Hi, Am Montag, den 09.09.2013, 13:25 -0400 schrieb Richard Eisenberg: > According to the original post and the comments on #5498 > (http://ghc.haskell.org/trac/ghc/ticket/5498), breaking through > abstraction is another reason for keeping GND outside of Safe Haskell. > I'm worried that the same concern would affect newtype coercions given > the current proposal.
an easy fix would be to disallow coerce in Safe Haskell.
A similarly easy fix would be to add the requirements that constructors
have to be in scope when generating the
instance Coercible a b => Coercible (D a) (D b)
rule in Safe Haskell code. Although that might cripple the feature too
much, but not more than not having the feature at all.
I think the latter is a good compromise for the non-advertised release.
Greetings,
Joachim
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Joachim “nomeata” Breitner
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