Fix #8881: validate fails to use inductive equivalence in case_info

See also 55dbe8e2fa7ed2053ecd54140f6bcbdf31981e0b

1 files changed, 23 insertions, 0 deletions

diff --git a/test-suite/coqchk/bug_8881.v b/test-suite/coqchk/bug_8881.v
new file mode 100644
index 0000000000..dfc209b318
--- /dev/null
+++ b/test-suite/coqchk/bug_8881.v
@@ -0,0 +1,23 @@
+
+(* Check use of equivalence on inductive types (bug #1242) *)
+
+Module Type ASIG.
+  Inductive t : Set := a | b : t.
+  Definition f := fun x => match x with a => true | b => false end.
+End ASIG.
+
+Module Type BSIG.
+  Declare Module A : ASIG.
+  Definition f := fun x => match x with A.a => true | A.b => false end.
+End BSIG.
+
+Module C (A : ASIG) (B : BSIG with Module A:=A).
+
+  (* Check equivalence is considered in "case_info" *)
+  Lemma test : forall x, A.f x = B.f x.
+  Proof.
+    intro x. unfold B.f, A.f.
+    destruct x; reflexivity.
+  Qed.
+
+End C.