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<h1>#58392: Recursion and for loops interact badly in Rakudo</h1>
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pmichaud
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masak
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viklund
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<li><a class="showlink status-resolved" href="http://rt.perl.org/rt3/Ticket/Display.html?id=56512">
56512: (pmichaud) [META] [BUG] ongoing lexical issues with Rakudo, PCT, and Parrot [resolved]
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60046: (Nobody) [META] November 2008 release [resolved]
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recbug.pir<br />
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<a href="/rt3/Ticket/Attachment/465958/215860/recbug.pir">
Wed Sep 03 12:34:58 2008 (1.1k) by masak
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<a name="txn-463914" href="/rt3/Ticket/Display.html?id=58392#txn-463914">#</a>
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<td class="date">Wed Aug 27 02:54:17 2008</td>
<td class="description">
masak - Ticket created
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<td align="right" class="message-header-key">Subject:</td>
<td class="message-header-value">Recursion and for loops interact badly in Rakudo</td>
</tr>
<tr>
<td align="right" class="message-header-key">Date:</td>
<td class="message-header-value">Wed, 27 Aug 2008 11:53:53 +0200</td>
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<tr>
<td align="right" class="message-header-key">To:</td>
<td class="message-header-value">rakudobug <!-- x --> at perl.org</td>
</tr>
<tr>
<td align="right" class="message-header-key">From:</td>
<td class="message-header-value">"Carl Mäsak" <cmasak <!-- x --> at gmail.com></td>
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<div class="message-stanza-depth-0">
r30589:<br />
$ cat for-loop-recursion.bug<br />
sub f($l) {<br />
return() if $l <= 0;<br />
say "entering $l";<br />
for 1..3 {<br />
f($l-1);<br />
say "looping in $l";<br />
}<br />
}<br />
f(2);<br />
<br />
$ ./perl6 for-loop-recursion.bug<br />
entering 2<br />
entering 1<br />
looping in 1<br />
looping in 0<br />
looping in -1<br />
looping in 2<br />
looping in -2<br />
looping in -3<br />
<br />
Something to do with local pads, perhaps?<br />
<br />
FWIW, I can trace the bug back to r29884, the first revision that<br />
gives any output at all on the above script.<br />
<br />
Here's a Perl 5 comparison:<br />
<br />
$ cat for-loop-recursion.p5<br />
use strict;<br />
use warnings;<br />
<br />
sub f {<br />
my $l = shift;<br />
return if $l <= 0;<br />
print "entering $l\n";<br />
for (1..3) {<br />
f($l-1);<br />
print "looping in $l\n";<br />
}<br />
}<br />
f(2);<br />
<br />
$ perl for-loop-recursion.p5<br />
entering 2<br />
entering 1<br />
looping in 1<br />
looping in 1<br />
looping in 1<br />
looping in 2<br />
entering 1<br />
looping in 1<br />
looping in 1<br />
looping in 1<br />
looping in 2<br />
entering 1<br />
looping in 1<br />
looping in 1<br />
looping in 1<br />
looping in 2<br />
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<a name="txn-463968" href="/rt3/Ticket/Display.html?id=58392#txn-463968">#</a>
</td>
<td class="date">Wed Aug 27 07:26:20 2008</td>
<td class="description">
moritz <!-- x --> at verplant.org - Correspondence added
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<td align="right" class="message-header-key">Subject:</td>
<td class="message-header-value">Re: [perl #58392] Recursion and for loops interact badly in Rakudo</td>
</tr>
<tr>
<td align="right" class="message-header-key">Date:</td>
<td class="message-header-value">Wed, 27 Aug 2008 16:26:00 +0200</td>
</tr>
<tr>
<td align="right" class="message-header-key">To:</td>
<td class="message-header-value">perl6-compiler <!-- x --> at perl.org</td>
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<td align="right" class="message-header-key">From:</td>
<td class="message-header-value">Moritz Lenz <moritz <!-- x --> at verplant.org></td>
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Carl MXXsak (via RT) wrote:<br />
<div class="message-stanza-depth-1">
> r30589:<br />
> $ cat for-loop-recursion.bug<br />
> sub f($l) {<br />
> return() if $l <= 0;<br />
> say "entering $l";<br />
> for 1..3 {<br />
> f($l-1);<br />
> say "looping in $l";<br />
> }<br />
> }<br />
> f(2);<br />
</div>
<br />
I re-worked that as a test and added it to t/spec/S04-statements/for.t<br />
<br />
Moritz<br />
-- <br />
Moritz Lenz<br />
http://moritz.faui2k3.org/ | http://perl-6.de/<br />
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<a name="txn-463972" href="/rt3/Ticket/Display.html?id=58392#txn-463972">#</a>
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<td class="date">Wed Aug 27 07:26:23 2008</td>
<td class="description">
RT_System - Status changed from 'new' to 'open'
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<a name="txn-465954" href="/rt3/Ticket/Display.html?id=58392#txn-465954">#</a>
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<td class="date">Wed Sep 03 11:28:56 2008</td>
<td class="description">
chromatic <!-- x --> at wgz.org - Correspondence added
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<td class="message-header-value">Moritz Lenz <moritz <!-- x --> at verplant.org></td>
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<td align="right" class="message-header-key">Subject:</td>
<td class="message-header-value">Re: [perl #58392] Recursion and for loops interact badly in Rakudo</td>
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<td class="message-header-value">Wed, 3 Sep 2008 11:22:42 -0700</td>
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<td class="message-header-value">perl6-compiler <!-- x --> at perl.org</td>
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<td class="message-header-value">chromatic <chromatic <!-- x --> at wgz.org></td>
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On Wednesday 27 August 2008 07:26:00 Moritz Lenz wrote:<br />
