Implementing lazy matching over terms.

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/matching.v b/tests/matching.v
new file mode 100644
index 0000000000..d21c505cdf
--- /dev/null
+++ b/tests/matching.v
@@ -0,0 +1,17 @@
+Require Import Ltac2.Ltac2 Ltac2.Notations.
+
+Goal True -> False.
+Proof.
+Fail
+let b := { contents := true } in
+let f c :=
+  match b.(contents) with
+  | true => Message.print (Message.of_constr c); b.(contents) := false; fail
+  | false => ()
+  end
+in
+(** This fails because the matching is not allowed to backtrack once
+    it commits to a branch*)
+lazy_match! '(nat -> bool) with context [?a] => f a end.
+lazy_match! Control.goal () with ?a -> ?b => Message.print (Message.of_constr b) end.
+Abort.