[ruby-core:29347] [Bug #1240] parser bug in 1.8.7 and 1.9.1p0

Issue #1240 has been updated by caleb clausen.


On 4/8/10, Yusuke ENDOH <[e-mail]> wrote:
> 2010/4/8 Caleb Clausen <[e-mail]>:
>> Wait.... please don't harden any bugs into the specification of the
>> language. If you want to say that it's too obscure/too hard to fix,
>> that's fine. WONTFIX is ok, under the circumstances. If you want to
>> say it's implementation dependent behavior, that's at least
>> acceptable. But let's not pretend that what's clearly a bug is
>> intended behavior. (Best of all would be to fix the bug, but I'm not
>> really asking for that.)
>
> You are right.  I guess it be considered as WONTFIX.

Thank you.

> BTW, how about the following? :-)
>
> # ok
> while (((((((((((((((((((((((((((((((false)))))))))))))))))))))))))))))))
> do; end
>
> # parse error
> while ((((((((((((((((((((((((((((((((false))))))))))))))))))))))))))))))))
> do; end

Ooooo! Both of those don't parse right in redparse. But not for the reason you seem to expect; it's objecting to the do on its own line. That is to say, this also doesn't parse:

  while false
  do; end

Thanks for the bug. I'll fix it right away.

Taking out the newline before do makes them parse right again. (For MRI too, tho.)

Incidentally, all the ruby versions I have (1.8.6, 1.9.0, 1.9.1) also object to do after a newline. I guess this was added (relatively) recently?

> If your CPU is 64 bit, please run after 32 '(' and ')' are added :-p

This was on a 32 bit cpu. I wouldn't anticipate any problems with any number of nested parentheses. (Until, that is, you run out of memory.)

> IMHO, do_cond (omittable `do' keyword in the part of while/until/for
> constructs) brings confusion but little benefit to the Ruby syntax.
> How about removal of do_cond in 2.0?

Hear, hear! I agree wholeheartedly. (Unless there's someone out there who actually likes this? Speak now or forever hold your peace.)
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http://redmine.ruby-lang.org/issues/show/1240

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