/in/foo.c:1:1: warning: data definition has no type or storage class
    1 | a,b=2,1
      | ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
/in/foo.c:1:3: warning: type defaults to 'int' in declaration of 'b' [-Wimplicit-int]
    1 | a,b=2,1
      |   ^
/in/foo.c:1:7: error: expected identifier or '(' before numeric constant
    1 | a,b=2,1
      |       ^