); }",
            "function _goo() { var a=2; var x = foo(); }"),
        lines(
            "var a=0;",
            "function _goo(){",
            "  var a$jscomp$2 = 2;",
            "  var x;",
            "  {",
            "    var a$jscomp$inline_0 = 3;",
            "    x = a + a;",
            "  }",
            "}"));
  }

  @Test
  public void testShadowVariables19() {
    test(
        lines(
            "let a = 0;",
            "function bar() { return a + a; }",
            "function foo() { let a = 3; return bar(); }",
            "function _goo() { let a = 2; let x = foo(); }"),
        lines(
            "let a = 0;",
            "function _goo() {",
            "  let a$jscomp$2 = 2;",
            "  var JSCompiler_inline_result$jscomp$0;",
            "  {",
            "     let a$jscomp$inline_1 = 3;",
            "     JSCompiler_inline_result$jscomp$0 = a + a;",
            "  }",
            "  let x = JSCompiler_inline_result$jscomp$0;",
            "}"));
  }

  @Test
  public void testShadowVariables20() {
    test(
        lines(
            "const a = 0;",
            "function bar() { return a + a; }",
            "function foo() { const a = 3; return bar(); }",
            "function _goo() { const a = 2; const x = foo(); }"),
        lines(
            "const a = 0;",
            "function _goo() {",
            "  const a$jscomp$2 = 2;",
            "  var JSCompiler_inline_result$jscomp$0;",
            "  {",
            "    const a$jscomp$inline_1 = 3;",
            "    JSCompiler_inline_result$jscomp$0 = a + a;",
            "  }",
            "  const x = JSCompiler_inline_result$jscomp$0;",
            "}"));
  }

  @Test
  public void testCostBasedInlining1() {
    testSame(
        "function foo(a){return a}" +
        "foo=new Function(\"return 1\");" +
        "foo(1)");
  }

  @Test
  public void testCostBasedInlining2() {
    // Baseline complexity tests.
    // Single call, function not removed.
    test(
        "function foo(a){return a}" +
        "var b=foo;" +
        "function _t1(){return foo(1)}",

        "function foo(a){return a}" +
        "var b=foo;" +
        "function _t1(){return 1}");
  }

  @Test
  public void testCostBasedInlining3() {
    // Two calls, function not removed.
    test(
        "function foo(a,b){return a+b}" +
        "var b=foo;" +
        "function _t1(){return foo(1,2)}" +
        "function _t2(){return foo(2,3)}",

        "function foo(a,b){return a+b}" +
        "var b=foo;" +
        "function _t1(){return 1+2}" +
        "function _t2(){return 2+3}");
  }

  @Test
  public void testCostBasedInlining4() {
    // Two calls, function not removed.
    // Here there isn't enough savings to justify inlining.
    testSame(
        "function foo(a,b){return a+b+a+b}" +
        "var b=foo;" +
        "function _t1(){return foo(1,2)}" +
        "function _t2(){return foo(2,3)}");
  }

  @Test
  public void testCostBasedInlining5() {
    // Here there is enough savings to justify inlining.
    test(
        "function foo(a,b){return a+b+a+b}" +
        "function _t1(){return foo(1,2)}" +
        "function _t2(){return foo(2,3)}",

        "function _t1(){return 1+2+1+2}" +
        "function _t2(){return 2+3+2+3}");
  }

  @Test
  public void testCostBasedInlining6() {
    // Here we have a threshold test.
    // Do inline here:
    test(
        "function foo(a,b){return a+b+a+b+a+b+a+b+4+5+6+7+8+9+1+2+3+4+5}" +
        "function _t1(){return foo(1,2)}" +
        "function _t2(){return foo(2,3)}",

        "function _t1(){return 1+2+1+2+1+2+1+2+4+5+6+7+8+9+1+2+3+4+5}" +
        "function _t2(){return 2+3+2+3+2+3+2+3+4+5+6+7+8+9+1+2+3+4+5}");
  }

  @Test
  public void testCostBasedInlining7() {
    // Don't inline here (not enough savings):
    testSame(
        "function foo(a,b){" +
        "    return a+b+a+b+a+b+a+b+4+5+6+7+8+9+1+2+3+4+5+6}" +
        "function _t1(){return foo(1,2)}" +
        "function _t2(){return foo(2,3)}");
  }

  @Test
  public void testCostBasedInlining9() {
    // Here both direct and block inlining is used.  The call to f as a
    // parameter is inlined directly, which the call to f with f as a parameter
    // is inlined using block inlining.
    test("function f(a){return chg() + a + a;}" +
         "var a = f(f(1));",
         "var a;" +
         "{var a$jscomp$inline_0=chg()+1+1;" +
         "a=chg()+a$jscomp$inline_0+a$jscomp$inline_0}");
  }

  @Test
  public void testCostBasedInlining11() {
    // With block inlining
    test("function f(a){return chg() + a + a;}" +
         "var a = f(f(1))",
         "var a;" +
         "{var a$jscomp$inline_0=chg()+1+1;" +
         "a=chg()+a$jscomp$inline_0+a$jscomp$inline_0}");
  }

  @Test
  public void testCostBasedInlining12() {
    test("function f(a){return 1 + a + a;}" +
         "var a = f(1) + f(2);",

         "var a=1+1+1+(1+2+2)");
  }

  @Test
  public void testCostBasedInlineForSimpleFunction() {
    int calls = 100;
    String src = "function f(a){return a;}\n";
    for (int i = 0; i < calls; i++) {
      src += "f(chg());\n";
    }
    String expected = "";
    for (int i = 0; i < calls; i++) {
      expected += "chg();\n";
    }
    test(src, expected);
  }

  @Test
  public void testCostBasedInliningComplex1() {
    testSame(
        "function foo(a){a()}" +
        "foo=new Function(\"return 1\");" +
        "foo(1)");
  }

  @Test
  public void testCostBasedInliningComplex2() {
    // Baseline complexity tests.
    // Single call, function not removed.
    test(
        "function foo(a){a()}" +
        "var b=foo;" +
        "function _t1(){foo(x)}",

        "function foo(a){a()}" +
        "var b=foo;" +
        "function _t1(){{x()}}");
  }

  @Test
  public void testCostBasedInliningComplex3() {
    // Two calls, function not removed.
    test(
        "function foo(a,b){a+b}" +
        "var b=foo;" +
        "function _t1(){foo(1,2)}" +
        "function _t2(){foo(2,3)}",

        "function foo(a,b){a+b}" +
        "var b=foo;" +
        "function _t1(){{1+2}}" +
        "function _t2(){{2+3}}");
  }

  @Test
  public void testCostBasedInliningComplex4() {
    // Two calls, function not removed.
    // Here there isn't enough savings to justify inlining.
    testSame(
        "function foo(a,b){a+b+a+b}" +
        "var b=foo;" +
        "function _t1(){foo(1,2)}" +
        "function _t2(){foo(2,3)}");
  }

  @Test
  public void testCostBasedInliningComplex5() {
    // Here there is enough savings to justify inlining.
    test(
        "function foo(a,b){a+b+a+b}" +
        "function _t1(){foo(1,2)}" +
        "function _t2(){foo(2,3)}",

        "function _t1(){{1+2+1+2}}" +
        "function _t2(){{2+3+2+3}}");
  }

  @Test
  public void testCostBasedInliningComplex6() {
    // Here we have a threshold test.
    // Do inline here:
    test(
        "function foo(a,b){a+b+a+b+a+b+a+b+4+5+6+7+8+9+1}" +
        "function _t1(){foo(1,2)}" +
        "function _t2(){foo(2,3)}",

        "function _t1(){{1+2+1+2+1+2+1+2+4+5+6+7+8+9+1}}" +
        "function _t2(){{2+3+2+3+2+3+2+3+4+5+6+7+8+9+1}}");
  }

  @Test
  public void testCostBasedInliningComplex7() {
    // Don't inline here (not enough savings):
    testSame(
        "function foo(a,b){a+b+a+b+a+b+a+b+4+5+6+7+8+9+1+2}" +
        "function _t1(){foo(1,2)}" +
        "function _t2(){foo(2,3)}");
  }

  @Test
  public void testCostBasedInliningComplex8() {
    // Verify multiple references in the same statement.
    testSame("function _f(a){1+a+a}" +
             "a=_f(1)+_f(1)");
  }

  @Test
  public void testCostBasedInliningComplex9() {
    test("function f(a){1 + a + a;}" +
         "f(1);f(2);",
         "{1+1+1}{1+2+2}");
  }

  @Test
  public void testDoubleInlining2() {
    test("var foo = function(a) { return getWindow(a); };" +
         "var bar = function(b) { return b; };" +
         "foo(bar(x));",
         "getWindow(x)");
  }

  @Test
  public void testNoInlineOfNonGlobalFunction1() {
    test("var g;function _f(){function g(){return 0}}" +
         "function _h(){return g()}",
         "var g;function _f(){}" +
         "function _h(){return g()}");
  }

  @Test
  public void testNoInlineOfNonGlobalFunction2() {
    test(
        lines(
            "var g;",
            "function _f() { var g = function() { return 0; }; }",
            "function _h() { return g(); }"),
        lines(
             "var g;",
             "function _f(){}",
             "function _h(){ return g(); }"));
  }

