Reinstate fixpoint refolding in [cbn], deactivated by mistake.

Add a test-suite file to be sure we won't regress silently.

1 files changed, 18 insertions, 0 deletions

diff --git a/test-suite/success/cbn.v b/test-suite/success/cbn.v
new file mode 100644
index 000000000..6aeb05f54
--- /dev/null
+++ b/test-suite/success/cbn.v
@@ -0,0 +1,18 @@
+(* cbn is able to refold mutual recursive calls *)
+
+Fixpoint foo (n : nat) :=
+  match n with
+  | 0 => true
+  | S n => g n
+  end
+with g (n : nat) : bool :=
+  match n with
+  | 0 => true
+  | S n => foo n
+  end.
+Goal forall n, foo (S n) = g n.
+  intros. cbn.
+  match goal with
+    |- g _ = g _ => reflexivity
+  end.
+Qed.
\ No newline at end of file