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Fix upper bound on non-strict while #941

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Merged
strub merged 1 commit into from
Mar 16, 2026
+6 −1
Merged

Fix upper bound on non-strict while #941

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7 changes: 6 additions & 1 deletion src/phl/ecPhlWhile.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -201,7 +201,7 @@ let t_bdhoare_while_rev_r inv tc =
(* -------------------------------------------------------------------- *)
(* Rule for = or >= *)

let t_bdhoare_while_rev_geq_r inv vrnt k (eps: ss_inv) tc =
let t_bdhoare_while_rev_geq_r inv vrnt (k: ss_inv) (eps: ss_inv) tc =
let env, hyps, _ = FApi.tc1_eflat tc in

let bhs = tc1_as_bdhoareS tc in
Expand All @@ -221,6 +221,11 @@ let t_bdhoare_while_rev_geq_r inv vrnt k (eps: ss_inv) tc =
"The variant decreasing rate lower-bound cannot "
"depend on variables written by the loop body";

if not (PV.indep env (s_write env lp_body) (PV.fv env (EcMemory.memory mem) k.inv)) then
tc_error !!tc
"The variant upper bound cannot depend on "
"variables written by the loop body";

check_single_stmt tc rem_s;

let lp_guard = ss_inv_of_expr m lp_guard_exp in
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