  @Test
  public void testNoInlineOfNonGlobalFunction3() {
    test("var g;function _f(){var g=function(){return 0}}" +
         "function _h(){return g()}",
         "var g;function _f(){}" +
         "function _h(){return g()}");
  }

  @Test
  public void testNoInlineOfNonGlobalFunction4() {
    test("var g;function _f(){function g(){return 0}}" +
         "function _h(){return g()}",
         "var g;function _f(){}" +
         "function _h(){return g()}");

  }

  @Test
  public void testNoInlineMaskedFunction() {
    // Normalization makes this test of marginal value.
    // The unreferenced function is removed.
    test("var g=function(){return 0};" +
         "function _f(g){return g()}",
         "function _f(g$jscomp$1){return g$jscomp$1()}");
  }

  @Test
  public void testNoInlineNonFunction() {
    testSame("var g=3;function _f(){return g()}");
  }

  @Test
  public void testInlineCall() {
    test("function f(g) { return g.h(); } f('x');",
         "\"x\".h()");
  }

  @Test
  public void testInlineFunctionWithArgsMismatch1() {
    test("function f(g) { return g; } f();",
         "void 0");
  }

  @Test
  public void testInlineFunctionWithArgsMismatch2() {
    test("function f() { return 0; } f(1);",
         "0");
  }

  @Test
  public void testInlineFunctionWithArgsMismatch3() {
    test("function f(one, two, three) { return one + two + three; } f(1);",
         "1+void 0+void 0");
  }

  @Test
  public void testInlineFunctionWithArgsMismatch4() {
    test("function f(one, two, three) { return one + two + three; }" +
         "f(1,2,3,4,5);",
         "1+2+3");
  }

  @Test
  public void testComplexInlineNoResultNoParamCall1() {
    test("function f(){a()}f()",
         "{a()}");
  }

  @Test
  public void testComplexInlineNoResultNoParamCall2() {
    test(
        "function f() { if (true) { return; } else; } f();",
        "{JSCompiler_inline_label_f_0:{ if(true)break JSCompiler_inline_label_f_0;else; } }");
  }

  @Test
  public void testComplexInlineNoResultNoParamCall3() {
    // We now allow vars in the global space.
    //   Don't inline into vars into global scope.
    //   testSame("function f(){a();b();var z=1+1}f()");

    // But do inline into functions
    test("function f(){a();b();var z=1+1}function _foo(){f()}",
         "function _foo(){{a();b();var z$jscomp$inline_0=1+1}}");

  }

  @Test
  public void testComplexInlineNoResultWithParamCall1() {
    test("function f(x){a(x)}f(1)",
         "{a(1)}");
  }

  @Test
  public void testComplexInlineNoResultWithParamCall2() {
    test("function f(x,y){a(x)}var b=1;f(1,b)",
         "var b=1;{a(1)}");
  }

  @Test
  public void testComplexInlineNoResultWithParamCall3() {
    test("function f(x,y){if (x) y(); return true;}var b=1;f(1,b)",
         "var b=1;{if(1)b();true}");
  }

  @Test
  public void testComplexInline1() {
    test(
        "function f(){if (true){return;}else;} z=f();",
        lines(
            "{",
            "  JSCompiler_inline_label_f_0: {",
            "    if (true) {",
            "      z = void 0;",
            "      break JSCompiler_inline_label_f_0;",
            "    }else;",
            "    z = void 0;",
            "  }",
            "}"));
  }

  @Test
  public void testComplexInline2() {
    test(
        "function f(){if (true){return;}else return;} z=f();",
        lines(
            "{",
            "  JSCompiler_inline_label_f_0: {",
            "    if(true) {",
            "      z = void 0;",
            "      break JSCompiler_inline_label_f_0;",
            "    } else {",
            "      z=void 0;",
            "      break JSCompiler_inline_label_f_0;",
            "    }",
            "    z=void 0;",
            "  }",
            "}"));
  }

  @Test
  public void testComplexInline3() {
    test(
        "function f(){if (true){return 1;}else return 0;} z=f();",
        lines(
            "{",
            "JSCompiler_inline_label_f_0:{",
            "if(true){z=1;",
            "break JSCompiler_inline_label_f_0;",
            "} else {",
            "z=0;",
            "break JSCompiler_inline_label_f_0;}",
            "z = void 0",
            "}",
            "}"));
  }

  @Test
  public void testComplexInline4() {
    test("function f(x){a(x)} z = f(1)",
         "{a(1);z=void 0}");
  }

  @Test
  public void testComplexInline5() {
    test("function f(x,y){a(x)}var b=1;z=f(1,b)",
         "var b=1;{a(1);z=void 0}");
  }

  @Test
  public void testComplexInline6() {
    test("function f(x,y){if (x) y(); return true;}var b=1;z=f(1,b)",
         "var b=1;{if(1)b();z=true}");
  }

  @Test
  public void testComplexInline7() {
    test(
        "function f(x,y){if (x) return y(); else return true;} var b=1;z=f(1,b)",
        lines(
            "var b=1;",
            "{",
            "  JSCompiler_inline_label_f_2: {",
            "    if(1) {",
            "      z = b();",
            "      break JSCompiler_inline_label_f_2;",
            "    } else {",
            "      z = true;",
            "      break JSCompiler_inline_label_f_2",
            "    }",
            "    z = void 0;",
            "  }",
            "}"));
  }

  @Test
  public void testComplexInline8() {
    test("function f(x){a(x)}var z=f(1)",
         "var z;{a(1);z=void 0}");
  }

  @Test
  public void testInlineIntoLoopWithUninitializedVars1() {
    test(
        lines(
            "function f(){var x;if (true){x=7} return x;}",
            "for(;;) {f();}"),
        lines(
            "for(;;) {",
            "  {",
            "    var x$jscomp$inline_0 = void 0;",
            "    if (true) { x$jscomp$inline_0 = 7; }",
            "    x$jscomp$inline_0;",
            "  }",
            "}"));
  }

  @Test
  public void testInlineIntoLoopWithUninitializedVars2() {
    test(
        lines(
            "function f(){x = x||1; var x; return x;}",
            "for(;;) {f();}"),
        lines(
            "for(;;) {",
            "  {",
            "    var x$jscomp$inline_0 = void 0;",
            "    x$jscomp$inline_0 = x$jscomp$inline_0 || 1;",
            "    x$jscomp$inline_0;",
            "  }",
            "}"));
  }

  @Test
  public void testComplexInlineVars1() {
    test(
        "function f() { if (true) { return; } else; } var z = f();",
        lines(
            "var z;",
            "{",
            "  JSCompiler_inline_label_f_0:{",
            "    if(true) {",
            "      z = void 0;",
            "      break JSCompiler_inline_label_f_0;",
            "    } else;",
            "    z = void 0;",
            "  }",
            "}"));
  }

  @Test
  public void testComplexInlineVars2() {
    test(
        "function f(){if (true){return;}else return;}var z=f();",
        lines(
            "var z;",
            "{",
            "  JSCompiler_inline_label_f_0:{",
            "    if (true) {",
            "      z = void 0;",
            "      break JSCompiler_inline_label_f_0;",
            "    } else {",
            "      z = void 0;",
            "      break JSCompiler_inline_label_f_0;",
            "    }",
            "    z=void 0;",
            "  }",
            "}"));
  }

  @Test
  public void testComplexInlineVars3() {
    test(
        "function f(){if (true){return 1;}else return 0;}var z=f();",
        lines(
            "var z;",
            "{",
            "  JSCompiler_inline_label_f_0:{",
            "    if (true) {",
            "      z = 1;",
            "      break JSCompiler_inline_label_f_0;",
            "    } else {",
            "      z = 0;",
            "      break JSCompiler_inline_label_f_0;",
            "    }",
            "    z = void 0;",
            "  }",
            "}"));
  }

  @Test
  public void testComplexInlineVars4() {
    test("function f(x){a(x)}var z = f(1)",
         "var z;{a(1);z=void 0}");
  }

  @Test
  public void testComplexInlineVars5() {
    test("function f(x,y){a(x)}var b=1;var z=f(1,b)",
         "var b=1;var z;{a(1);z=void 0}");
  }

  @Test
  public void testComplexInlineVars6() {
    test("function f(x,y){if (x) y(); return true;}var b=1;var z=f(1,b)",
         "var b=1;var z;{if(1)b();z=true}");
  }

  @Test
  public void testComplexInlineVars7() {
    test(
        lines(
            "function f(x,y){if (x) return y(); else return true;}",
            "var b=1;var z=f(1,b)"),
        lines(
            "var b=1;",
            "var z;",
            "{",
            "  JSCompiler_inline_label_f_2:{",
            "    if (1) {",
            "      z = b();",
            "      break JSCompiler_inline_label_f_2;",
            "    } else {",
            "      z = true;",
            "      break JSCompiler_inline_label_f_2;",
            "    }",
            "    z = void 0;",
            "  }",
            "}"));
  }

  @Test
  public void testComplexInlineVars8() {
    test("function f(x){a(x)}var x;var z=f(1)",
         "var x;var z;{a(1);z=void 0}");
  }

