llvm-gcc-4.2/gcc/testsuite/g++.dg/template/crash58.C

//PR 26938

template<int, int = 0> struct A;  // { dg-error "previous declaration" }

template<int> struct A            // { dg-error "template" }
{
  A();
};

A<0> a;                           // { dg-error "incomplete type" }