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-rw-r--r--kernel/environ.ml4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/environ.ml b/kernel/environ.ml
index 9b18db78e..ae6817a76 100644
--- a/kernel/environ.ml
+++ b/kernel/environ.ml
@@ -228,7 +228,7 @@ let lookup_constructor_variables (ind,_) env =
let vars_of_global env constr =
match kind_of_term constr with
- Var id -> [id]
+ Var id -> Id.Set.singleton id
| Const kn -> lookup_constant_variables kn env
| Ind ind -> lookup_inductive_variables ind env
| Construct cstr -> lookup_constructor_variables cstr env
@@ -239,7 +239,7 @@ let global_vars_set env constr =
let acc =
match kind_of_term c with
| Var _ | Const _ | Ind _ | Construct _ ->
- List.fold_right Id.Set.add (vars_of_global env c) acc
+ Id.Set.union (vars_of_global env c) acc
| _ ->
acc in
fold_constr filtrec acc c