Kind variables not allowed in type family instance declarations
I am trying to create a kind-indexed type family, but I cannot use kind variables in my kind annotations:
{-# LANGUAGE PolyKinds, TypeFamilies, DataKinds #-}
type family KindFam a
type instance KindFam (a :: *) = Int
type instance KindFam (a :: Bool) = Bool
type instance KindFam (a :: Maybe k) = Char -- doesn't workTrac metadata
| Trac field | Value |
|---|---|
| Version | 7.5 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (Type checker) |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |