Fix a De Bruijn bug in the computation of term relevance in the kernel.

Opening up a lambda should always lift the substitution attached to it.

1 files changed, 8 insertions, 0 deletions

diff --git a/test-suite/bugs/closed/bug_10904.v b/test-suite/bugs/closed/bug_10904.v
new file mode 100644
index 0000000000..32b25ff726
--- /dev/null
+++ b/test-suite/bugs/closed/bug_10904.v
@@ -0,0 +1,8 @@
+Definition a := fun (P:SProp) (p:P) => p.
+
+Lemma foo : (let k := a in let k' := a in fun (x:nat) y => x) = (let k := a in fun x y => y).
+Proof.
+  Fail reflexivity.
+  match goal with |- ?l = _ => exact_no_check (eq_refl l) end.
+Fail Qed.
+Abort.