you're probably right, this could be regarded as dead code for ghc 7.8 (esp since alex and happy must be the recent versions to even build ghc HEAD ! )
On Tue, Jan 7, 2014 at 2:25 AM, Mateusz Kowalczyk <[email protected]>wrote: > Greetings, > > When looking at the GHC lexer (Lexer.x), there's: > > > $unispace = \x05 -- Trick Alex into handling Unicode. See alexGetChar. > > $whitechar = [\ \n\r\f\v $unispace] > > $white_no_nl = $whitechar # \n > > $tab = \t > > Scrolling down to alexGetChar and alexGetChar', we see the comments: > > > > -- backwards compatibility for Alex 2.x > > alexGetChar :: AlexInput -> Maybe (Char,AlexInput) > > > > -- This version does not squash unicode characters, it is used when > > -- lexing strings. > > alexGetChar' :: AlexInput -> Maybe (Char,AlexInput) > > What's the reason for these? I was under the impression that since > 3.0, Alex has natively supported unicode. Is it just dead code? Could > all the hex $uni* functions be removed? If not, why not? > > -- > Mateusz K. > _______________________________________________ > ghc-devs mailing list > [email protected] > http://www.haskell.org/mailman/listinfo/ghc-devs >
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