diff --git a/clang/unittests/AST/ASTTraverserTest.cpp b/clang/unittests/AST/ASTTraverserTest.cpp
diff --git a/clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp b/clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp
@@ -2331,6 +2331,353 @@ template<> bool timesTwo<bool>(bool){
   }
 }
 
+TEST(Traversal, traverseNoImplicit) {
+  StringRef Code = R"cpp(
+struct NonTrivial {
+    NonTrivial() {}
+    NonTrivial(const NonTrivial&) {}
+    NonTrivial& operator=(const NonTrivial&) { return *this; }
+
+    ~NonTrivial() {}
+};
+
+struct NoSpecialMethods {
+    NonTrivial nt;
+};
+
+struct ContainsArray {
+    NonTrivial arr[2];
+    ContainsArray& operator=(const ContainsArray &other) = default;
+};
+
+void copyIt()
+{
+    NoSpecialMethods nc1;
+    NoSpecialMethods nc2(nc1);
+    nc2 = nc1;
+
+    ContainsArray ca;
+    ContainsArray ca2;
+    ca2 = ca;
+}
+
+struct HasCtorInits : NoSpecialMethods, NonTrivial
+{
+  int m_i;
+  NonTrivial m_nt;
+  HasCtorInits() : NoSpecialMethods(), m_i(42) {}
+};
+
+struct CtorInitsNonTrivial : NonTrivial
+{
+  int m_i;
+  NonTrivial m_nt;
+  CtorInitsNonTrivial() : NonTrivial(), m_i(42) {}
+};
+
+)cpp";
+  {
+    auto M = cxxRecordDecl(hasName("NoSpecialMethods"),
+                           has(cxxRecordDecl(hasName("NoSpecialMethods"))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+
+    M = cxxRecordDecl(hasName("NoSpecialMethods"),
+                      has(cxxConstructorDecl(isCopyConstructor())));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+
+    M = cxxRecordDecl(hasName("NoSpecialMethods"),
+                      has(cxxMethodDecl(isCopyAssignmentOperator())));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+
+    M = cxxRecordDecl(hasName("NoSpecialMethods"),
+                      has(cxxConstructorDecl(isDefaultConstructor())));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+
+    M = cxxRecordDecl(hasName("NoSpecialMethods"), has(cxxDestructorDecl()));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+
+    M = cxxRecordDecl(hasName("NoSpecialMethods"),
+                      hasMethod(cxxConstructorDecl(isCopyConstructor())));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+
+    M = cxxRecordDecl(hasName("NoSpecialMethods"),
+                      hasMethod(cxxMethodDecl(isCopyAssignmentOperator())));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+
+    M = cxxRecordDecl(hasName("NoSpecialMethods"),
+                      hasMethod(cxxConstructorDecl(isDefaultConstructor())));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+
+    M = cxxRecordDecl(hasName("NoSpecialMethods"),
+                      hasMethod(cxxDestructorDecl()));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    // Because the copy-assignment operator is not spelled in the
+    // source (ie, isImplicit()), we don't match it
+    auto M =
+        cxxOperatorCallExpr(hasType(cxxRecordDecl(hasName("NoSpecialMethods"))),
+                            callee(cxxMethodDecl(isCopyAssignmentOperator())));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    // Compiler generates a forStmt to copy the array
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, forStmt())));
+    EXPECT_FALSE(
+        matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, forStmt())));
+  }
+  {
+    // The defaulted method declaration can be matched, but not its
+    // definition, in IgnoreUnlessSpelledInSource mode
+    auto MDecl = cxxMethodDecl(ofClass(cxxRecordDecl(hasName("ContainsArray"))),
+                               isCopyAssignmentOperator(), isDefaulted());
+
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, MDecl)));
+    EXPECT_TRUE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, MDecl)));
+
+    auto MDef = cxxMethodDecl(MDecl, has(compoundStmt()));
+
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, MDef)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, MDef)));
+
+    auto MBody = cxxMethodDecl(MDecl, hasBody(compoundStmt()));
+
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, MBody)));
+    EXPECT_FALSE(
+        matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, MBody)));
+
+    auto MIsDefn = cxxMethodDecl(MDecl, isDefinition());
+
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, MIsDefn)));
+    EXPECT_TRUE(
+        matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, MIsDefn)));
+
+    auto MIsInline = cxxMethodDecl(MDecl, isInline());
+
+    EXPECT_FALSE(matches(Code, traverse(TK_AsIs, MIsInline)));
+    EXPECT_FALSE(
+        matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, MIsInline)));
+
+    // The parameter of the defaulted method can still be matched.
