[PATCH] Expose LambdaIntroducer::DefaultLoc in the AST's LambdaExpr.

[James Dennett]

  Add a RecursiveASTVisitor-based test.

  My hope is that this will be replaced by something better.

http://llvm-reviews.chandlerc.com/D1192

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1192?vs=2929&id=2930#toc

Files:
  unittests/Tooling/RecursiveASTVisitorTest.cpp

Index: unittests/Tooling/RecursiveASTVisitorTest.cpp
===================================================================
--- unittests/Tooling/RecursiveASTVisitorTest.cpp
+++ unittests/Tooling/RecursiveASTVisitorTest.cpp
@@ -102,7 +102,19 @@
     return PendingBodies.empty();
   }
 private:
-  std::stack<LambdaExpr *> PendingBodies; 
+  std::stack<LambdaExpr *> PendingBodies;
+};
+
+// Matches the (optional) capture-default of a lambda-introducer.
+class LambdaDefaultCaptureVisitor
+  : public ExpectedLocationVisitor<LambdaDefaultCaptureVisitor> {
+public:
+  bool VisitLambdaExpr(LambdaExpr *Lambda) {
+    if (Lambda->getCaptureDefault() != LCD_None) {
+      Match("", Lambda->getCaptureDefaultLoc());
+    }
+    return true;
+  }
 };
 
 class TemplateArgumentLocTraverser
@@ -503,4 +515,11 @@
   EXPECT_TRUE(Visitor.allBodiesHaveBeenTraversed());
 }
 
+TEST(RecursiveASTVisitor, HasCaptureDefaultLoc) {
+  LambdaDefaultCaptureVisitor Visitor;
+  Visitor.ExpectMatch("", 1, 20);
+  EXPECT_TRUE(Visitor.runOver("void f() { int a; [=]{a;}; }",
+                              LambdaDefaultCaptureVisitor::Lang_CXX11));
+}
+
 } // end namespace clang
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