Re: The extent of double-quotish interpolation

[p5pRT]

Migrated from rt.perl.org#1500 (status was 'resolved')

Searchable as RT1500$

[p5pRT]

From The RT System itself

That's not true since 5.005_57. See Hugo's patch that went in at
change#3406.

and I think this should be fixed. However, I agree that it would be a
terrible blunder to fix this and break

@​a = ()[0,1];

Here, @​a should have zero elements, not two. This would be sensible and
leave your (getpwent)[7,0] example intact.

Ah, I think I see what you mean now. You want these to behave differently​:

DB<1> print $count = @​array = ((undef) x 3)[0,1,2]
0
DB<2> print $count = @​array = ()[0,1,2]
0

You'd have the first version start returning three, but leave the second
version alone. The potential for breakage here is certainly reduced
compared to what I misunderstood the original request to be, since there
are fewer cases that would change. And it's quite possible that it's
the latter case that people rely upon more than it is the former one.
Whether it's exclusively the latter case that matters, I wonder. But you
can't know what color the yolk is until you break the egg.

Omlette makers can sometimes tell without breaking anything. :-)

Sarathy
gsar@​activestate.com

[p5pRT]

From The RT System itself

That's not true since 5.005_57. See Hugo's patch that went in at
change#3406.

That means that perldata.pod needs an update.

--tom

[p5pRT]

From @schwern

[RT_System - Mon Sep 20 02​:46​:44 1999]​:

Ah, I think I see what you mean now. You want these to behave
differently​:

DB<1> print $count = @​array = ((undef) x 3)[0,1,2]
0
DB<2> print $count = @​array = ()[0,1,2]
0

You'd have the first version start returning three, but leave the second
version alone. The potential for breakage here is certainly reduced
compared to what I misunderstood the original request to be, since there
are fewer cases that would change. And it's quite possible that it's
the latter case that people rely upon more than it is the former one.
Whether it's exclusively the latter case that matters, I wonder. But you
can't know what color the yolk is until you break the egg.

Omlette makers can sometimes tell without breaking anything. :-)

And they do behave differently.

0 ~/tmp$ perl -le 'print $count = @​array = ((undef) x 3)[0,1,2]'
3
0 ~/tmp$ perl -le 'print $count = @​array = ()[0,1,2]'
0

So I guess whatever this was about its been resolved.

[p5pRT]

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

[p5pRT]

@schwern - Status changed from 'open' to 'resolved'