+    auto MParm =
+        cxxMethodDecl(MDecl, hasParameter(0, parmVarDecl(hasName("other"))));
+
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, MParm)));
+    EXPECT_TRUE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, MParm)));
+  }
+  {
+    auto M =
+        cxxConstructorDecl(hasName("HasCtorInits"),
+                           has(cxxCtorInitializer(forField(hasName("m_i")))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_TRUE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M =
+        cxxConstructorDecl(hasName("HasCtorInits"),
+                           has(cxxCtorInitializer(forField(hasName("m_nt")))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = cxxConstructorDecl(hasName("HasCtorInits"),
+                                hasAnyConstructorInitializer(cxxCtorInitializer(
+                                    forField(hasName("m_nt")))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M =
+        cxxConstructorDecl(hasName("HasCtorInits"),
+                           forEachConstructorInitializer(
+                               cxxCtorInitializer(forField(hasName("m_nt")))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = cxxConstructorDecl(
+        hasName("CtorInitsNonTrivial"),
+        has(cxxCtorInitializer(withInitializer(cxxConstructExpr(
+            hasDeclaration(cxxConstructorDecl(hasName("NonTrivial"))))))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_TRUE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = cxxConstructorDecl(
+        hasName("HasCtorInits"),
+        has(cxxCtorInitializer(withInitializer(cxxConstructExpr(hasDeclaration(
+            cxxConstructorDecl(hasName("NoSpecialMethods"))))))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = cxxCtorInitializer(forField(hasName("m_nt")));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+
+  Code = R"cpp(
+  void rangeFor()
+  {
+    int arr[2];
+    for (auto i : arr)
+    {
+
+    }
+  }
+  )cpp";
+  {
+    auto M = cxxForRangeStmt(has(binaryOperator(hasOperatorName("!="))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M =
+        cxxForRangeStmt(hasDescendant(binaryOperator(hasOperatorName("+"))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M =
+        cxxForRangeStmt(hasDescendant(unaryOperator(hasOperatorName("++"))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = cxxForRangeStmt(has(declStmt()));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M =
+        cxxForRangeStmt(hasLoopVariable(varDecl(hasName("i"))),
+                        hasRangeInit(declRefExpr(to(varDecl(hasName("arr"))))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_TRUE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = cxxForRangeStmt(unless(hasInitStatement(stmt())));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_TRUE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = cxxForRangeStmt(hasBody(stmt()));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_TRUE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+
+  Code = R"cpp(
+  void rangeFor()
+  {
+    int arr[2];
+    for (auto& a = arr; auto i : a)
+    {
+
+    }
+  }
+  )cpp";
+  {
+    auto M = cxxForRangeStmt(has(binaryOperator(hasOperatorName("!="))));
+    EXPECT_TRUE(
+        matchesConditionally(Code, traverse(TK_AsIs, M), true, {"-std=c++20"}));
+    EXPECT_FALSE(
+        matchesConditionally(Code, traverse(TK_IgnoreUnlessSpelledInSource, M),
+                             true, {"-std=c++20"}));
+  }
