> The hmake parser specifically doesn't depend on layout. A
> module doing
> crazy stuff like
>
> module M where
> import qualified {- " -}
> N
>
> is perfectly fine, and all it takes to implement is the addition of a
> `concatMap' over and above the version which expects the whole import
> on one line. (FWIW, the hmake parser is ~200 lines, of which ~150
> lines deals with cpp, ~30 lines deals with comments, and ~20 lines
> actually reads the imports.)
But the point is you *can* construct valid modules which will confuse
hmake (I just did). Our experience with GHC has told us, if nothing
else, that the obscure cases always crop up eventually :-)
> > But ghci already contains a Haskell parser - so it should
> be much less
> > work.
>
> Agreed, except that you don't want to fully-parse each module
> twice, nor in general do you want to report all parse errors on the
> import-gathering pass!
Yes, that is indeed a problem.
Cheers,
Simon
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