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Postings from March 2014
Eric Brine wrote:
>"{" is determined to be a hash constructor by looking ahead and seeing "}".
>It would have to look even ahead further to determine a syntax error
>follows that. I don't know how feasible that is.
Looking ahead more than one token is not feasible. If I wanted to
make {} DWIM in this manner, I'd parse "{}" as a special production,
and resolve it as block or hash constructor grammatically. Of course,
that would introduce new ambiguities into the grammar, requiring some
fiddling to keep the really-ambiguous cases (such as sub { {} }) resolved
the way they are now.
Overall I don't think it's worth the trouble. Just use "{;" or "+{"
when there's doubt.
-zefram
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