+  {
+    auto M =
+        cxxForRangeStmt(hasDescendant(binaryOperator(hasOperatorName("+"))));
+    EXPECT_TRUE(
+        matchesConditionally(Code, traverse(TK_AsIs, M), true, {"-std=c++20"}));
+    EXPECT_FALSE(
+        matchesConditionally(Code, traverse(TK_IgnoreUnlessSpelledInSource, M),
+                             true, {"-std=c++20"}));
+  }
+  {
+    auto M =
+        cxxForRangeStmt(hasDescendant(unaryOperator(hasOperatorName("++"))));
+    EXPECT_TRUE(
+        matchesConditionally(Code, traverse(TK_AsIs, M), true, {"-std=c++20"}));
+    EXPECT_FALSE(
+        matchesConditionally(Code, traverse(TK_IgnoreUnlessSpelledInSource, M),
+                             true, {"-std=c++20"}));
+  }
+  {
+    auto M = cxxForRangeStmt(has(declStmt()));
+    EXPECT_TRUE(
+        matchesConditionally(Code, traverse(TK_AsIs, M), true, {"-std=c++20"}));
+    EXPECT_FALSE(
+        matchesConditionally(Code, traverse(TK_IgnoreUnlessSpelledInSource, M),
+                             true, {"-std=c++20"}));
+  }
+  {
+    auto M = cxxForRangeStmt(
+        hasInitStatement(declStmt(hasSingleDecl(varDecl(
+            hasName("a"),
+            hasInitializer(declRefExpr(to(varDecl(hasName("arr"))))))))),
+        hasLoopVariable(varDecl(hasName("i"))),
+        hasRangeInit(declRefExpr(to(varDecl(hasName("a"))))));
+    EXPECT_TRUE(
+        matchesConditionally(Code, traverse(TK_AsIs, M), true, {"-std=c++20"}));
+    EXPECT_TRUE(
+        matchesConditionally(Code, traverse(TK_IgnoreUnlessSpelledInSource, M),
+                             true, {"-std=c++20"}));
+  }
+  Code = R"cpp(
+void hasDefaultArg(int i, int j = 0)
+{
+}
+void callDefaultArg()
+{
+  hasDefaultArg(42);
+}
+)cpp";
+  auto hasDefaultArgCall = [](auto InnerMatcher) {
+    return callExpr(callee(functionDecl(hasName("hasDefaultArg"))),
+                    InnerMatcher);
+  };
+  {
+    auto M = hasDefaultArgCall(has(integerLiteral(equals(42))));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_TRUE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = hasDefaultArgCall(has(cxxDefaultArgExpr()));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = hasDefaultArgCall(argumentCountIs(2));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = hasDefaultArgCall(argumentCountIs(1));
+    EXPECT_FALSE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_TRUE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = hasDefaultArgCall(hasArgument(1, cxxDefaultArgExpr()));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+  {
+    auto M = hasDefaultArgCall(hasAnyArgument(cxxDefaultArgExpr()));
+    EXPECT_TRUE(matches(Code, traverse(TK_AsIs, M)));
+    EXPECT_FALSE(matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, M)));
+  }
+}
+
 template <typename MatcherT>
 bool matcherTemplateWithBinding(StringRef Code, const MatcherT &M) {
   return matchAndVerifyResultTrue(

diff --git a/clang/unittests/Tooling/TransformerTest.cpp b/clang/unittests/Tooling/TransformerTest.cpp
@@ -132,6 +132,13 @@ class ClangRefactoringTestBase : public testing::Test {
     compareSnippets(Expected, rewrite(Input));
   }
 
+  template <typename R> void testRuleFailure(R Rule, StringRef Input) {
+    Transformers.push_back(
+        std::make_unique<Transformer>(std::move(Rule), consumer()));
+    Transformers.back()->registerMatchers(&MatchFinder);
+    ASSERT_FALSE(rewrite(Input)) << "Expected failure to rewrite code";
+  }
+
   // Transformers are referenced by MatchFinder.