  @Test
  public void testComplexInlineVars9() {
    test("function f(x){a(x)}var x;var z=f(1);var y",
         "var x;var z;{a(1);z=void 0}var y");
  }

  @Test
  public void testComplexInlineVars10() {
    test("function f(x){a(x)}var x=blah();var z=f(1);var y=blah();",
          "var x=blah();var z;{a(1);z=void 0}var y=blah()");
  }

  @Test
  public void testComplexInlineVars11() {
    test("function f(x){a(x)}var x=blah();var z=f(1);var y;",
         "var x=blah();var z;{a(1);z=void 0}var y");
  }

  @Test
  public void testComplexInlineVars12() {
    test("function f(x){a(x)}var x;var z=f(1);var y=blah();",
         "var x;var z;{a(1);z=void 0}var y=blah()");
  }

  @Test
  public void testComplexInlineInExpressionss1() {
    test("function f(){a()}var z=f()",
         "var z;{a();z=void 0}");
  }

  @Test
  public void testComplexInlineInExpressionss2() {
    test("function f(){a()}c=z=f()",
         "var JSCompiler_inline_result$jscomp$0;" +
         "{a();JSCompiler_inline_result$jscomp$0=void 0;}" +
         "c=z=JSCompiler_inline_result$jscomp$0");
  }

  @Test
  public void testComplexInlineInExpressionss3() {
    test("function f(){a()}c=z=f()",
        "var JSCompiler_inline_result$jscomp$0;" +
        "{a();JSCompiler_inline_result$jscomp$0=void 0;}" +
        "c=z=JSCompiler_inline_result$jscomp$0");
  }

  @Test
  public void testComplexInlineInExpressionss4() {
    test("function f(){a()}if(z=f());",
        "var JSCompiler_inline_result$jscomp$0;" +
        "{a();JSCompiler_inline_result$jscomp$0=void 0;}" +
        "if(z=JSCompiler_inline_result$jscomp$0);");
  }

  @Test
  public void testComplexInlineInExpressionss5() {
    test("function f(){a()}if(z.y=f());",
         "var JSCompiler_temp_const$jscomp$0=z;" +
         "var JSCompiler_inline_result$jscomp$1;" +
         "{a();JSCompiler_inline_result$jscomp$1=void 0;}" +
         "if(JSCompiler_temp_const$jscomp$0.y=JSCompiler_inline_result$jscomp$1);");
  }

  @Test
  public void testComplexNoInline1() {
    testSame("function f(){a()}while(z=f())continue");
  }

  @Test
  public void testComplexNoInline2() {
    testSame("function f(){a()}do;while(z=f())");
  }

  @Test
  public void testComplexSample() {
    test(
        lines(
            "var foo = function(stylesString, opt_element) { ",
            "  var styleSheet = null;",
            "  if (goog$userAgent$IE)",
            "    styleSheet = 0;",
            "  else",
            "    var head = 0;",
            "",
            "  goo$zoo(styleSheet, stylesString);",
            "  return styleSheet;",
            "};",
            "",
            "var goo$zoo = function(element, stylesString) {",
            "  if (goog$userAgent$IE)",
            "    element.cssText = stylesString;",
            "  else {",
            "    var propToSet = 'innerText';",
            "    element[propToSet] = stylesString;",
            "  }",
            "};",
            "(function(){foo(a,b);})();"),
        lines(
            "{",
            "  {",
            "    var styleSheet$jscomp$inline_2 = null;",
            "    if (goog$userAgent$IE)",
            "      styleSheet$jscomp$inline_2 = 0;",
            "    else",
            "      var head$jscomp$inline_3 = 0;",
            "    {",
            "       var element$jscomp$inline_0 = styleSheet$jscomp$inline_2;",
            "       var stylesString$jscomp$inline_1=a;",
            "       if (goog$userAgent$IE)",
            "         element$jscomp$inline_0.cssText = stylesString$jscomp$inline_1;",
            "       else {",
            "         var propToSet$jscomp$inline_2 = 'innerText';",
            "         element$jscomp$inline_0[propToSet$jscomp$inline_2] =",
            "             stylesString$jscomp$inline_1",
            "       }",
            "    }",
            "    styleSheet$jscomp$inline_2;",
            "  }",
            "}"));
  }

  @Test
  public void testComplexSampleNoInline() {
    testSame(
        lines(
            "foo = function(stylesString, opt_element) {",
            "  var styleSheet = null;",
            "  if(goog$userAgent$IE)",
            "    styleSheet=0;",
            "  else",
            "    var head=0;",
            "",
            "  goo$zoo(styleSheet, stylesString);",
            "  return styleSheet",
            "};",
            "",
            "goo$zoo = function(element, stylesString) {",
            "  if (goog$userAgent$IE)",
            "    element.cssText = stylesString;",
            "  else{",
            "    var propToSet = goog$userAgent$WEBKIT? 'innerText' : 'innerHTML';",
            "    element[propToSet] = stylesString",
            "  }",
            "}"));
  }

  // Test redefinition of parameter name.
  @Test
  public void testComplexNoVarSub() {
    test(
        "function foo(x){" +
          "var x;" +
          "y=x" +
        "}" +
        "foo(1)",

        "{y=1}"
        );
   }

  @Test
  public void testComplexFunctionWithFunctionDefinition1() {
    test("function f(){call(function(){return})}f()",
         "{call(function(){return})}");
  }

  @Test
  public void testComplexFunctionWithFunctionDefinition2() {
    assumeMinimumCapture = false;

    // Don't inline if local names might be captured.
    testSame(
        lines(
            "function f(a) {",
            "  call(function(){return});",
            "}",
            "f();"));

    assumeMinimumCapture = true;

    test(
        lines(
            "(function() {",
            "  var f = function(a) { call(function(){return a}); };",
            "  f();",
            "})();"),
        lines(
            "{",
            "  {",
            "    var a$jscomp$inline_0 = void 0;",
            "    call(function() { return a$jscomp$inline_0; });",
            "  }",
            "}"));
  }

  @Test
  public void testComplexFunctionWithFunctionDefinition2a() {
    assumeMinimumCapture = false;

    // Don't inline if local names might be captured.
    testSame(
        lines(
            "(function() {",
            "  var f = function(a) { call(function(){return a}); };",
            "  f();",
            "})()"));

    assumeMinimumCapture = true;

    test(
        lines(
            "(function() {",
            "  var f = function(a) { call(function(){return a}); };",
            "  f();",
            "})()"),
        lines(
            "{",
            "  {",
            "    var a$jscomp$inline_0 = void 0;",
            "    call(function() { return a$jscomp$inline_0; });",
            "  }",
            "}"));
  }

  @Test
  public void testComplexFunctionWithFunctionDefinition3() {
    assumeMinimumCapture = false;

    // Don't inline if local names might need to be captured.
    testSame("function f(){var a; call(function(){return a})}f()");

    assumeMinimumCapture = true;

    test("function f(){var a; call(function(){return a})}f()",
         "{var a$jscomp$inline_0;call(function(){return a$jscomp$inline_0})}");

  }

  @Test
  public void testDecomposePlusEquals() {
    test("function f(){a=1;return 1} var x = 1; x += f()",
        "var x = 1;" +
        "var JSCompiler_temp_const$jscomp$0 = x;" +
        "var JSCompiler_inline_result$jscomp$1;" +
        "{a=1;" +
        " JSCompiler_inline_result$jscomp$1=1}" +
        "x = JSCompiler_temp_const$jscomp$0 + JSCompiler_inline_result$jscomp$1;");
  }

  @Test
  public void testDecomposeFunctionExpressionInCall() {
    test(
        "(function(map){descriptions_=map})(\n" +
           "function(){\n" +
              "var ret={};\n" +
              "ret[ONE]='a';\n" +
              "ret[TWO]='b';\n" +
              "return ret\n" +
           "}()\n" +
        ");",
        "var JSCompiler_inline_result$jscomp$0;" +
        "{" +
        "var ret$jscomp$inline_1={};\n" +
        "ret$jscomp$inline_1[ONE]='a';\n" +
        "ret$jscomp$inline_1[TWO]='b';\n" +
        "JSCompiler_inline_result$jscomp$0 = ret$jscomp$inline_1;\n" +
        "}" +
        "{" +
        "descriptions_=JSCompiler_inline_result$jscomp$0;" +
        "}"
        );
  }

  @Test
  public void testInlineConstructor1() {
    test("function f() {} function _g() {f.call(this)}",
         "function _g() {void 0}");
  }

  @Test
  public void testInlineConstructor2() {
    test("function f() {} f.prototype.a = 0; function _g() {f.call(this)}",
         "function f() {} f.prototype.a = 0; function _g() {void 0}");
  }

  @Test
  public void testInlineConstructor3() {
    test("function f() {x.call(this)} f.prototype.a = 0;" +
         "function _g() {f.call(this)}",
         "function f() {x.call(this)} f.prototype.a = 0;" +
         "function _g() {{x.call(this)}}");
  }

  @Test
  public void testInlineConstructor4() {
    test("function f() {x.call(this)} f.prototype.a = 0;" +
         "function _g() {var t = f.call(this)}",
         "function f() {x.call(this)} f.prototype.a = 0;" +
         "function _g() {var t; {x.call(this); t = void 0}}");
  }

  @Test
  public void testFunctionExpressionInlining1() {
    test("(function(){})()",
         "void 0");
  }

  @Test
  public void testFunctionExpressionInlining2() {
    test("(function(){foo()})()",
         "{foo()}");
  }

  @Test
  public void testFunctionExpressionInlining3() {
    test("var a = (function(){return foo()})()",
         "var a = foo()");
  }

  @Test
  public void testFunctionExpressionInlining4() {
    test("var a; a = 1 + (function(){return foo()})()",
         "var a; a = 1 + foo()");
  }

  @Test
  public void testFunctionExpressionCallInlining1() {
    test("(function(){}).call(this)",
         "void 0");
  }

  @Test
  public void testFunctionExpressionCallInlining2() {
    test("(function(){foo(this)}).call(this)",
         "{foo(this)}");
  }

  @Test
  public void testFunctionExpressionCallInlining3() {
    test("var a = (function(){return foo(this)}).call(this)",
         "var a = foo(this)");
  }

  @Test
  public void testFunctionExpressionCallInlining4() {
    test("var a; a = 1 + (function(){return foo(this)}).call(this)",
         "var a; a = 1 + foo(this)");
  }

  @Test
  public void testFunctionExpressionCallInlining5() {
    test("a:(function(){return foo()})()",
         "a:foo()");
  }

  @Test
  public void testFunctionExpressionCallInlining6() {
    test("a:(function(){return foo()}).call(this)",
         "a:foo()");
  }

  @Test
  public void testFunctionExpressionCallInlining7() {
    test("a:(function(){})()",
         "a:void 0");
  }

  @Test
  public void testFunctionExpressionCallInlining8() {
    test("a:(function(){}).call(this)",
         "a:void 0");
  }

  @Test
  public void testFunctionExpressionCallInlining9() {
    // ... with unused recursive name.
    test("(function foo(){})()",
         "void 0");
  }

  @Test
  public void testFunctionExpressionCallInlining10() {
    // ... with unused recursive name.
    test("(function foo(){}).call(this)",
         "void 0");
  }

  @Test
  public void testFunctionExpressionCallInlining11a() {
    // Inline functions that return inner functions.
    test("((function(){return function(){foo()}})())();", "{foo()}");
  }

  @Test
  public void testFunctionExpressionCallInlining11b() {
    assumeMinimumCapture = false;
    // Can't inline functions that return inner functions and have local names.
    testSame("((function(){var a; return function(){foo()}})())();");

    assumeMinimumCapture = true;
    test(
        "((function(){var a; return function(){foo()}})())();",

        "var JSCompiler_inline_result$jscomp$0;" +
        "{var a$jscomp$inline_1;" +
        "JSCompiler_inline_result$jscomp$0=function(){foo()};}" +
        "JSCompiler_inline_result$jscomp$0()");

  }

  @Test
  public void testFunctionExpressionCallInlining11c() {
    // TODO(johnlenz): Can inline, not temps needed.
    assumeMinimumCapture = false;
    testSame("function _x() {" +
         "  ((function(){return function(){foo()}})())();" +
         "}");

    assumeMinimumCapture = true;
    test(
        "function _x() {" +
        "  ((function(){return function(){foo()}})())();" +
        "}",
        "function _x() {" +
        "  {foo()}" +
        "}");
  }

  @Test
  public void testFunctionExpressionCallInlining11d() {
    // TODO(johnlenz): Can inline into a function containing eval, if
    // no names are introduced.
    assumeMinimumCapture = false;
    testSame("function _x() {" +
         "  eval();" +
         "  ((function(){return function(){foo()}})())();" +
         "}");

    assumeMinimumCapture = true;
    test(
        "function _x() {" +
        "  eval();" +
        "  ((function(){return function(){foo()}})())();" +
        "}",
        "function _x() {" +
        "  eval();" +
        "  {foo()}" +
        "}");

  }

  @Test
  public void testFunctionExpressionCallInlining11e() {
    // No, don't inline into a function containing eval,
    // if temps are introduced.
    assumeMinimumCapture = false;
    testSame("function _x() {" +
         "  eval();" +
         "  ((function(a){return function(){foo()}})())();" +
         "}");

    assumeMinimumCapture = true;
    test("function _x() {" +
        "  eval();" +
        "  ((function(a){return function(){foo()}})())();" +
        "}",
        "function _x() {" +
        "  eval();" +
        "  {foo();}" +
        "}");
  }

  @Test
  public void testFunctionExpressionCallInlining12() {
    // Can't inline functions that recurse.
    testSame("(function foo(){foo()})()");
  }

  @Test
  public void testFunctionExpressionOmega() {
    // ... with unused recursive name.
    test(
        "(function (f){f(f)})(function(f){f(f)})",
        lines(
            "{",
            "  var f$jscomp$inline_0 = function(f$jscomp$1) {",
            "    f$jscomp$1(f$jscomp$1);",
            "  };",
            "  {",
            "    {",
            "       f$jscomp$inline_0(f$jscomp$inline_0);",
            "    }",
            "  }",
            "}"));
  }

  @Test
  public void testLocalFunctionInlining1() {
    test("function _f(){ function g() {} g() }",
         "function _f(){ void 0 }");
  }

  @Test
  public void testLocalFunctionInlining2() {
    test("function _f(){ function g() {foo(); bar();} g() }",
         "function _f(){ {foo(); bar();} }");
  }

  @Test
  public void testLocalFunctionInlining3() {
    test("function _f(){ function g() {foo(); bar();} g() }",
         "function _f(){ {foo(); bar();} }");
  }

  @Test
  public void testLocalFunctionInlining4() {
    test("function _f(){ function g() {return 1} return g() }",
         "function _f(){ return 1 }");
  }

  @Test
  public void testLocalFunctionInlining5() {
    testSame("function _f(){ function g() {this;} g() }");
  }

  @Test
  public void testLocalFunctionInlining6() {
    testSame("function _f(){ function g() {this;} return g; }");
  }

  @Test
  public void testLocalFunctionInliningOnly1() {
    this.inliningReach = Reach.ALL;
    test("function f(){} f()", "void 0;");
    this.inliningReach = Reach.LOCAL_ONLY;
    testSame("function f(){} f()");
  }

  @Test
  public void testLocalFunctionInliningOnly2() {
    this.inliningReach = Reach.LOCAL_ONLY;
    testSame("function f(){} f()");

    test("function f(){ function g() {return 1} return g() }; f();",
         "function f(){ return 1 }; f();");
  }

  @Test
  public void testLocalFunctionInliningOnly3() {
    this.inliningReach = Reach.LOCAL_ONLY;
    testSame("function f(){} f()");

    test("(function(){ function g() {return 1} return g() })();",
         "(function(){ return 1 })();");
  }

  @Test
  public void testLocalFunctionInliningOnly4() {
    this.inliningReach = Reach.LOCAL_ONLY;
    testSame("function f(){} f()");

    test("(function(){ return (function() {return 1})() })();",
         "(function(){ return 1 })();");
  }

  @Test
  public void testInlineWithThis1() {
    assumeStrictThis = false;
    // If no "this" is provided it might need to be coerced to the global
    // "this".
    testSame("function f(){} f.call();");
    testSame("function f(){this} f.call();");

    assumeStrictThis = true;
    // In strict mode, "this" is never coerced so we can use the provided value.
    test("function f(){} f.call();", "{}");
    test("function f(){this} f.call();",
         "{void 0;}");
  }

  @Test
  public void testInlineWithThis2() {
    // "this" can always be replaced with "this"
    assumeStrictThis = false;
    test("function f(){} f.call(this);", "void 0");

    assumeStrictThis = true;
    test("function f(){} f.call(this);", "void 0");
  }

  @Test
  public void testInlineWithThis3() {
    assumeStrictThis = false;
    // If no "this" is provided it might need to be coerced to the global
    // "this".
    testSame("function f(){} f.call([]);");

    assumeStrictThis = true;
    // In strict mode, "this" is never coerced so we can use the provided value.
    test("function f(){} f.call([]);", "{}");
  }

  @Test
  public void testInlineWithThis4() {
    assumeStrictThis = false;
    // If no "this" is provided it might need to be coerced to the global
    // "this".
    testSame("function f(){} f.call(new g);");

    assumeStrictThis = true;
    // In strict mode, "this" is never coerced so we can use the provided value.
    test("function f(){} f.call(new g);",
         "{var JSCompiler_inline_this_0=new g}");
  }

  @Test
  public void testInlineWithThis5() {
    assumeStrictThis = false;
    // If no "this" is provided it might need to be coerced to the global
    // "this".
    testSame("function f(){} f.call(g());");

    assumeStrictThis = true;
    // In strict mode, "this" is never coerced so we can use the provided value.
    test("function f(){} f.call(g());",
         "{var JSCompiler_inline_this_0=g()}");
  }

  @Test
  public void testInlineWithThis6() {
    assumeStrictThis = false;
    // If no "this" is provided it might need to be coerced to the global
    // "this".
    testSame("function f(){this} f.call(new g);");

    assumeStrictThis = true;
    // In strict mode, "this" is never coerced so we can use the provided value.
    test("function f(){this} f.call(new g);",
         "{var JSCompiler_inline_this_0=new g;JSCompiler_inline_this_0}");
  }

  @Test
  public void testInlineWithThis7() {
    assumeStrictThis = true;
    // In strict mode, "this" is never coerced so we can use the provided value.
    test("function f(a){a=1;this} f.call();",
         "{var a$jscomp$inline_0=void 0; a$jscomp$inline_0=1; void 0;}");
    test("function f(a){a=1;this} f.call(x, x);",
         "{var a$jscomp$inline_0=x; a$jscomp$inline_0=1; x;}");
  }

  // http://en.wikipedia.org/wiki/Fixed_point_combinator#Y_combinator
  @Test
  public void testFunctionExpressionYCombinator() {
    assumeMinimumCapture = false;
    testSame(
        "var factorial = ((function(M) {\n" +
        "      return ((function(f) {\n" +
        "                 return M(function(arg) {\n" +
        "                            return (f(f))(arg);\n" +
        "                            })\n" +
        "               })\n" +
        "              (function(f) {\n" +
        "                 return M(function(arg) {\n" +
        "                            return (f(f))(arg);\n" +
        "                           })\n" +
        "                 }));\n" +
        "     })\n" +
        "    (function(f) {\n" +
        "       return function(n) {\n" +
        "        if (n === 0)\n" +
        "          return 1;\n" +
        "        else\n" +
        "          return n * f(n - 1);\n" +
        "       };\n" +
        "     }));\n" +
        "\n" +
        "factorial(5)\n");

    assumeMinimumCapture = true;
    test(
        "var factorial = ((function(M) {\n" +
        "      return ((function(f) {\n" +
        "                 return M(function(arg) {\n" +
        "                            return (f(f))(arg);\n" +
        "                            })\n" +
        "               })\n" +
        "              (function(f) {\n" +
        "                 return M(function(arg) {\n" +
        "                            return (f(f))(arg);\n" +
        "                           })\n" +
        "                 }));\n" +
        "     })\n" +
        "    (function(f) {\n" +
        "       return function(n) {\n" +
        "        if (n === 0)\n" +
        "          return 1;\n" +
        "        else\n" +
        "          return n * f(n - 1);\n" +
        "       };\n" +
        "     }));\n" +
        "\n" +
        "factorial(5)\n",
        "var factorial;\n" +
        "{\n" +
        "var M$jscomp$inline_4 = function(f$jscomp$2) {\n" +
        "  return function(n){if(n===0)return 1;else return n*f$jscomp$2(n-1)}\n" +
        "};\n" +
        "{\n" +
        "var f$jscomp$inline_0=function(f$jscomp$inline_7){\n" +
        "  return M$jscomp$inline_4(\n" +
        "    function(arg$jscomp$inline_8){\n" +
        "      return f$jscomp$inline_7(f$jscomp$inline_7)(arg$jscomp$inline_8)\n" +
        "     })\n" +
        "};\n" +
        "factorial=M$jscomp$inline_4(\n" +
        "  function(arg$jscomp$inline_1){\n" +
        "    return f$jscomp$inline_0(f$jscomp$inline_0)(arg$jscomp$inline_1)\n" +
        "});\n" +
        "}\n" +
        "}" +
        "factorial(5)");
  }

  @Test
  public void testRenamePropertyFunction() {
    testSame("function JSCompiler_renameProperty(x) {return x} " +
             "JSCompiler_renameProperty('foo')");
  }

  @Test
  public void testReplacePropertyFunction() {
    // baseline: an alias doesn't prevents declaration removal, but not
    // inlining.
    test("function f(x) {return x} " +
         "foo(window, f); f(1)",
         "function f(x) {return x} " +
         "foo(window, f); 1");
  }

  @Test
  public void testInlineWithClosureContainingThis() {
    test("(function (){return f(function(){return this})})();",
         "f(function(){return this})");
  }

  @Test
  public void testIssue5159924a() {
    test(
        lines(
            "function f() { if (x()) return y(); }",
            "while(1) { var m = f() || z() }"),
        lines(
            "for(;1;) {",
            "  var JSCompiler_inline_result$jscomp$0;",
            "  {",
            "    JSCompiler_inline_label_f_1: {",
            "      if(x()) {",
            "        JSCompiler_inline_result$jscomp$0 = y();",
            "        break JSCompiler_inline_label_f_1;",
            "      }",
            "      JSCompiler_inline_result$jscomp$0 = void 0;",
            "    }",
            "  }",
            "  var m = JSCompiler_inline_result$jscomp$0 || z()",
            "}"));
  }

  @Test
  public void testIssue5159924b() {
    test(
        lines(
            "function f() { if (x()) return y(); }",
            "while(1) { var m = f(); }"),
        lines(
            "for(;1;) {",
            "  var m;",
            "  {",
            "    JSCompiler_inline_label_f_0: { ",
            "      if(x()) {",
            "        m = y();",
            "        break JSCompiler_inline_label_f_0;",
            "      }",
            "      m = void 0;",
            "    }",
            "  }",
            "}"));
  }

  @Test
  public void testInlineObject() {
    disableCompareAsTree();
    enableComputeSideEffects();

    this.inliningReach = Reach.LOCAL_ONLY;
    assumeStrictThis = true;
    assumeMinimumCapture = true;

    // TODO(johnlenz): normalize the AST so an AST comparison can be done.
    // As is, the expected AST does not match the actual correct result:
    // The AST matches "g.a()" with a FREE_CALL annotation, but this as
    // expected string would fail as it won't be mark as a free call.
    // "(0,g.a)()" matches the output, but not the resulting AST.
    test("function inner(){function f(){return g.a}(f())()}",
        "function inner(){(0,g.a)()}");
  }

  @Test
  public void testBug4944818() {
    test(
        "var getDomServices_ = function(self) {\n" +
        "  if (!self.domServices_) {\n" +
        "    self.domServices_ = goog$component$DomServices.get(" +
        "        self.appContext_);\n" +
        "  }\n" +
        "\n" +
        "  return self.domServices_;\n" +
        "};\n" +
        "\n" +
        "var getOwnerWin_ = function(self) {\n" +
        "  return getDomServices_(self).getDomHelper().getWindow();\n" +
        "};\n" +
        "\n" +
        "HangoutStarter.prototype.launchHangout = function() {\n" +
        "  var self = a.b;\n" +
        "  var myUrl = new goog.Uri(getOwnerWin_(self).location.href);\n" +
        "};",
        "HangoutStarter.prototype.launchHangout = function() { " +
        "  var self$jscomp$2 = a.b;" +
        "  var JSCompiler_temp_const$jscomp$0 = goog.Uri;" +
        "  var JSCompiler_inline_result$jscomp$1;" +
        "  {" +
        "  var self$jscomp$inline_2 = self$jscomp$2;" +
        "  if (!self$jscomp$inline_2.domServices_) {" +
        "    self$jscomp$inline_2.domServices_ = goog$component$DomServices.get(" +
        "        self$jscomp$inline_2.appContext_);" +
        "  }" +
        "  JSCompiler_inline_result$jscomp$1=self$jscomp$inline_2.domServices_;" +
        "  }" +
        "  var myUrl = new JSCompiler_temp_const$jscomp$0(" +
        "      JSCompiler_inline_result$jscomp$1.getDomHelper()." +
        "          getWindow().location.href)" +
        "}");
  }

  // http://blickly.github.io/closure-compiler-issues/#423
  @Test
  public void testIssue423() {
    assumeMinimumCapture = false;
    test(
        lines(
            "(function($) {",
            "  $.fn.multicheck = function(options) {",
            "    initialize.call(this, options);",
            "  };",
            "",
            "  function initialize(options) {",
            "    options.checkboxes = $(this).siblings(':checkbox');",
            "    preload_check_all.call(this);",
            "  }",
            "",
            "  function preload_check_all() {",
            "    $(this).data('checkboxes');",
            "  }",
            "})(jQuery)"),
        lines(
            "(function($){",
            "  $.fn.multicheck=function(options$jscomp$1) {",
            "    {",
            "      options$jscomp$1.checkboxes=$(this).siblings(':checkbox');",
            "      {",
            "        $(this).data('checkboxes');",
            "      }",
            "    }",
            "  }",
            "})(jQuery)"));
  }

  // http://blickly.github.io/closure-compiler-issues/#423
  @Test
  public void testIssue423_minCap() {
    assumeMinimumCapture = true;
    test(
        lines(
            "(function($) {",
            "  $.fn.multicheck = function(options) {",
            "    initialize.call(this, options);",
            "  };",
            "",
            "  function initialize(options) {",
            "    options.checkboxes = $(this).siblings(':checkbox');",
            "    preload_check_all.call(this);",
            "  }",
            "",
            "  function preload_check_all() {",
            "    $(this).data('checkboxes');",
            "  }",
            "})(jQuery)"),
        lines(
            "{",
            "  var $$jscomp$inline_0=jQuery;",
            "  $$jscomp$inline_0.fn.multicheck=function(options$jscomp$inline_4) {",
            "    {",
            "      options$jscomp$inline_4.checkboxes =",
            "          $$jscomp$inline_0(this).siblings(':checkbox');",
            "      {",
            "         $$jscomp$inline_0(this).data('checkboxes')",
            "      }",
            "    }",
            "  }",
            "}"));
  }

