Diagnose declarations that don't declare anything, and fix PR3020.

Examples:
int;
typedef int;

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61454 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 4 deletions

diff --git a/test/Parser/cxx-template-decl.cpp b/test/Parser/cxx-template-decl.cpp
index 53813776e7..79b04cfc79 100644
--- a/test/Parser/cxx-template-decl.cpp
+++ b/test/Parser/cxx-template-decl.cpp
@@ -5,10 +5,12 @@ export class foo { };   // expected-error {{expected template}}
 template  x;            // expected-error {{expected '<' after 'template'}}
 export template x;      // expected-error {{expected '<' after 'template'}} \
                         // expected-note {{exported templates are unsupported}}
-template < ;            // expected-error {{parse error}}
-template <template X> ; // expected-error {{expected '<' after 'template'}}
-template <template <typename> > ;       // expected-error {{expected 'class' before '>'}}
-template <template <typename> Foo> ;    // expected-error {{expected 'class' before 'Foo'}}
+// See Sema::ParsedFreeStandingDeclSpec about the double diagnostic. This is
+// because ParseNonTypeTemplateParameter starts parsing a DeclSpec.
+template < ;            // expected-error {{parse error}} expected-error {{declaration does not declare anything}}
+template <template X> struct Err1; // expected-error {{expected '<' after 'template'}}
+template <template <typename> > struct Err2;       // expected-error {{expected 'class' before '>'}}
+template <template <typename> Foo> struct Err3;    // expected-error {{expected 'class' before 'Foo'}}
 
 // Template function declarations
 template <typename T> void foo();