/in/foo.c: In function 'gcd':
/in/foo.c:4:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
 {
 ^
/in/foo.c:16:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
 {
 ^
/in/foo.c:27:1: error: expected '{' at end of input
 }
 ^
/in/foo.c:27:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^