MODULE Gap06FwdSetConst;
(* NOT legal Modula-2: a set CONST names `tab` (later CONST) and
   `CharSet` (later TYPE).  Declaration before use is required; V3
   correctly rejects it.  Class: decl-order (gm2 leniency).
   Corpus: setoverflow.
   V3: undeclared identifier. *)
CONST ws = CharSet{tab, ' '};
      tab = 9;
TYPE CharSet = SET OF CHAR;
VAR s : CharSet;
BEGIN s := ws END Gap06FwdSetConst.