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-rw-r--r--theories/FSets/FMapFacts.v5
1 files changed, 3 insertions, 2 deletions
diff --git a/theories/FSets/FMapFacts.v b/theories/FSets/FMapFacts.v
index 9fef1dc63..dc33167a6 100644
--- a/theories/FSets/FMapFacts.v
+++ b/theories/FSets/FMapFacts.v
@@ -1871,8 +1871,9 @@ Module OrdProperties (M:S).
find_mapsto_iff, (H0 t0), <- find_mapsto_iff,
add_mapsto_iff by (auto with *).
unfold O.eqke, O.ltk; simpl.
- destruct (E.compare t0 x); intuition.
- elim H; exists e0; apply MapsTo_1 with t0; auto.
+ destruct (E.compare t0 x); intuition; try fold (~E.eq x t0); auto.
+ - elim H; exists e0; apply MapsTo_1 with t0; auto.
+ - fold (~E.lt t0 x); auto.
Qed.
Lemma elements_Add_Above : forall m m' x e,