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
diff --git a/test/Parser/cxx-template-decl.cpp b/test/Parser/cxx-template-decl.cpp
index 5381377..79b04cf 100644
--- a/test/Parser/cxx-template-decl.cpp
+++ b/test/Parser/cxx-template-decl.cpp
@@ -5,10 +5,12 @@
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();