   std::vector<std::unique_ptr<Transformer>> Transformers;
   clang::ast_matchers::MatchFinder MatchFinder;
@@ -1067,6 +1074,205 @@ TEST_F(TransformerTest, ErrorOccurredMatchSkipped) {
   EXPECT_EQ(ErrorCount, 0);
 }
 
+TEST_F(TransformerTest, ImplicitNodes_ConstructorDecl) {
+
+  std::string OtherStructPrefix = R"cpp(
+struct Other {
+)cpp";
+  std::string OtherStructSuffix = "};";
+
+  std::string CopyableStructName = "struct Copyable";
+  std::string BrokenStructName = "struct explicit Copyable";
+
+  std::string CodeSuffix = R"cpp(
+{
+    Other m_i;
+    Copyable();
+};
+)cpp";
+
+  std::string CopyCtor = "Other(const Other&) = default;";
+  std::string ExplicitCopyCtor = "explicit Other(const Other&) = default;";
+  std::string BrokenExplicitCopyCtor =
+      "explicit explicit explicit Other(const Other&) = default;";
+
+  std::string RewriteInput = OtherStructPrefix + CopyCtor + OtherStructSuffix +
+                             CopyableStructName + CodeSuffix;
+  std::string ExpectedRewriteOutput = OtherStructPrefix + ExplicitCopyCtor +
+                                      OtherStructSuffix + CopyableStructName +
+                                      CodeSuffix;
+  std::string BrokenRewriteOutput = OtherStructPrefix + BrokenExplicitCopyCtor +
+                                    OtherStructSuffix + BrokenStructName +
+                                    CodeSuffix;
+
+  auto MatchedRecord =
+      cxxConstructorDecl(isCopyConstructor()).bind("copyConstructor");
+
+  auto RewriteRule =
+      changeTo(before(node("copyConstructor")), cat("explicit "));
+
+  testRule(makeRule(traverse(TK_IgnoreUnlessSpelledInSource, MatchedRecord),
+                    RewriteRule),
+           RewriteInput, ExpectedRewriteOutput);
+
+  testRule(makeRule(traverse(TK_AsIs, MatchedRecord), RewriteRule),
+           RewriteInput, BrokenRewriteOutput);
+}
+
+TEST_F(TransformerTest, ImplicitNodes_RangeFor) {
+
+  std::string CodePrefix = R"cpp(
+struct Container
+{
+    int* begin() const;
+    int* end() const;
+    int* cbegin() const;
+    int* cend() const;
+};
+
+void foo()
+{
+  const Container c;
+)cpp";
+
+  std::string BeginCallBefore = "  c.begin();";
+  std::string BeginCallAfter = "  c.cbegin();";
+
+  std::string ForLoop = "for (auto i : c)";
+  std::string BrokenForLoop = "for (auto i :.cbegin() c)";
+
+  std::string CodeSuffix = R"cpp(
+  {
+  }
+}
+)cpp";
+
+  std::string RewriteInput =
+      CodePrefix + BeginCallBefore + ForLoop + CodeSuffix;
+  std::string ExpectedRewriteOutput =
+      CodePrefix + BeginCallAfter + ForLoop + CodeSuffix;
+  std::string BrokenRewriteOutput =
+      CodePrefix + BeginCallAfter + BrokenForLoop + CodeSuffix;
+
+  auto MatchedRecord =
+      cxxMemberCallExpr(on(expr(hasType(qualType(isConstQualified(),
+                                                 hasDeclaration(cxxRecordDecl(
+                                                     hasName("Container"))))))
+                               .bind("callTarget")),
+                        callee(cxxMethodDecl(hasName("begin"))))
+          .bind("constBeginCall");
+
+  auto RewriteRule =
+      changeTo(node("constBeginCall"), cat(name("callTarget"), ".cbegin()"));
+
+  testRule(makeRule(traverse(TK_IgnoreUnlessSpelledInSource, MatchedRecord),
+                    RewriteRule),
+           RewriteInput, ExpectedRewriteOutput);
+
+  testRule(makeRule(traverse(TK_AsIs, MatchedRecord), RewriteRule),
+           RewriteInput, BrokenRewriteOutput);
+}
+
+TEST_F(TransformerTest, ImplicitNodes_ForStmt) {
+
+  std::string CodePrefix = R"cpp(
+struct NonTrivial {
+    NonTrivial() {}
+    NonTrivial(NonTrivial&) {}
+    NonTrivial& operator=(NonTrivial const&) { return *this; }
+
+    ~NonTrivial() {}
+};
+
+struct ContainsArray {
+    NonTrivial arr[2];
+    ContainsArray& operator=(ContainsArray const&) = default;
+};
+
+void testIt()
+{
+    ContainsArray ca1;
+    ContainsArray ca2;
+    ca2 = ca1;
+)cpp";
+
+  auto CodeSuffix = "}";
+
+  auto LoopBody = R"cpp(
+    {
+
+    }
+)cpp";
+
+  auto RawLoop = "for (auto i = 0; i != 5; ++i)";
+
+  auto RangeLoop = "for (auto i : boost::irange(5))";
+
+  // Expect to rewrite the raw loop to the ranged loop.
