Merge PR #942: solving b1859

1 files changed, 20 insertions, 0 deletions

diff --git a/test-suite/bugs/closed/1859.v b/test-suite/bugs/closed/1859.v
new file mode 100644
index 000000000..43acfe4ba
--- /dev/null
+++ b/test-suite/bugs/closed/1859.v
@@ -0,0 +1,20 @@
+Require Import Ring.
+Require Import ArithRing.
+
+Ltac ring_simplify_neq :=
+  match goal with
+  | [ H: ?X <> ?Y |- _ ] => progress ring_simplify X Y in H
+  end.
+
+Lemma toto : forall x y, x*1 <> y*1 -> y*1 <> x*1 -> x<>y.
+Proof.
+  intros.
+  ring_simplify_neq.
+  ring_simplify_neq.
+  (* make sure ring_simplify has simplified both hypotheses *)
+  match goal with
+  | [ H: context[_*1] |- _ ] => fail 1
+  | _ => idtac
+  end.
+  auto.
+Qed.