ghc master requires -XTypeInType where 8.2.1 does not
This was found while building https://hackage.haskell.org/package/foundation with ghc head.
The following code is reduced from Basement.Primitive.Error:
{-# LANGUAGE MagicHash, PolyKinds, RankNTypes #-}
module FoundationRegression where
import GHC.Prim
import GHC.Types (RuntimeRep)
error :: forall (r :: RuntimeRep) . forall (a :: TYPE r) . String -> a
error s = raise# undefined
This compiles works with 8.2.1, but fails on master:
$ /opt/ghc/8.2.1/bin/ghc -c FoundationRegression.hs
$ /opt/ghc/head/bin/ghc -c FoundationRegression.hs
FoundationRegression.hs:7:17: error:
Variable ‘r’ used as both a kind and a type
Did you intend to use TypeInType?
|
7 | error :: forall (r :: RuntimeRep) . forall (a :: TYPE r) . String -> a
| ^^^^^^^^^^^^^^^^^
After adding a TypeInType language pragma the program is accepted.
Trac metadata
Trac field | Value |
---|---|
Version | 8.3 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Type checker) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |