[[FIX]] Templates can not be directives

Return a different kind of lexer token for full template strings such that they are not consumed by string directives.

src/jshint.js

@@ -1992,6 +1992,10 @@ var JSHINT = (function() {
     return this;
   });
 
+  type("(no subst template)", function() {
+    return this;
+  });
+
   type("(regexp)", function() {
     return this;
   });

src/lex.js

@@ -31,7 +31,8 @@ var Token = {
   RegExp: 9,
   TemplateHead: 10,
   TemplateMiddle: 11,
-  TemplateTail: 12
+  TemplateTail: 12,
+  NoSubstTemplate: 13
 };
 
 var Context = {
@@ -1060,8 +1061,8 @@ Lexer.prototype = {
       }
     }
 
-    // Final value is either StringLiteral or TemplateTail
-    tokenType = tokenType === Token.TemplateHead ? Token.StringLiteral : Token.TemplateTail;
+    // Final value is either NoSubstTemplate or TemplateTail
+    tokenType = tokenType === Token.TemplateHead ? Token.NoSubstTemplate : Token.TemplateTail;
     this.skip(1);
     this.context.pop();
 
@@ -1668,6 +1669,15 @@ Lexer.prototype = {
         });
         return create("(template tail)", token.value);
 
+      case Token.NoSubstTemplate:
+        this.trigger("NoSubstTemplate", {
+          line: this.line,
+          char: this.char,
+          from: this.from,
+          value: token.value
+        });
+        return create("(no subst template)", token.value);
+
       case Token.Identifier:
         this.trigger("Identifier", {
           line: this.line,

tests/unit/core.js

@@ -889,6 +889,32 @@ exports.testES6TemplateLiteralMultiline = function (test) {
   test.done();
 };
 
+exports.testES6TemplateLiteralsAreNotDirectives = function (test) {
+  var src = [
+    "function fn() {",
+    "`use strict`;",
+    "return \"\\077\";",
+    "}"
+  ];
+
+  TestRun(test)
+    .addError(2, "Expected an assignment or function call and instead saw an expression.")
+    .test(src, { esnext: true });
+
+  var src2 = [
+    "function fn() {",
+    "`${\"use strict\"}`;",
+    "return \"\\077\";",
+    "}"
+  ];
+
+  TestRun(test)
+    .addError(2, "Expected an assignment or function call and instead saw an expression.")
+    .test(src2, { esnext: true });
+
+  test.done();
+};
+
 exports.testES6ExportStarFrom = function (test) {
   var src = fs.readFileSync(__dirname + "/fixtures/es6-export-star-from.js", "utf8");
   TestRun(test)