> HsParser fails on any of these 6 examples:
>
[...]
>
> The problem seems to be the production (copied from HsParser.ly)
>
> > layout_off :: { () } : {% pushContext NoLayout }
>
> This production is supposed to make the parser enter a NoLayout
> context every time the lexer reaches an open brace '{'. It is used in
> other productions such as
>
> > decllist :: { [HsDecl] }
> > : '{' layout_off decls '}' { $3 }
> > | layout_on decls close { $2 }
>
> For some reason the use of layout_off only takes effect _after_ the
> lexer has produced the next token.
Yes, Happy seems to be grabbing a lookahead token, even though it
doesn't need to. Anyway, your fix is the right one because it avoids
this non-deterministic behaviour in Happy, and it brings HsParser into
line with the way that GHC's parser works.
I've committed your patches, thanks!
Cheers,
Simon
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