  // http://blickly.github.io/closure-compiler-issues/#728
  @Test
  public void testIssue728() {
    String f = "var f = function() { return false; };";
    StringBuilder calls = new StringBuilder();
    StringBuilder folded = new StringBuilder();
    for (int i = 0; i < 30; i++) {
      calls.append("if (!f()) alert('x');");
      folded.append("if (!false) alert('x');");
    }

    test(f + calls, folded.toString());
  }

  @Test
  public void testAnonymous1() {
    assumeMinimumCapture = false;
    test("(function(){var a=10;(function(){var b=a;a++;alert(b)})()})();",
         "{var a$jscomp$inline_0=10;" +
         "{var b$jscomp$inline_1=a$jscomp$inline_0;" +
         "a$jscomp$inline_0++;alert(b$jscomp$inline_1)}}");

    assumeMinimumCapture = true;
    test("(function(){var a=10;(function(){var b=a;a++;alert(b)})()})();",
        "{var a$jscomp$inline_2=10;" +
        "{var b$jscomp$inline_0=a$jscomp$inline_2;" +
        "a$jscomp$inline_2++;alert(b$jscomp$inline_0)}}");
  }

  @Test
  public void testAnonymous2() {
    testSame(lines(
        "(function(){",
        "  eval();",
        "  (function(){",
        "    var b=a;",
        "    a++;",
        "    alert(b)",
        "  })()",
        "})();"));
  }

  @Test
  public void testAnonymous3() {
    // Introducing a new value into is tricky
    assumeMinimumCapture = false;
    testSame("(function(){var a=10;(function(){arguments;})()})();");

    assumeMinimumCapture = true;
    test("(function(){var a=10;(function(){arguments;})()})();",
         "{var a$jscomp$inline_0=10;(function(){arguments;})();}");

    test("(function(){(function(){arguments;})()})();",
        "{(function(){arguments;})()}");
  }

  @Test
  public void testLoopWithFunctionWithFunction() {
    assumeMinimumCapture = true;
    test(
        lines(
            "function _testLocalVariableInLoop_() {",
            "  var result = 0;",
            "  function foo() {",
            "    var arr = [1, 2, 3, 4, 5];",
            "    for (var i = 0, l = arr.length; i < l; i++) {",
            "      var j = arr[i];",
            "      // Don't inline this function; the correct behavior depends on captured values.",
            "      (function() {",
            "        var k = j;",
            "        setTimeout(function() { result += k; }, 5 * i);",
            "      })();",
            "    }",
            "  }",
            "  foo();",
            "}"),
        lines(
            "function _testLocalVariableInLoop_() {",
            "  var result = 0;",
            "  {",
            "    var arr$jscomp$inline_0 = [1,2,3,4,5];",
            "    var i$jscomp$inline_1 = 0;",
            "    var l$jscomp$inline_2 = arr$jscomp$inline_0.length;",
            "    for(;i$jscomp$inline_1 < l$jscomp$inline_2; i$jscomp$inline_1++) {",
            "      var j$jscomp$inline_3 = arr$jscomp$inline_0[i$jscomp$inline_1];",
            "      (function(){",
            "        var k$jscomp$inline_4 = j$jscomp$inline_3;",
            "        setTimeout(function() {result += k$jscomp$inline_4; }, 5*i$jscomp$inline_1)",
            "      })()",
            "    }",
            "  }",
            "}"));
  }

  @Test
  public void testMethodWithFunctionWithFunction() {
    assumeMinimumCapture = true;
    test(
        lines(
            "function _testLocalVariable_() {",
            "  var result = 0;",
            "  function foo() {",
            "      var j = [i];",
            "      (function(j) {",
            "        setTimeout(function() { result += j; }, 5 * i);",
            "      })(j);",
            "      j = null;",
            "  }",
            "  foo();",
            "}"),
        lines(
            "function _testLocalVariable_(){",
            "  var result = 0;",
            "  {",
            "    var j$jscomp$inline_2 = [i];",
            "    {",
            "      var j$jscomp$inline_0 = j$jscomp$inline_2;", // this temp is needed.
            "      setTimeout(function(){ result += j$jscomp$inline_0; }, 5*i);",
            "    }",
            "    j$jscomp$inline_2 = null;", // because this value can be modified later.
            "  }",
            "}"));
  }

  // Inline a single reference function into deeper modules
  @Test
  public void testCrossModuleInlining1() {
    test(createModuleChain(
             // m1
             "function foo(){return f(1)+g(2)+h(3);}",
             // m2
             "foo()"
             ),
         new String[] {
             // m1
             "",
             // m2
             "f(1)+g(2)+h(3);"
            }
        );
  }

  // Inline a single reference function into shallow modules, only if it
  // is cheaper than the call itself.
  @Test
  public void testCrossModuleInlining2() {
    testSame(createModuleChain(
                // m1
                "foo()",
                // m2
                "function foo(){return f(1)+g(2)+h(3);}"
                )
            );

    test(createModuleChain(
             // m1
             "foo()",
             // m2
             "function foo(){return f();}"
             ),
         new String[] {
             // m1
             "f();",
             // m2
             ""
            }
        );
  }

  // Inline a multi-reference functions into shallow modules, only if it
  // is cheaper than the call itself.
  @Test
  public void testCrossModuleInlining3() {
    testSame(createModuleChain(
                // m1
                "foo()",
                // m2
                "function foo(){return f(1)+g(2)+h(3);}",
                // m3
                "foo()"
                )
            );

    test(createModuleChain(
             // m1
             "foo()",
             // m2
             "function foo(){return f();}",
             // m3
             "foo()"
             ),
         new String[] {
             // m1
             "f();",
             // m2
             "",
             // m3
             "f();"
            }
         );
  }

  @Test
  public void test6671158() throws Exception {
    CompilerTestCase tester = new InlineFunctionsTest() {
      @Override void maybeEnableInferConsts() {}
    };

    tester.setUp();
    tester.test(
        "function f() {return g()}" +
        "function Y(a){a.loader_()}" +
        "function _Z(){}" +
        "function _X() { new _Z(a,b, Y(singleton), f()) }",

        "function _Z(){}" +
        "function _X(){" +
        "  var JSCompiler_temp_const$jscomp$2=_Z;" +
        "  var JSCompiler_temp_const$jscomp$1=a;" +
        "  var JSCompiler_temp_const$jscomp$0=b;" +
        "  var JSCompiler_inline_result$jscomp$3;" +
        "  {" +
        "    singleton.loader_();" +
        "    JSCompiler_inline_result$jscomp$3=void 0;" +
        "  }" +
        "  new JSCompiler_temp_const$jscomp$2(" +
        "    JSCompiler_temp_const$jscomp$1," +
        "    JSCompiler_temp_const$jscomp$0," +
        "    JSCompiler_inline_result$jscomp$3," +
        "    g())}");
    tester.tearDown();
  }

  @Test
  public void test6671158b() {
    test(
        "function f() {return g()}" +
        "function Y(a){a.loader_()}" +
        "function _Z(){}" +
        "function _X() { new _Z(a,b, Y(singleton), f()) }",

        "function _Z(){}" +
        "function _X(){" +
        "  var JSCompiler_temp_const$jscomp$1=a;" +
        "  var JSCompiler_temp_const$jscomp$0=b;" +
        "  var JSCompiler_inline_result$jscomp$2;" +
        "  {" +
        "    singleton.loader_();" +
        "    JSCompiler_inline_result$jscomp$2=void 0;" +
        "  }" +
        "  new _Z(" +
        "    JSCompiler_temp_const$jscomp$1," +
        "    JSCompiler_temp_const$jscomp$0," +
        "    JSCompiler_inline_result$jscomp$2," +
        "    g())}");
  }

  @Test
  public void test8609285a() {
   test(
       "function f(x){ for(x in y){} } f()",
       "{var x$jscomp$inline_0=void 0;for(x$jscomp$inline_0 in y);}");
  }

  @Test
  public void test8609285b() {
    test(
        "function f(x){ for(var x in y){} } f()",
        "{var x$jscomp$inline_0=void 0;for(x$jscomp$inline_0 in y);}");
   }

  // http://blickly.github.io/closure-compiler-issues/#1101
  @Test
  public void testIssue1101() {
    test(
        "var x = (function (saved) {" +
        "    return modifyObjProp(obj) + saved;" +
        "  })(obj[\"prop\"]);",
        "var x;" +
        "{" +
        "  var saved$jscomp$inline_0=obj[\"prop\"];x=modifyObjProp(obj)+\n" +
        "     saved$jscomp$inline_0" +
        "}");
  }

  @Test
  public void testMaxFunSizeAfterInlining() {
    this.maxSizeAfterInlining = 1;
    test(// Always inline single-statement functions
        "function g() { return 123; }\n" +
        "function f() { g(); }",
        "function f() { 123; }");

    this.maxSizeAfterInlining = 10;
    test(// Always inline at the top level
        "function g() { 123; return 123; }\n" +
        "g();",
        "{ 123; 123; }");

    this.maxSizeAfterInlining = 1;
    testSame(// g is too big to be inlined
        "function g() { 123; return 123; }\n" +
        "g();");

    this.maxSizeAfterInlining = 20;
    test(
        "function g() { 123; return 123; }\n" +
        "function f() {\n" +
        "  g();\n" +
        "}",
        "");

