gcc/testsuite/g++.dg/parse/crash21.C - gcc - Git at Google

 namespace N
 {
   struct A; // { dg-message "previous declaration" }
 }

 template<int I>
 struct N::A {}; // { dg-error "redeclared" }
	namespace N
	{
	struct A; // { dg-message "previous declaration" }
	}

	template<int I>
	struct N::A {}; // { dg-error "redeclared" }