1  
       2  /* Forget to include any standard headers, all for built-in functions.
       3     Rely on -Wimplicit-function-declaration for fixit hints, not on
       4     -Wbuiltin-declaration-mismatch (which misses abs, isdigit, putchar).  */
       5  
       6  /* { dg-options "-fdiagnostics-show-caret -fdiagnostics-show-line-numbers -Wimplicit-function-declaration -Wno-builtin-declaration-mismatch" } */
       7  
       8  int
       9  foo (char *m, int i)
      10  {
      11    if (isdigit (m[0])) /* { dg-warning "implicit declaration of function" } */
      12    /* { dg-begin-multiline-output "" }
      13     11 |   if (isdigit (m[0]))
      14        |       ^~~~~~~
      15    +++ |+#include <ctype.h>
      16      1 | 
      17       { dg-end-multiline-output "" } */
      18      {
      19        return abs (i); /* { dg-warning "implicit declaration of function" } */
      20    /* { dg-begin-multiline-output "" }
      21     19 |       return abs (i);
      22        |              ^~~
      23    +++ |+#include <stdlib.h>
      24      1 | 
      25       { dg-end-multiline-output "" } */
      26      }
      27    else
      28      putchar (m[0]); /* { dg-warning "implicit declaration of function" } */
      29    /* { dg-begin-multiline-output "" }
      30     28 |     putchar (m[0]);
      31        |     ^~~~~~~
      32    +++ |+#include <stdio.h>
      33      1 | 
      34       { dg-end-multiline-output "" } */
      35    return i;
      36  }