#1121: Error message "Expecting a function type, but found `w_a1Kh'"
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Reporter: [EMAIL PROTECTED] | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler (Type checker) | Version: 6.4.2
Severity: normal | Resolution: wontfix
Keywords: | Difficulty: Unknown
Testcase: | Architecture: x86
Os: Linux |
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Changes (by simonpj):
* resolution: => wontfix
* status: new => closed
Old description:
> When compiling with GHC or loading into GHCi the following module I get a
> strange error:
>
> module Bla where
>
> bla :: String -> String
> bla x = unwords $ [ ('#':) ]
>
> The error is:
>
> Bug.hs:4:20:
> Expecting a function type, but found `w_a1bp'
> Expected type: String
> Inferred type: [Char] -> [Char]
> In the expression: ('#' :)
> In the list element: ('#' :)
>
> Writing the function as:
>
> bla = words [ ('#':) ]
>
> produces the correct error message with [Char] instead of `w_a1bp'.
>
> I was doing this with GHC-6.4.2 on Ubuntu with a 2.6.17 kernel.
New description:
When compiling with GHC or loading into GHCi the following module I get a
strange error:
{{{
module Bla where
bla :: String -> String
bla x = unwords $ [ ('#':) ]
}}}
The error is:
{{{
Bug.hs:4:20:
Expecting a function type, but found `w_a1bp'
Expected type: String
Inferred type: [Char] -> [Char]
In the expression: ('#' :)
In the list element: ('#' :)
}}}
Writing the function as:
{{{
bla = words [ ('#':) ]
}}}
produces the correct error message with [Char] instead of `w_a1bp'.
I was doing this with GHC-6.4.2 on Ubuntu with a 2.6.17 kernel.
Comment:
Happily, this is fine in GHC 6.6. I don't think it's serious enough to
fix in 6.4. Thanks for reporting it though. We always like to hear about
poor error messages.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1121>
GHC <http://www.haskell.org/ghc/>
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