Behavior change of Data.Char

[Joachim Breitner]

Hi

the section header “Character classification” could indicate that these
predicates are based on the Unicode standard, and possibly for each
predicate indicate the definition in terms of Unicode character classes.

Greetings,
Joachim

Am Freitag, den 20.02.2015, 08:20 -0500 schrieb David Feuer:
> I don't think so. There's no guarantee that future versions will
> maintain it, and I don't know that we want to take responsibility for
> continually checking on that.
> 
> David
> 
> On Feb 20, 2015 Simon Peyton Jones wrote:
> > It'd be good to document this condition/invariant in the Haddocks,
> wouldn't it?!
> >
> > Simon
> >
> > |  -----Original Message-----
> > |  From: ghc-devs [mailto:ghc-devs-bounces at haskell.org] On Behalf Of
> > |  Herbert Valerio Riedel
> > |  Sent: 19 February 2015 10:42
> > |  To: Kazu Yamamoto
> > |  Cc: libraries at haskell.org; ghc-devs at haskell.org
> > |  Subject: Re: Behavior change of Data.Char
> > |
> > |  On 2015-02-19 at 06:19:18 +0100, Kazu Yamamoto (????) wrote:
> > |  > It seems to me that some characters of GHC 7.10.1RC2 behave
> > |  > differently from those of GHC 7.8.4:
> > |  >
> > |  >                           7.8.4   7.10.1RC2
> > |  > isLower (char 170)        True    False
> > |
> > |  Fwiw, the motivation for that particular change may be (I'm just
> > |  guessing here) to have the following condition hold:
> > |
> > |    \c -> isLower c `implies` (not . isLower . toUpper) c
> > |
> > |  i.e. if something is 'lower-case', then applying 'toUpper' should
> > |  result in a character that is not 'lower-case' anymore. This
> didn't
> > |  hold with 7.8.4's Unicode 6, but now holds with 7.10.1's Unicode
> 7
> > |  definitions.
> > |
> > |  Cheers,
> > |    hvr
> > |  _______________________________________________
> > |  ghc-devs mailing list
> > |  ghc-devs at haskell.org
> > |  http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
> 
> 
> _______________________________________________
> ghc-devs mailing list
> ghc-devs at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs

-- 
Joachim “nomeata” Breitner
  mail at joachim-breitner.de • http://www.joachim-breitner.de/
  Jabber: nomeata at joachim-breitner.de  • GPG-Key: 0xF0FBF51F
  Debian Developer: nomeata at debian.org

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: This is a digitally signed message part
URL: <http://mail.haskell.org/pipermail/ghc-devs/attachments/20150220/0dc59260/attachment.sig>