From @cpansprout

$ perl -e 'eval "print q\x{U+10028}Hello, whirled!\n\x{U+10029}" or die;'
Hello, whirled!

Wow.

U+28 is ‘(’ and U+29 is ‘)’. We have a 32-bit wrapping problem.

Same results in 5.8.7 and 5.25.3.

--

Father Chrysostomos

From @cpansprout

On Tue Jul 26 00​:12​:42 2016, sprout wrote​:

$ perl -e 'eval "print q\x{U+10028}Hello, whirled!\n\x{U+10029}" or die;'
Hello, whirled!

Wow.

U+28 is ‘(’ and U+29 is ‘)’. We have a 32-bit wrapping problem.

Scratch that. I misread the code, and then I put typoes in my test. This report is bogus. (Though I still think there is an I32 bug, but I’ll open another ticket if I find it.)

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Father Chrysostomos

The RT System itself - Status changed from 'new' to 'open'

@cpansprout - Status changed from 'open' to 'rejected'

From zefram@fysh.org

Father Chrysostomos wrote​:

U+28 is "(" and U+29 is ")". We have a 32-bit wrapping problem.

That would be a 16-bit wrapping problem, but it's not. "\x{U+10028}" eq
"\0". The problem we have is \x{} accepting arbitrary non-numeric crap
that it won't interpret. (It does give a warning, if one turns them on.)
Since it's ignoring the "U" and everything following, it seems to me that
this is not a meaningful construct and should not be accepted at all.
"\x{}" with nothing in the braces is accepted (without even a warning)
and gives a very different silly result; that should be illegal too.

-zefram

From @cpansprout

On Tue Jul 26 01​:22​:33 2016, zefram@​fysh.org wrote​:

Father Chrysostomos wrote​:

U+28 is "(" and U+29 is ")". We have a 32-bit wrapping problem.

That would be a 16-bit wrapping problem, but it's not. "\x{U+10028}" eq
"\0".

I know. I wasn’t thinking. (Just now I typed ‘use Devel​::Peek’ in toke.c! I must be tired.)

  The problem we have is \x{} accepting arbitrary non-numeric crap

that it won't interpret. (It does give a warning, if one turns them on.)
Since it's ignoring the "U" and everything following, it seems to me that
this is not a meaningful construct and should not be accepted at all.
"\x{}" with nothing in the braces is accepted (without even a warning)
and gives a very different silly result; that should be illegal too.

I’m not interested in disturbing that hornet’s nest right now.

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Father Chrysostomos