Fix #6956: Uncaught exception in bytecode compilation

We also make the code of [compact] in kernel/univ.ml a bit clearer.

1 files changed, 13 insertions, 0 deletions

diff --git a/test-suite/bugs/closed/6956.v b/test-suite/bugs/closed/6956.v
new file mode 100644
index 000000000..ee21adbbf
--- /dev/null
+++ b/test-suite/bugs/closed/6956.v
@@ -0,0 +1,13 @@
+(** Used to trigger an anomaly with VM compilation *)
+
+Set Universe Polymorphism.
+
+Inductive t A : nat -> Type :=
+| nil : t A 0
+| cons : forall (h : A) (n : nat), t A n -> t A (S n).
+
+Definition case0 {A} (P : t A 0 -> Type) (H : P (nil A)) v : P v :=
+match v with
+| nil _ => H
+| _ => fun devil => False_ind (@IDProp) devil
+end.