gcc-4.9/gcc/testsuite/gcc.dg/uninit-13.c


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/* { dg-do compile } */
/* { dg-options "-O -Wuninitialized" } */

typedef _Complex float C;
C foo()
{
  C f;
  __imag__ f = 0;	/* { dg-warning "is used" "unconditional" } */
  return f;
}