Commit be31a207 authored by Andrei Paskevich's avatar Andrei Paskevich

add one line of a useful comment

parent 526e31f6
......@@ -577,6 +577,7 @@ and bv_subst_unsafe m b =
(* remove from b.bv_vars the variables replaced by m *)
let s = Mvs.set_diff b.bv_vars m in
(* add to b.bv_vars the free variables added by m *)
(* if you are tempted to inline mult into some_plus, think better *)
let mult n s = if n = 1 then s else (fun i -> i * n) s in
let join _ n t s = Mvs.union some_plus (mult n t.t_vars) s in
let s = Mvs.fold2_inter join b.bv_vars m s in
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