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|
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.
|
