Index: cfe/trunk/include/clang/AST/RecursiveASTVisitor.h
===================================================================
--- cfe/trunk/include/clang/AST/RecursiveASTVisitor.h
+++ cfe/trunk/include/clang/AST/RecursiveASTVisitor.h
@@ -2023,7 +2023,8 @@
   if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(D)) {
     // Constructor initializers.
     for (auto *I : Ctor->inits()) {
-      TRY_TO(TraverseConstructorInitializer(I));
+      if (I->isWritten() || getDerived().shouldVisitImplicitCode())
+        TRY_TO(TraverseConstructorInitializer(I));
     }
   }
 
Index: cfe/trunk/unittests/Tooling/CMakeLists.txt
===================================================================
--- cfe/trunk/unittests/Tooling/CMakeLists.txt
+++ cfe/trunk/unittests/Tooling/CMakeLists.txt
@@ -31,6 +31,7 @@
   RecursiveASTVisitorTests/CXXOperatorCallExprTraverser.cpp
   RecursiveASTVisitorTests/DeclRefExpr.cpp
   RecursiveASTVisitorTests/ImplicitCtor.cpp
+  RecursiveASTVisitorTests/ImplicitCtorInitializer.cpp
   RecursiveASTVisitorTests/InitListExprPostOrder.cpp
   RecursiveASTVisitorTests/InitListExprPostOrderNoQueue.cpp
   RecursiveASTVisitorTests/InitListExprPreOrder.cpp
Index: cfe/trunk/unittests/Tooling/RecursiveASTVisitorTests/ImplicitCtorInitializer.cpp
===================================================================
--- cfe/trunk/unittests/Tooling/RecursiveASTVisitorTests/ImplicitCtorInitializer.cpp
+++ cfe/trunk/unittests/Tooling/RecursiveASTVisitorTests/ImplicitCtorInitializer.cpp
@@ -0,0 +1,57 @@
+//=- unittest/Tooling/RecursiveASTVisitorTests/ImplicitCtorInitializer.cpp -=//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "TestVisitor.h"
+
+using namespace clang;
+
+namespace {
+
+class CXXCtorInitializerVisitor
+    : public ExpectedLocationVisitor<CXXCtorInitializerVisitor> {
+public:
+  CXXCtorInitializerVisitor(bool VisitImplicitCode)
+      : VisitImplicitCode(VisitImplicitCode) {}
+
+  bool shouldVisitImplicitCode() const { return VisitImplicitCode; }
+
+  bool TraverseConstructorInitializer(CXXCtorInitializer *Init) {
+    if (!Init->isWritten())
+      VisitedImplicitInitializer = true;
+    Match("initializer", Init->getSourceLocation());
+    return ExpectedLocationVisitor<
+        CXXCtorInitializerVisitor>::TraverseConstructorInitializer(Init);
+  }
+
+  bool VisitedImplicitInitializer = false;
+
+private:
+  bool VisitImplicitCode;
+};
+
+// Check to ensure that CXXCtorInitializer is not visited when implicit code
+// should not be visited and that it is visited when implicit code should be
+// visited.
+TEST(RecursiveASTVisitor, CXXCtorInitializerVisitNoImplicit) {
+  for (bool VisitImplCode : {true, false}) {
+    CXXCtorInitializerVisitor Visitor(VisitImplCode);
+    Visitor.ExpectMatch("initializer", 7, 17);
+    EXPECT_TRUE(Visitor.runOver(R"cpp(
+        class A {};
+        class B : public A {
+          B() {};
+        };
+        class C : public A {
+          C() : A() {}
+        };
+      )cpp",
+                                CXXCtorInitializerVisitor::Lang_CXX));
+    EXPECT_EQ(Visitor.VisitedImplicitInitializer, VisitImplCode);
+  }
+}
+} // end anonymous namespace