> GHC's lexer (function Lex.mk_var_token) treats names starting with
> an underscore followed by an uppercase letter as a constructor (conid)
> and not as a variable (varid):
>
> module Foo where
> data T = _ThisWorksAlthoughItShouldNot
> _ThisShouldWorkButItDoesNot = '?'
>
> A comment in the source code tells something about syntax in interface
> files, but I don't have clue... Could somebody (SimonM?) explain why
> this is done that way?
It used to be needed to deal with compiler-generated constructors, eg. we
used to name dictionary constructors things like _DOrdInt so as not to clash
with the user namespace. It isn't necessary any more, now that the
namespaces are separated in a more robust fashion.
I've removed the hack in Lex.lhs. Thanks for the report...
Simon
