Proposals and owners

Neil Mitchell ndmitchell at
Sun Aug 2 16:21:49 EDT 2009

>>>>  >  remove FixityResolution from the context-free grammar
>>> Please take a look and comment.  This fixes a nasty bug in the Haskell
>>> syntax - albeit one that doesn't cause problems in practice, but still.
>>>  I
>>> think the changes make the grammar look nicer, and help compiler
>>> implementers by providing a sample implementation of fixity resolution.
>>> We better be sure the sample implementation is correct!  I've tested it
>>> fairly well, but I wouldn't rule out corner cases being wrong, especially
>>> with prefix negation.
>> The code in Resolve.hs has been used by HLint for months, and is the
>> basis of the resolution used in haskell-src-exts 1.0.0. In that time I
>> haven't seen any bugs with the fixity resolution.
> I updated the code on the wiki page: the previous version didn't handle
> prefix negation - did you implement that yourself in HLint?

No, I didn't implement prefix negation in HLint - it never came up as
an issue. Perhaps the underlying HSE library dealt with it for me -
Niklas would know.



More information about the Haskell-prime mailing list