/in/foo.c:1:1: warning: data definition has no type or storage class
    1 | PI=3,1415
      | ^~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'PI' [-Wimplicit-int]
/in/foo.c:1:6: error: expected identifier or '(' before numeric constant
    1 | PI=3,1415
      |      ^~~~