Bug fixed by Hugo.

1 files changed, 57 insertions, 0 deletions

diff --git a/test-suite/bugs/closed/3388.v b/test-suite/bugs/closed/3388.v
new file mode 100644
index 000000000..782628049
--- /dev/null
+++ b/test-suite/bugs/closed/3388.v
@@ -0,0 +1,57 @@
+Inductive test : bool -> bool -> Type :=
+| test00 : test false false
+| test01 : test false true
+| test10 : test true false
+.
+
+(* This does not work *)
+Definition test_a (t : test true false) : test true false :=
+  match t with
+    | test10 => test10
+  end.
+
+(* The following definition shows that test_a SHOULD work *)
+Definition test_a_workaround (t : test true false) : test true false :=
+  match t with
+    | test10 => test10
+    | _ => tt
+  end.
+
+(* Surprisingly, this works *)
+Definition test_b (t : test false true) : test false true :=
+  match t with
+    | test01 => test01
+  end.
+
+
+(* This, too, works *)
+Definition test_c x (t : test false x) : test false x :=
+  match t with
+    | test00 => test00
+    | test01 => test01
+  end.
+
+Inductive test2 : bool -> bool -> Type :=
+| test201 : test2 false true
+| test210 : test2 true false
+| test211 : test2 true true
+.
+
+(* Now this works *)
+Definition test2_a (t : test2 true false) : test2 true false :=
+  match t with
+    | test210 => test210
+  end.
+
+(* Accordingly, this now fails *)
+Definition test2_b (t : test2 false true) : test2 false true :=
+  match t with
+    | test201 => test201
+  end.
+
+
+(* This, too, fails *)
+Definition test2_c x (t : test2 false x) : test2 false x :=
+  match t with
+    | test201 => test201
+  end.