#5695: Ghci type inference to [()] -> String, when should be Show a => [a] ->
Striing
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Reporter: guest | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 7.0.3
Resolution: invalid | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: GHC rejects valid program | Difficulty: Unknown
Testcase: | Blockedby:
Blocking: | Related:
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Changes (by simonmar):
* status: new => closed
* difficulty: => Unknown
* resolution: => invalid
Comment:
This is working correctly. To get the result you expect, either put the
type signature on `test` itself:
{{{
let test = intercalate ";" . map (\a -> "Id=" ++ show a); test :: Show a
=> [a] -> String
}}}
or `:set -XNoMonomorphismRestriction`. Maybe someday we'll turn off the
MR by default.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5695#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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