M2compiler-V3/docs/wip/local-array-bug.mod

MODULE local_array_bug;
(* Repro: a local ARRAY inside a PROCEDURE is miscompiled by V3.
   Expected exit 60; observed 1 (as of v3-ast-slice5, 2026-10-03).
   Found while self-hosting the two-phase statement AST (IfStat used a
   local ARRAY OF AST.Node); moved to module scope to keep the fixpoint
   green.  Module-level arrays work; local ones do not. *)

VAR ExitCode : INTEGER;

PROCEDURE P;
  VAR a : ARRAY [0..3] OF INTEGER; i : INTEGER;
BEGIN
  i := 0;
  WHILE i < 4 DO a[i] := i * 10; INC(i) END;
  ExitCode := a[0] + a[1] + a[2] + a[3]   (* 0+10+20+30 = 60 *)
END P;

BEGIN P END local_array_bug.