Underscores in qualified names in HsParser
Anders Lau Olsen
alauo at mip.sdu.dk
Sat Jul 13 20:32:45 EDT 2002
HsParser is confused by the combination of qualified names and
identifiers starting with underscores. For example:
module M where
_f _ _ = 0
x = 0 `M._f` 0 -- parse error at '.'
y = M._f 0 0 -- parses as M . (_f 0 0)
I have tested this only for GHC 5.02. For what it's worth, I am pretty
sure the later versions behave the same, and that the fix is to
replace line 336 in Lexer.hs
| isLower c -> do -- qualified varid?
| isLower c || c == '_' -> do -- qualified varid?
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