MODULE TByteBuf;
(* gm2 compatibility: a scalar actual for an ARRAY OF BYTE formal is
   wrapped as a stack byte-buffer descriptor, so HIGH = SIZE(actual)-1
   for value formals, and a VAR formal accepts a scalar too. *)
FROM SYSTEM IMPORT BYTE;
VAR ExitCode : INTEGER;

PROCEDURE bytes (b : ARRAY OF BYTE; s : CARDINAL);
BEGIN
  IF HIGH(b) = s - 1 THEN INC(ExitCode, 20) END
END bytes;

PROCEDURE vbytes (VAR b : ARRAY OF BYTE);
BEGIN
  IF HIGH(b) >= 0 THEN INC(ExitCode, 22) END
END vbytes;

VAR i : INTEGER; c : CHAR;
BEGIN
  ExitCode := 0;
  bytes(i, SIZE(i));
  bytes(c, SIZE(c));
  vbytes(i)
END TByteBuf.