Self quantification in GADT data declarations
GHC hangs on this (it was panicking on the same code before : https://github.com/goldfirere/ghc/issues/56(https://github.com/goldfirere/ghc/issues/56) :
{-# LANGUAGE GADTs, TypeInType #-}
import Data.Kind
data A :: Type where
B :: forall (a :: A). AI guess the typechecker tries to infer the kind of A from the type of the constructors and hangs. Maybe recursive occurrences of a type as a kind in its constructors should only be allowed when its kind signature is specified and can be used to typecheck the constructors.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.0.1-rc2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
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| Blocking | |
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