/in/foo.c:1:1: warning: data definition has no type or storage class
    1 | upper_count = 0
      | ^~~~~~~~~~~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'upper_count' [-Wimplicit-int]
/in/foo.c:2:1: error: expected ',' or ';' before 'lower_count'
    2 | lower_count = 0
      | ^~~~~~~~~~~