/in/foo.c:2:1: error: expected ',' or ';' before 'int'
 int x = 1
 ^~~
/in/foo.c:5:5: warning: data definition has no type or storage class
     x = y;
     ^
/in/foo.c:5:5: warning: type defaults to 'int' in declaration of 'x' [-Wimplicit-int]
/in/foo.c:5:9: error: 'y' undeclared here (not in a function)
     x = y;
         ^
/in/foo.c:6:7: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
     i ++
       ^~