#5108: Allow unicode sub/superscript symbols in both identifiers and operators
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Reporter: mikhail.vorozhtsov | Owner:
Type: feature request | Status: patch
Priority: normal | Milestone: 7.4.1
Component: Compiler (Parser) | Version: 7.1
Keywords: lexer unicode | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Changes (by simonmar):
* difficulty: => Unknown
Comment:
I'm not keen on this patch for a few reasons:
* It's inconsistent to allow superscript/subscript on symbols. Haskell
doesn't currently allow primes on symbols, for example.
* The patch has a bunch of Unicode constants baked into it
* It adds a bunch of extra tests to the inner loop. I haven't
measured it but I wouldn't be surprised if this slows down the lexer.
Perhaps it might be better just to allow the category Lm (MODIFIER LETTER)
as part of an identifier? That would include all the primes and
subscript/superscript things.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5108#comment:4>
GHC <http://www.haskell.org/ghc/>
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