ISO Pascal reference manual

*ERROR 101 -- parameters must be defined here
Appendix A
The declaration of a formal parameter is expected here. The common cause
for this message is a spurious semicolon separating formal parameters.
PROGRAM fail;
PROCEDURE thing(x : integer; ; z : real);
BEGIN [nothing here 1}
END;
BEGIN
END.
*ERROR 102 -- the parameters required by were defined in a previous
FORWARD declaration and must not be repeated here
When a procedure or function is declared as being FORWARD the
parameters it requires must be specified at that point. These parameters
must not be specified again when the actual definition of the procedure or
function is made.
PROGRAM fail;
PROCEDURE thing(x : integer); FORWARD;
PROCEDURE thing(x : integer); (credible, but wrong}
BEGIN
END;
BEGIN
END.
*ERROR 103 -- a parameter in brackets is required here
A procedure or function has been invoked with no parameters when its
definition required at least one.
PROGRAM fail;
VAR x : integer;
BEGIN
x := ABS; [ABS needs one parameter}
END.
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