/in/foo.c:1:1: error: unknown type name 'var'
 var a,b:longint;
 ^~~
/in/foo.c:1:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
 var a,b:longint;
        ^
/in/foo.c:2:1: error: unknown type name 'begin'
 begin
 ^~~~~
/in/foo.c:3:5: warning: parameter names (without types) in function declaration
     readln(a,b);
     ^~~~~~
/in/foo.c:4:14: error: expected ')' before '+' token
     writeln(a+b);
              ^
/in/foo.c:5:4: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
 end.
    ^