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). A
I 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 | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |