prog.d(5): Error: identifier 'a' is not defined
prog.d(5): Error: a is used as a type
prog.d(5): Error: cannot have parameter of type void
prog.d(5): Error: identifier 'b' is not defined
prog.d(5): Error: b is used as a type
prog.d(5): Error: cannot have parameter of type void
prog.d(5): Error: cannot have parameter of type void
prog.d(5): Error: cannot have parameter of type void
prog.d(6): Error: cannot implicitly convert expression (3) of type int to void
prog.d(6): Error: cannot implicitly convert expression (5) of type int to void