Listing: 1 MODULE PFib; 2 VAR ExitCode : INTEGER; 3 PROCEDURE Fib(n : INTEGER) : INTEGER; 4 BEGIN 5 IF n <= 1 THEN RETURN n ELSE RETURN Fib(n - 1) + Fib(n - 2) END 6 END Fib; 7 BEGIN 8 ExitCode := Fib(10) 9 END PFib. 0 errors