gcc/testsuite/gcc.dg/c2x-old-style-definition-1.c


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/* Test old-style function definitions not in C2x: warnings.  */
/* { dg-do compile } */
/* { dg-options "-std=c2x" } */

void
f (x) /* { dg-warning "old-style function definition" } */
     int x;
{
}