#7488: Promotion of newtypes
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Reporter: dreixel | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.7 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Blockedby:
Blocking: | Related:
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{{{
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE KindSignatures #-}
{-# LANGUAGE GADTs #-}
newtype A = A Int
data B (x :: A)
}}}
The program above raises the error: `A of kind * is not promotable`. The
program compiles fine if we declare `A` using `data` instead of `newtype`.
Is there a good reason to prevent promotion of newtypes?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7488>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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