Don't crash on 'decltype(auto)::'. Rather than treating it as a meaningless

nested-name-specifier (as the standard appears to require), treat it as the
type specifier 'decltype(auto)' followed by a nested-name-specifier starting
with '::'.

llvm-svn: 294506

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/cxx1y-deduced-return-type.cpp b/clang/test/SemaCXX/cxx1y-deduced-return-type.cpp
index 593ec48b439..a061cf4ddb7 100644
--- a/clang/test/SemaCXX/cxx1y-deduced-return-type.cpp
+++ b/clang/test/SemaCXX/cxx1y-deduced-return-type.cpp
@@ -385,6 +385,18 @@ namespace MemberTemplatesWithDeduction {
 }
 }
 
+namespace NNS {
+  int n;
+  decltype(auto) i();
+  decltype(n) j();
+  struct X {
+    // We resolve a wording bug here: 'decltype(auto)::' should not be parsed
+    // as a nested-name-specifier.
+    friend decltype(auto) ::NNS::i();
+    friend decltype(n) ::NNS::j(); // expected-error {{not a class}}
+  };
+}
+
 namespace CurrentInstantiation {
   // PR16875
   template<typename T> struct S {