foo.c:3:1: warning: data definition has no type or storage class
    3 | a=1024
      | ^
foo.c:3:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
foo.c:4:1: error: expected ',' or ';' before 'b'
    4 | b=30
      | ^

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