    // g's size ends up exceeding the max size because all inlining decisions
    // were made in the same inlining round.
    this.maxSizeAfterInlining = 25;
    test(
        "function f1() { 1; return 1; }\n" +
        "function f2() { 2; return 2; }\n" +
        "function f3() { 3; return 3; }\n" +
        "function f4() { 4; return 4; }\n" +
        "function g() {\n" +
        "  f1(); f2(); f3(); f4();\n" +
        "}\n" +
        "g(); g(); g();",
        "function g() { {1; 1;} {2; 2;} {3; 3;} {4; 4;} }\ng(); g(); g();");

    this.maxSizeAfterInlining =
        CompilerOptions.UNLIMITED_FUN_SIZE_AFTER_INLINING;
  }

  @Test
  public void testArrowFunctionUndefined() {
    test("var empty = () => {}; empty();", "void 0;");
  }

  @Test
  public void testFunctionProperty() {
    testSame(
        lines(
            "function Foo() {",
            "  this.bar = 0;",
            "}",
            "var a = new Foo();",
            "a.bar;"));
  }

  @Test
  public void testFunctionRestParam() {
    test(
        lines(
            "var f = function(...args) { return args[0]; }",
            "f(8);"),
        "[8][0]");

    test(
        lines(
            "var f = function(...args) { return args.length; }",
            "f();"),
        "[].length;");

    test(
        lines(
            "var f = function(...args) { return args.length; }",
            "f(3, 4);"),
        "[3, 4].length;");
  }

  @Test
  public void testArrowFunctionRestParam() {
    test(
        lines(
            "function foo() {",
            "  var f = (...args) => args[0];",
            "  return f(8);",
            "}",
            "foo();"),
        "[8][0]");

    test(
        lines(
            "function foo() {",
            "  var f = (x, ...args) => x + args[0];",
            "  return f(1, 8);",
            "}",
            "foo();"),
        lines(
            "{",
            "  var JSCompiler_inline_result$jscomp$inline_0;",
            "  {",
            "     var args$jscomp$inline_1 = [8];",
            "     JSCompiler_inline_result$jscomp$inline_0 = 1 + args$jscomp$inline_1[0];",
            "  }",
            "  JSCompiler_inline_result$jscomp$inline_0",
            "}"));

    test(
        lines(
            "function foo() {",
            "  var f = (...args) => args[0].bar;",
            "  return f({bar: 8});",
            "}",
            "foo();"),
        "[{bar: 8}][0].bar");
  }

  @Test
  public void testRestObjectPattern() {
    testSame(
        lines(
            "function countArgs(...{length}) {",
            "  return length;",
            "}",
            "countArgs(1, 1, 1, 1, 1);"));

    testSame(
        lines(
            "function countArgs(x, ...{length}) {",
            "  return length;",
            "}",
            "countArgs(1, 1, 1, 1, 1);"));

    testSame(
        lines(
            "function countArgs(x, ...{length: length}) {",
            "  return length;",
            "}",
            "countArgs(1, 1, 1, 1, 1);"));

    testSame(
        lines(
            "function f(...{'a': x}) { ",
            "  return x; ",
            "}",
            "f(null,null,null,3,null);"));

    testSame(
        lines(
            "function f(...{3: x}) { ",
            "  return x; ",
            "}",
            "f(null,null,null,3,null);"));

    testSame(
        lines(
            "function f(...{x: y}) { ",
            "  return y; ",
            "}",
            "f(null,null,null,3,null);"));

    testSame(
        lines(
            "function f(...{p: x, 3:y}) {",
            "  return y;",
            "}",
            "f(null, null, null, 3, null);"));
  }

  @Test
  public void testObjectPatternParam() {
    testSame(
        lines(
            "function foo({x}) {",
            "  return x+1;",
            "}",
            "foo({x:5});"));

    testSame(
        lines(
            "function foo({x:y}) {",
            "  return y+1;",
            "}",
            "foo({x:5});"));

    testSame(
        lines(
            "function foo({'x':y}) {",
            "  return y+1;",
            "}",
            "foo({x:5});"));

    testSame(
        lines(
            "function foo({x}, {y}) {",
            "  return x+y;",
            "}",
            "foo({x:5}, {y:6});"));

    testSame(
        lines(
            "function foo({x}, {y}) {",
            "  return x+1;",
            "}",
            "foo({x:5}, {y:6});"));

    testSame(
        lines(
            "function foo({x: {y}}) {",
            "  return y + 1;",
            "}",
            "foo(obj);"));

    testSame(
        lines(
            "function foo({a: b, x: {y}}) {",
            "  return y + 1;",
            "}",
            "foo(obj);"));

    testSame(
        lines(
            "function f({x}) {",
            "  return x;",
            "}",
            "class Foo {constructor() {this.x = 0;}}",
            "f(new Foo());"));

    testSame(
        lines(
            "function f({x}) {",
            "  alert(x);",
            "  alert(x)",
            "}",
            "class Foo {constructor() {this.x = 0;}}",
            "f(new Foo());"));

    testSame(
        lines(
            "function f({x}, {y}) {",
            "  alert(x);",
            "  alert(x);",
            "  return y;",
            "}",
            "class Foo {constructor() {this.x = 0;}}",
            "f(new Foo(), {y:6});"));

    testSame(
        lines(
            "function f({x, y}) {",
            "  return x + y;",
            "}",
            "f(obj);"));

    testSame(
        lines(
            "function f({x, y}, {z}) {",
            "  alert(z);",
            "  return x + y;",
            "}",
            "f(obj, new Foo());"));

    testSame(
        lines("function f({x, y}) {",
            "  return x + y;",
            "}",
            "f(getArg());"));

    testSame(
        lines("function f({a, b, c}) {",
            "  return b + c;",
            "}",
            "f(x);"));

    testSame(
        lines(
            "function f({3:x}) {",
            "  return x;",
            "}",
            "f({3:1});"));

    testSame(
        lines(
            "function f({x:{3:y}}) {",
            "  return y;",
            "}",
            "f({x:{3:1}});"));

    testSame(
        lines(
            "function f({p: x, 3: y}) {",
            "  return x;",
            "}",
            "f({p:1, 3:2});"));

    testSame(
        lines(
            "function f({prop1, prop2}) {",
            "  return prop1;",
            "}",
            "f({prop1:5, prop2:6});"));

    testSame(
        lines(
            "function f({'foo bar':x}) {",
            "  return x;",
            "}",
            "f({'foo bar': 1});"));

    testSame(
        lines(
            "function f({'foo_bar':x}) {",
            "  return x;",
            "}",
            "f({'foo_bar': 1});"));

    testSame(
        lines(
            "function f({123: x}) {",
            " return x;",
            "}",
            "f({123: 1});"));

    testSame(
        lines(
            "function f({'1foo': x}) {",
            "  return x;",
            "}",
            "f({'1foo': 1});"));

    testSame(
        lines(
            "function f({foo1 : x}) {",
            "  return x;",
            "}",
            "f({foo1 : 1});"));

    testSame(
        lines(
            "function f({'foo1': x}) {",
            "  return x;",
            "}",
            "f({'foo1': 1});"));

    testSame(
        lines(
            "function f({$foo : x}) {",
            "  return x;",
            "}",
            "f({$foo : 1});"));

    testSame(
        lines(
            "function f({_foo : x}) {",
            "  return x;",
            "}",
            "f({_foo : 1});"));
  }

  @Test
  public void testDefaultObjectPatternParam() {
    testSame(
        lines(
            "function foo({x} = {x:5}) {",
            "  return x+1;",
            "}",
            "foo();"));

    testSame(
        lines(
            "function foo({x} = {x:5}, {y} = {y:3}) {",
            "  return x+y;",
            "}",
            "foo();"));

    testSame(
        lines(
            "let defaultObj = {x: 5};",
            "function foo({x} = defaultObj) {",
            "  return x;",
            "}",
            "foo();"));

    testSame(
        lines(
            "function f({a, b, c} = {a:1, b:2, c:3}) {",
            " return b+c;",
            "}",
            "f();"));

    testSame(
        lines(
            "function f({p:x, 3:y} = {p:1, 3:2}) {",
            " return x+y;",
            "}",
            "f();"));

    testSame(
        lines(
            "function foo(a, { b = '', c = '' } = {}) {",
            "  return a;",
            "}",
            "foo();"
        ));
  }

  @Test
  public void testObjectPatternParamWithMultipleDestructuredNames() {
    testSame(
        lines(
            "function f({x, y}) {",
            "  return x + y;",
            "}",
            "alert(f({x: sideEffects1(), y: sideEffects2()}));"));
  }

  @Test
  public void testArrayPatternParam() {
    testSame("function f([x]) { return x; } alert(f([3]));");
  }

