#6030: Typeclass constraint should pick the OverloadedString type.
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Reporter: GregWeber | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.4.1
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by GregWeber):
ExtendedDefaultRules is good but not fully covering my use cases of data
types built of IsString, so I am still very interested in proposing
something here or improving ExtendedDefaultRules. The following does not
compile:
{{{
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ExtendedDefaultRules #-}
{-# LANGUAGE FlexibleInstances #-}
module Default (noDefault) where
import Data.Text as T
default (T.Text)
class NoDefault a where noDefault :: a -> [Text]
instance NoDefault [T.Text] where noDefault = id
main = print (noDefault ["Hello!"])
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6030#comment:6>
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