foo.c: In function 'main':
foo.c:4:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'return'
foo.c:6:1: error: expected declaration or statement at end of input
foo.c:3:5: warning: unused variable 'a' [-Wunused-variable]
foo.c:6:1: warning: control reaches end of non-void function [-Wreturn-type]