Fixing an evar leak in pattern-matching compilation (#3758).

1 files changed, 17 insertions, 0 deletions

diff --git a/test-suite/success/Cases-bug3758.v b/test-suite/success/Cases-bug3758.v
new file mode 100644
index 000000000..e48f45232
--- /dev/null
+++ b/test-suite/success/Cases-bug3758.v
@@ -0,0 +1,17 @@
+(* There used to be an evar leak in the to_nat example *)
+
+Require Import Coq.Lists.List.
+Import ListNotations.
+
+Fixpoint Idx {A:Type} (l:list A) : Type :=
+  match l with
+  | [] => False
+  | _::l => True + Idx l
+  end.
+
+Fixpoint to_nat {A:Type} (l:list A) (i:Idx l) : nat :=
+  match l,i with
+  |  [] , i => match i with end
+  | _::_, inl _ => 0
+  | _::l, inr i => S (to_nat l i)
+  end.