Fix an assertion when code-completing, rdar://9288730 & http://llvm.org/PR9728.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130042 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Parse/ParseExprCXX.cpp

@@ -161,7 +161,12 @@ bool Parser::ParseOptionalCXXScopeSpecifier(CXXScopeSpec &SS,
         // Code completion for a nested-name-specifier, where the code
         // code completion token follows the '::'.
         Actions.CodeCompleteQualifiedId(getCurScope(), SS, EnteringContext);
-        ConsumeCodeCompletionToken();
+        SourceLocation ccLoc = ConsumeCodeCompletionToken();
+        // Include code completion token into the range of the scope otherwise
+        // when we try to annotate the scope tokens the dangling code completion
+        // token will cause assertion in
+        // Preprocessor::AnnotatePreviousCachedTokens.
+        SS.setEndLoc(ccLoc);
       }
     }
 

test/CodeCompletion/PR9728.cpp

@@ -0,0 +1,9 @@
+namespace N {
+struct SFoo;
+}
+
+struct brokenfile_t {
+  brokenfile_t (N::
+  // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:6:20 %s -o - | FileCheck %s
+  // CHECK: SFoo
+