foo.c: In function 'main':
foo.c:9:16: warning: zero-length gnu_printf format string [-Wformat-zero-length]
    9 |         printf("");
      |                ^~
foo.c:11:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   11 |         for(x=2;x<y;x++);
      |         ^~~
foo.c:12:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   12 |         {
      |         ^

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