  @Test
  public void testObjectPatternParamWithDefaults() {
    testSame(
        lines(
            "function foo({x = 3}) {",
            "  return x;",
            "}",
            "alert(foo({}));"));

    testSame(
        lines(
            "function foo({x = 3}) {",
            "  return x;",
            "}",
            "alert(foo({x: 3}));"
        ));

    testSame(
        lines(
            "function foo({x = 3}, y) {",
            "  return y;",
            "}",
            "alert(foo({x: 3}, 4));"
        ));

    testSame(
        lines(
            "function foo({x = 3} = {}) {",
            "  return x;",
            "}",
            "alert(foo());"
        ));

    testSame(
        lines(
            "function foo(x, ...{length = 5}) {",
            "  return x * length;",
            "}",
            "alert(foo(3));"));
  }

  @Test
  public void testDefaultParam() {
    testSame(
        lines(
            "function foo(a, b = 1) {",
            "  return a + b;",
            "}",
            "foo(1);"));

    testSame(
        lines("function foo(a, b = 1) {",
            "  return a + b;",
            "}",
            "foo(1, 2);"));

    testSame(
        lines(
            "function foo(a = 1, b = 2) {",
            "  return a + b;",
            "}",
            "foo(3, 4);"));

    testSame(
        lines(
            "function foo(a, b = {foo: 5}) {",
            "  return a + b.foo;",
            "}",
            "foo(3, {foo: 9});"));

    testSame(
        lines(
            "function foo(a, b = {'foo': 5}) {",
            "  return a + b['foo'];",
            "}",
            "foo(3, {'foo': 9});"));

    testSame(
        lines(
            "function foo(a, b = {foo: 5, bar: 6}) {",
            "  return a + b.foo + b.bar;",
            "}",
            "foo(3, {foo: 1, bar: 2});"));

    testSame(
        lines(
            "function foo(a, b = {foo: 5}) {",
            "  return a + b.foo;",
            "}",
            "foo(3);"));

    testSame(
        lines(
            "function foo(a, b = {foo: 5, bar: 6}) {",
            "  return a + b.foo + b.bar;",
            "}",
            "foo(3, {foo: 1});"));

    testSame(
        lines(
            "function foo(a, b = [1, 2]) {",
            "  return a + b[1];",
            "}",
            "foo(3, [7, 8]);"));

    testSame(
        lines(
            "function foo(a, b = []) {",
            "  return a + b[1];",
            "}",
            "foo(3, [7, 8]);"));
  }

  @Test
  public void testDefaultParam_argIsUndefined() {
    testSame(
        lines(
            "function foo(a, b = 1) {",
            "  return a + b;",
            "}",
            "foo(1, undefined);"));
  }

  @Test
  public void testDefaultParam_argIsUnknown() {
    testSame(
        lines(
            "function foo(a, b = 1) {",
            "  return a + b;",
            "}",
            "foo(1, x);"));
  }

  @Test
  public void testDefaultParam_withAssign() {
    testSame(
        lines(
            "function foo(x = undefined) {",
            "  if (!x) {",
            "    x = 2;",
            "  }",
            "  return x;",
            "}",
            "foo(4);"));
  }

  @Test
  public void testNestedDefaultParam() {
    testSame(
        lines(
            "function foo(a = b = 1) {",
            "  return a;",
            "}",
            "foo();"));

    testSame(
        lines(
            "function foo(c = {a:(b = 1)}) {",
            "  return c;",
            "}",
            "foo();"));
  }

  @Test
  public void testSpreadCall_withKnownArray_isNotInlined_andFunctionIsPreserved() {
    testSame(
        lines(
            "function foo(x, y) {",
            "  return x + y;",
            "}",
            "var args = [0, 1];",
            "foo(...args);"));
  }

  @Test
  public void testSpreadCall_withKnownArray_andLiteralArg_isNotInlined_andFunctionIsPreserved() {
    testSame(
        lines(
            "function foo(x, y, z) {",
            "  return x + y + z;",
            "}",
            "var args = [0, 1];",
            "foo(2, ...args);"));
  }

  @Test
  public void testSpreadCall_withArrayLiteral_isNotInlined_andFunctionIsPreserved() {
    testSame(
        lines(
            "function foo(x, y) {",
            "  return x + y;",
            "}",
            "foo(...[0, 1]);"));
  }

  @Test
  public void testSpreadCall_withMultipleSpreads_isNotInlined_andFunctionIsPreserved() {
    testSame(
        lines(
            "function foo(x, y) {",
            "  return x + y;",
            "}",
            "var args = [0];",
            "foo(...args, ...[1]);"));
  }

  @Test
  public void testSpreadCall_withArrayLiteral_forRestParam_isNotInlined_andFunctionIsPreserved() {
    testSame(
        lines(
            "function foo(...args) {",
            "  return args.length;",
            "}",
            "foo(...[0,1]);"));
  }

  @Test
  public void testSpreadCall_withKnownArray_intoIife_isNotInlined() {
    testSame(
        lines(
            "var args = [0, 1];", //
            "(function foo(x, y) { return x + y; })(...args);"));
  }

  @Test
  public void testSpreadCall_withKnownArray_andLiteralArg_intoIife_isNotInlined() {
    testSame(
        lines(
            "var args = [0, 1];",
            "(function foo(x, y, z) {",
            "  return x + y + z;",
            "})(2, ...args);"));
  }

  @Test
  public void testSpreadCall_withArrayLiteral_intoIife_isNotInlined() {
    testSame("(function (x, y) {  return x + y; })(...[0, 1]);");
  }

  @Test
  public void testSpreadCall_withSpreadAsIndirectDescendent_call_isInlined() {
    test(
        lines(
            "function foo(x) {", //
            "  return x;",
            "}",
            "",
            "foo(bar(...arg));"),
        lines("bar(...arg);"));
  }

  @Test
  public void testSpreadCall_withSpreadAsIndirectDescendent_arrrayLit_isInlined() {
    test(
        lines(
            "function foo(x) {", //
            "  return x;",
            "}",
            "",
            "foo([...arg]);"),
        lines("[...arg];"));
  }

  @Test
  public void testSpreadCall_withBlockInlinableFunction_asSpreadArg_isInlined() {
    test(
        lines(
            "function foo(x) {", //
            "  qux();", // Something with a side-effect.
            "  return x;",
            "}",
            "",
            "bar(...foo(arg));"),
        lines(
            "var JSCompiler_temp_const$jscomp$0 = bar;",
            "var JSCompiler_inline_result$jscomp$1;",
            "{",
            "  var x$jscomp$inline_2 = arg;",
            "  qux();",
            "  JSCompiler_inline_result$jscomp$1 = x$jscomp$inline_2;",
            "}",
            "",
            "JSCompiler_temp_const$jscomp$0(...JSCompiler_inline_result$jscomp$1);"));
  }

  @Test
  public void testSpreadCall_withBlockInlinableFunction_withPrecedingSpreadArg_isInlined() {
    test(
        lines(
            "function foo(x) {", //
            "  qux();", // Something with a side-effect.
            "  return x;",
            "}",
            "",
            "bar(...zap(), foo(arg));"),
        lines(
            "var JSCompiler_temp_const$jscomp$1 = bar;",
            "var JSCompiler_temp_const$jscomp$0 = [...zap()];",
            "var JSCompiler_inline_result$jscomp$2;",
            "{",
            "  var x$jscomp$inline_3 = arg;",
            "  qux();",
            "  JSCompiler_inline_result$jscomp$2 = x$jscomp$inline_3;",
            "}",
            "",
            "JSCompiler_temp_const$jscomp$1(",
            "  ...JSCompiler_temp_const$jscomp$0,",
            "  JSCompiler_inline_result$jscomp$2);"));
  }

  @Test
  public void testGeneratorFunction() {
    testSame(
        lines(
            "function* foo() {}",
            "var bar = foo();"));

    testSame(
        lines(
            "function* foo() {",
            "  yield 'X';",
            "  return 'Y';",
            "}",
            "var bar = foo();"));

    testSame(
        lines(
            "function* foo() {",
            "  yield 'X';",
            "}",
            "foo();"));

    testSame(
        lines(
            "function* foo() {",
            "  return 1;",
            "}",
            "foo();"));
  }

  @Test
  public void testAsyncFunction() {
    testSame(
        lines(
            "async function foo() {}",
            "foo().then(result => { alert(result); } );"));

    testSame(
        lines(
            "async function foo() {",
            "  return 'Y';",
            "}",
            "foo().then(result => { alert(result); } );"));

    // We could possibly inline here since the return statement already contains a promise.
    testSame(
        lines(
            "async function foo() {",
            " return new Promise((resolve, reject) => { resolve('Success'); } );",
            "}",
            "foo().then(result => { alert(result); } );"));
  }

  @Test
  public void testFunctionReferencingLetInNonGlobalBlock() {
    testSame(
        lines(
            "if (true) {",
            "  let value = 1;",
            "  var g = function() {",
            "    return value + 1;",
            "  }",
            "}",
            "alert(g(10));"));
  }

  @Test
  public void testNotInliningFunctionWithSuper() {
    // Super field accessor arrow functions like this one are used for transpilation of some
    // features such as async functions and async generators. If inlined, it becomes a syntax error
    // as the inner function has no super.
    testSame(
        lines(
            "class A { m(){ return 1 } };",
            "class B extends A {",
            "  m() {",
            "    const super$m = () => super.m;",
            "    const jscomp$this = this;",
            "    return function*() {",
            "      yield super$m().call(jscomp$this);",
            "    };",
            "  }",
            "}"));
  }
}