[Haskell-cafe] Has character changed in GHC 6.8?

[Magnus Therning]

On 1/22/08, Duncan Coutts <duncan.coutts at worc.ox.ac.uk> wrote:
>
>
> On Tue, 2008-01-22 at 09:29 +0000, Magnus Therning wrote:
> > I vaguely remember that in GHC 6.6 code like this
> >
> >   length $ map ord "a string"
> >
> > being able able to generate a different answer than
> >
> >   length "a string"
>
> That seems unlikely.


Unlikely yes, yet I get the following in GHCi (ghc 6.6.1, the version
currently in Debian Sid):

> map ord "a"
[97]
> map ord "ö"
[195,182]

Funky, isn't it? ;-)

Easy!
>
> Prelude> 'å' == '\229'
> True
> Prelude> 'å' == Char.chr 229
> True
>
> Remember, when you type:
> Prelude> 'å'
>
> what you really get is:
> Prelude> putStrLn (show 'å')
>
> So perhaps what is confusing you is the Show instance for Char which
> converts Char -> String into a portable ascii representation.


Have you tried putting any of this into GHCi (6.6.1)?  Any line with 'å'
results in the following for me:

> 'å'
<interactive>:1:2: lexical error in string/character literal at character
'\165'
> "å"
"\195\165"

Somewhat disappointing.  GHCi 6.8.2 does perform better though.

/M
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