#5239: Em-dash for "--" with UnicodeSyntax.
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Reporter: Eelis- | Owner:
Type: feature request | Status: patch
Priority: normal | Milestone: 7.4.1
Component: Compiler (Parser) | Version: 7.0.3
Keywords: unicode syntax extension | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Changes (by porges):
* status: new => patch
Comment:
I have added a tentative patch. It works fine, but if UnicodeSyntax is
disabled then the lexer gives an error upon encountering the mdashes...
unexpected character '\n' or something. I thought that this was because of
the 'Unicode fix' which transforms mdash into \x7, but Alex always
complains about \n, not whatever it gets transformed into.
I'm not sure how to fix that, so I'm attaching it here in the hopes that
someone else knows.
I also added some extra checking to the 'not in scope' error (in
RnEnv.lhs) that suggests that users might want to enable UnicodeSyntax if
compilation fails because an mdash isn't in scope. A further extension
would be for this to happen when any UnicodeSyntax character turns up
here. (This can't be seen at the moment because of the aforementioned
issue but works fine if only this part is enabled.)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5239#comment:2>
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