gcc-4.9/gcc/testsuite/gcc.dg/typedef-redecl.c


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/* Redeclaration of typedef (invalid but accepted in system headers)
   causes ICE; PR 13656.  Test case by Richard Sandiford <rsandifo@redhat.com>,
   reduced from glibc.  */

#include "typedef-redecl.h"
x a;