PL0-GNU-M2/semerr4.pl5

VAR m : array1;
VAR n : arrayx;				(* arrayx ist nicht definiert*)

CONST CALL = 33;

PROCEDURE read;
VAR i : INTEGER;
VAR x : array0;
BEGIN
    i := 1;
    WHILE i <= 7 DO
       ?x[i];
       i := i + 1
    END DO;
    m[2] := x
END;

TYPE array1 = ARRAY 3 OF array0;

PROCEDURE writeReverse;
VAR x : array0;
VAR i : INTEGER;
BEGIN
   ;;;;;;;;;;;;;;;;;;;;;
   ;; x := m[2];      ;;		
   ;; i := 7;	      ;;
   ;; WHILE i >= 1 DO ;;
   ;;    !x[i];       ;;
   ;;    i := i - 1   ;;
   ;; END DO          ;;
   ll;;;;;;;;;;;;;;;;;kk		(* undeklarierte Prozeduren *)
END;

TYPE array0 = ARRAY 7 OF INTEGER;
TYPE arrayO = ARRAY 7 OF BOOLEAN;

VAR x : arrayO;

BEGIN
   !CALL[3];				(* indizierte Konstante *)
   read;
   IF NOT ODD m[2][1] THEN
      writeReverse
   ELSE
      !m[TRUE][x[3]]		        (* beide Indices BOOLEAN *)
   END IF
END.