Don't infinite-loop if TryAnnotateCXXScopeToken fails to annotate but doesn't

signal an error.  This can happen even when the current token is '::' if
this is a ::new or ::delete expression.

This was an oversight in my recent parser refactor;  fixes PR 5825.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@97462 91177308-0d34-0410-b5e6-96231b3b80d8

Author: rjmccall

lib/Parse/ParseDecl.cpp

@@ -865,6 +865,8 @@ void Parser::ParseDeclarationSpecifiers(DeclSpec &DS,
           DS.SetTypeSpecError();
         goto DoneWithDeclSpec;
       }
+      if (Tok.is(tok::coloncolon)) // ::new or ::delete
+        goto DoneWithDeclSpec;
       continue;
 
     case tok::annot_cxxscope: {

test/Parser/cxx-decl.cpp

@@ -58,3 +58,7 @@ struct test4 {
   int y;
   int z  // expected-error {{expected ';' at end of declaration list}}
 };
+
+// PR5825
+struct test5 {};
+::new(static_cast<void*>(0)) test5; // expected-error {{expected unqualified-id}}