Improve diagnosis of unknown template name.

When an undeclared identifier in a context that requires a type is followed by
'<', only look for type templates when typo-correcting, tweak the diagnostic
text to say that a template name (not a type name) was undeclared, and parse
the template arguments when recovering from the error.

llvm-svn: 302732

1 files changed, 9 insertions, 2 deletions

diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index 1465d21ac5e..4ccee74eaa9 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -2577,9 +2577,9 @@ bool Parser::ParseImplicitInt(DeclSpec &DS, CXXScopeSpec *SS,
   // and attempt to recover.
   ParsedType T;
   IdentifierInfo *II = Tok.getIdentifierInfo();
+  bool IsTemplateName = getLangOpts().CPlusPlus && NextToken().is(tok::less);
   Actions.DiagnoseUnknownTypeName(II, Loc, getCurScope(), SS, T,
-                                  getLangOpts().CPlusPlus &&
-                                      NextToken().is(tok::less));
+                                  IsTemplateName);
   if (T) {
     // The action has suggested that the type T could be used. Set that as
     // the type in the declaration specifiers, consume the would-be type
@@ -2604,6 +2604,13 @@ bool Parser::ParseImplicitInt(DeclSpec &DS, CXXScopeSpec *SS,
   DS.SetRangeEnd(Tok.getLocation());
   ConsumeToken();
 
+  // Eat any following template arguments.
+  if (IsTemplateName) {
+    SourceLocation LAngle, RAngle;
+    TemplateArgList Args;
+    ParseTemplateIdAfterTemplateName(true, LAngle, Args, RAngle);
+  }
+
   // TODO: Could inject an invalid typedef decl in an enclosing scope to
   // avoid rippling error messages on subsequent uses of the same type,
   // could be useful if #include was forgotten.