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|
(* TEST
expect;
*)
type z
type 'a s
type _ nat =
| Nz : z -> z nat
| Nss : 'd nat -> 'd s s nat
| Ns : 'a nat -> 'a s nat
;;
[%%expect{|
type z
type 'a s
Lines 3-6, characters 0-27:
3 | type _ nat =
4 | | Nz : z -> z nat
5 | | Nss : 'd nat -> 'd s s nat
6 | | Ns : 'a nat -> 'a s nat
Error: In the GADT constructor
Nss : 'd nat -> 'd s s nat
the type variable 'd cannot be deduced from the type parameters.
|}];;
type z
type 'a s
type _ nat = ..
type _ nat += Nz : z -> z nat
type _ nat += Nss : 'd nat -> 'd s s nat
;;
[%%expect{|
type z
type 'a s
type _ nat = ..
type _ nat += Nz : z -> z nat
Line 5, characters 0-40:
5 | type _ nat += Nss : 'd nat -> 'd s s nat
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: In the extension constructor
type _ nat += Nss : 'd nat -> 'd s s nat
the type variable 'd cannot be deduced from the type parameters.
|}];;
type 'any any = int
type _ t = ..
type 'b t += A: 'b -> 'b any t
[%%expect{|
type 'any any = int
type _ t = ..
Line 3, characters 0-30:
3 | type 'b t += A: 'b -> 'b any t
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: In the extension constructor
type 'b t += A : 'b -> 'b any t
the type variable 'b cannot be deduced from the type parameters.
|}]
|
