implement PR4451, improving error recovery for a mistaken : where a :: was

intended.  On the first testcase in the bug, we now produce:

cxx-decl.cpp:12:2: error: unexpected ':' in nested name specifier
y:a a2;
 ^
 ::

instead of:

t.cc:8:1: error: C++ requires a type specifier for all declarations
x:a a2;
^
t.cc:8:2: error: invalid token after top level declarator
x:a a2;
 ^
 ;
t.cc:9:11: error: use of undeclared identifier 'a2'
x::a a3 = a2;
          ^

llvm-svn: 90713

1 files changed, 21 insertions, 0 deletions

diff --git a/clang/test/Parser/cxx-decl.cpp b/clang/test/Parser/cxx-decl.cpp
index 3fa284282ad..8c5ab6a55d5 100644
--- a/clang/test/Parser/cxx-decl.cpp
+++ b/clang/test/Parser/cxx-decl.cpp
@@ -1,3 +1,24 @@
 // RUN: clang-cc -verify -fsyntax-only %s
 
 int x(*g); // expected-error {{use of undeclared identifier 'g'}}
+
+
+// PR4451 - We should recover well from the typo of '::' as ':' in a2.
+namespace y {
+  struct a { };  
+}
+
+y::a a1;
+y:a a2;  // expected-error {{unexpected ':' in nested name specifier}}
+y::a a3 = a2;
+
+// Some valid colons:
+void foo() {
+y:  // label
+  y::a s;
+  
+  int a = 4;
+  a = a ? a : a+1;
+}
+
+struct b : y::a {};
\ No newline at end of file