is_base_of_diagnostic.C « ext « g++.dg « testsuite « gcc - cbb-gcc-4.6.4 - compiler building blocks: cbb-gcc-4.6.4: including full support for the midipix targets

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class A
{ };

class B;

union C
{ };

union D;

void f()
{
  __is_base_of(A, B);  // { dg-error "incomplete type" }
  __is_base_of(C, D);  
}