<br />
<div class="message-stanza-depth-1">
> Carl MXXsak (via RT) wrote:<br />
</div>
<br />
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<div class="message-stanza-depth-2">
> > r30589:<br />
> > $ cat for-loop-recursion.bug<br />
> > sub f($l) {<br />
> > return() if $l <= 0;<br />
> > say "entering $l";<br />
> > for 1..3 {<br />
> > f($l-1);<br />
> > say "looping in $l";<br />
> > }<br />
> > }<br />
> > f(2);<br />
</div>
><br />
> I re-worked that as a test and added it to t/spec/S04-statements/for.t<br />
</div>
<br />
If you or Carl can provide a PIR program which exhibits he problem, I'll fix <br />
it.<br />
<br />
-- c<br />
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<a name="txn-465958" href="/rt3/Ticket/Display.html?id=58392#txn-465958">#</a>
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<td class="date">Wed Sep 03 12:34:58 2008</td>
<td class="description">
masak - Comments added
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Attaching stripped-down PIR code -- this may or may not be what you<br />
requested, chromatic. (There are still a few Rakudo dependencies left in<br />
the PIR code. But these are all simple things, so people more versed in<br />
PIR might be able to remove these.)<br />
<br />
We can run it through Rakudo as follows:<br />
<br />
$ ./perl6 -e 'use recbug'<br />
<br />
and it produces as output<br />
<br />
2<br />
1<br />
<br />
when it should really be producing<br />
<br />
2<br />
1<br />
1<br />
1<br />
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<a href="/rt3/Ticket/Attachment/465958/215860/recbug.pir">Download recbug.pir</a>
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<a name="txn-466184" href="/rt3/Ticket/Display.html?id=58392#txn-466184">#</a>
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<td class="date">Thu Sep 04 12:26:19 2008</td>
<td class="description">
pmichaud - Correspondence added
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<td class="message-header-value">perl6-compiler <!-- x --> at perl.org, Moritz Lenz <moritz <!-- x --> at verplant.org></td>
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<td class="message-header-value">Re: [perl #58392] Recursion and for loops interact badly in Rakudo</td>
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<td class="message-header-value">Thu, 4 Sep 2008 14:25:45 -0500</td>
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<td class="message-header-value">chromatic <chromatic <!-- x --> at wgz.org></td>
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<td align="right" class="message-header-key">From:</td>
<td class="message-header-value">"Patrick R. Michaud" <pmichaud <!-- x --> at pobox.com></td>
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On Wed, Sep 03, 2008 at 11:22:42AM -0700, chromatic wrote:<br />
<div class="message-stanza-depth-1">
> On Wednesday 27 August 2008 07:26:00 Moritz Lenz wrote:<br />
<div class="message-stanza-depth-2">
> > Carl MXXsak (via RT) wrote:<br />
</div>
> <br />
<div class="message-stanza-depth-2">
<div class="message-stanza-depth-3">
> > > r30589:<br />
> > > $ cat for-loop-recursion.bug<br />
> > > sub f($l) {<br />
> > > return() if $l <= 0;<br />
> > > say "entering $l";<br />
> > > for 1..3 {<br />
> > > f($l-1);<br />
> > > say "looping in $l";<br />
> > > }<br />
> > > }<br />
> > > f(2);<br />
</div>
> ><br />
> > I re-worked that as a test and added it to t/spec/S04-statements/for.t<br />
</div>
> <br />
> If you or Carl can provide a PIR program which exhibits he problem, I'll fix <br />
> it.<br />
</div>
<br />
As of r37064, it's now possible to do this using the --target=pir<br />
option to rakudo:<br />
<br />
$ cat for-loop-recursion.bug<br />
sub f($l) {<br />
return() if $l <= 0;<br />
say "entering $l";<br />
for 1..3 {<br />
f($l-1);<br />
say "looping in $l";<br />
}<br />
}<br />
f(2);<br />
<br />
<br />
$ ./parrot perl6.pbc --target=pir --output=for.pir for-loop-recursion.bug<br />
$ ./parrot for.pir<br />
entering 2<br />
entering 1<br />
looping in 1<br />
looping in 0<br />
looping in -1<br />
looping in 2<br />
looping in -2<br />
looping in -3<br />
$<br />
<br />
Currently the perl6.pbc has to be somewhere where load_bytecode can<br />
find it (current directory or runtime/parrot/library) -- I'm still<br />
thinking about RT #47992 before deciding when/how I want it to be<br />
installed somewhere.<br />
<br />
Pm<br />
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<a name="txn-466188" href="/rt3/Ticket/Display.html?id=58392#txn-466188">#</a>
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<td class="date">Thu Sep 04 12:32:09 2008</td>
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viklund - Cc viklund added
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<a name="txn-466190" href="/rt3/Ticket/Display.html?id=58392#txn-466190">#</a>
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<td class="date">Thu Sep 04 13:06:50 2008</td>
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pmichaud - Correspondence added
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<td class="message-header-value">perl6-compiler <!-- x --> at perl.org, Moritz Lenz <moritz <!-- x --> at verplant.org></td>
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<td class="message-header-value">Re: [perl #58392] Recursion and for loops interact badly in Rakudo</td>
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<td class="message-header-value">Thu, 4 Sep 2008 15:06:28 -0500</td>
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<td class="message-header-value">chromatic <chromatic <!-- x --> at wgz.org></td>
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<td class="message-header-value">"Patrick R. Michaud" <pmichaud <!-- x --> at pobox.com></td>
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On Thu, Sep 04, 2008 at 02:25:45PM -0500, Patrick R. Michaud wrote:<br />
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> As of r37064, it's now possible to do this using the --target=pir<br />