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