/in/foo.c:1:3: error: stray '#' in program
  c#include <stdio.h>
   ^
/in/foo.c:1:2: error: unknown type name 'c'
  c#include <stdio.h>
  ^
/in/foo.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
  c#include <stdio.h>
            ^