Properly thread let-bindings in Funind principle construction.

Fixes #11846: Funind fails to generate principles for terms with let bindings.

1 files changed, 16 insertions, 0 deletions

diff --git a/test-suite/bugs/closed/bug_11846.v b/test-suite/bugs/closed/bug_11846.v
new file mode 100644
index 0000000000..53517e7703
--- /dev/null
+++ b/test-suite/bugs/closed/bug_11846.v
@@ -0,0 +1,16 @@
+Require Import FunInd.
+
+Inductive tree : Type :=
+| Node : unit -> tree.
+
+Definition height (s : tree) : unit :=
+match s with
+| Node h => h
+end.
+
+Definition bal : forall l, let h := height l in tree := fun l =>
+  let h := height l in
+  Node h.
+
+Set Warnings "+all".
+Functional Scheme bal_ind := Induction for bal Sort Prop.