1 files changed, 41 insertions, 0 deletions
diff --git a/unittests/Tooling/RecursiveASTVisitorTests/Class.cpp b/unittests/Tooling/RecursiveASTVisitorTests/Class.cpp
new file mode 100644
index 0000000000000..666c924d1acf3
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+++ b/unittests/Tooling/RecursiveASTVisitorTests/Class.cpp
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+//===- unittest/Tooling/RecursiveASTVisitorTests/Class.cpp ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "TestVisitor.h"
+
+using namespace clang;
+
+namespace {
+
+// Checks for lambda classes that are not marked as implicitly-generated.
+// (There should be none.)
+class ClassVisitor : public ExpectedLocationVisitor<ClassVisitor> {
+public:
+  ClassVisitor() : SawNonImplicitLambdaClass(false) {}
+  bool VisitCXXRecordDecl(CXXRecordDecl* record) {
+    if (record->isLambda() && !record->isImplicit())
+      SawNonImplicitLambdaClass = true;
+    return true;
+  }
+
+  bool sawOnlyImplicitLambdaClasses() const {
+    return !SawNonImplicitLambdaClass;
+  }
+
+private:
+  bool SawNonImplicitLambdaClass;
+};
+
+TEST(RecursiveASTVisitor, LambdaClosureTypesAreImplicit) {
+  ClassVisitor Visitor;
+  EXPECT_TRUE(Visitor.runOver("auto lambda = []{};", ClassVisitor::Lang_CXX11));
+  EXPECT_TRUE(Visitor.sawOnlyImplicitLambdaClasses());
+}
+
+} // end anonymous namespace