+  // This works in TK_IgnoreUnlessSpelledInSource mode, but TK_AsIs
+  // mode also matches the hidden for loop generated in the copy assignment
+  // operator of ContainsArray. Transformer then fails to transform the code at
+  // all.
+
+  auto RewriteInput =
+      CodePrefix + RawLoop + LoopBody + RawLoop + LoopBody + CodeSuffix;
+
+  auto RewriteOutput =
+      CodePrefix + RangeLoop + LoopBody + RangeLoop + LoopBody + CodeSuffix;
+  {
+    auto MatchedLoop = forStmt(
+        has(declStmt(
+            hasSingleDecl(varDecl(hasInitializer(integerLiteral(equals(0))))
+                              .bind("loopVar")))),
+        has(binaryOperator(hasOperatorName("!="),
+                           hasLHS(ignoringImplicit(declRefExpr(
+                               to(varDecl(equalsBoundNode("loopVar")))))),
+                           hasRHS(expr().bind("upperBoundExpr")))),
+        has(unaryOperator(hasOperatorName("++"),
+                          hasUnaryOperand(declRefExpr(
+                              to(varDecl(equalsBoundNode("loopVar"))))))
+                .bind("incrementOp")));
+
+    auto RewriteRule =
+        changeTo(transformer::enclose(node("loopVar"), node("incrementOp")),
+                 cat("auto ", name("loopVar"), " : boost::irange(",
+                     node("upperBoundExpr"), ")"));
+
+    testRule(makeRule(traverse(TK_IgnoreUnlessSpelledInSource, MatchedLoop),
+                      RewriteRule),
+             RewriteInput, RewriteOutput);
+
+    testRuleFailure(makeRule(traverse(TK_AsIs, MatchedLoop), RewriteRule),
+                    RewriteInput);
+  }
+  {
+    auto MatchedLoop = forStmt(
+        hasLoopInit(declStmt(
+            hasSingleDecl(varDecl(hasInitializer(integerLiteral(equals(0))))
+                              .bind("loopVar")))),
+        hasCondition(binaryOperator(hasOperatorName("!="),
+                                    hasLHS(ignoringImplicit(declRefExpr(to(
+                                        varDecl(equalsBoundNode("loopVar")))))),
+                                    hasRHS(expr().bind("upperBoundExpr")))),
+        hasIncrement(unaryOperator(hasOperatorName("++"),
+                                   hasUnaryOperand(declRefExpr(to(
+                                       varDecl(equalsBoundNode("loopVar"))))))
+                         .bind("incrementOp")));
+
+    auto RewriteRule =
+        changeTo(transformer::enclose(node("loopVar"), node("incrementOp")),
+                 cat("auto ", name("loopVar"), " : boost::irange(",
+                     node("upperBoundExpr"), ")"));
+
+    testRule(makeRule(traverse(TK_IgnoreUnlessSpelledInSource, MatchedLoop),
+                      RewriteRule),
+             RewriteInput, RewriteOutput);
+
+    testRuleFailure(makeRule(traverse(TK_AsIs, MatchedLoop), RewriteRule),
+                    RewriteInput);
+  }
+}
+
 TEST_F(TransformerTest, TemplateInstantiation) {
 
   std::string NonTemplatesInput = R"cpp(