From @zoffixznet

If `no precompilation` is added to A.pm6 , the error goes away.

zoffix@​VirtualBox​:/tmp/tmp.YwbSHxhVWC$ cat A.pm6
use experimental :cached;
sub foo($x) is export is cached { $x }
zoffix@​VirtualBox​:/tmp/tmp.YwbSHxhVWC$ perl6 -I. -MA -e 'foo 42'
Cannot invoke this object (REPR​: Null; VMNull)
  in block at /home/zoffix/.rakudobrew/moar-nom/install/share/perl6/sources/AAC61C0EC6F88780427830443A057030CAA33846 (experimental) line 10
  in any enter at gen/moar/m-Metamodel.nqp line 3963
  in block <unit> at -e line 1

The issue appeared in one of these commits​: rakudo/rakudo@2c69ab7...bc722ab

Looking at the implementation of is cached, these two bugs may or may not be related​:
https://rt-archive.perl.org/perl6/Ticket/Display.html?id=128476
https://rt-archive.perl.org/perl6/Ticket/Display.html?id=107844

--
Cheers,
ZZ | https://twitter.com/zoffix

From @zoffixznet

Well, I lied, 2c69ab7 already contains the bug. My estimate was due to the docs build failing due to this bug and it started failing around the time of 2c69ab7

From @LLFourn

Hi Zoffix,

You reported the same bug in December :P

https://rt.perl.org/Public/Bug/Display.html?id=126818 (although the error
message has changed).

This is the compile time outer context serialization bug. FYI I've kept a
list of tickets that are examples of it​:

https://rt.perl.org/Public/Bug/Display.html?id=125634
https://rt.perl.org/Public/Bug/Display.html?id=126818
https://rt.perl.org/Public/Bug/Display.html?id=127034
https://rt.perl.org/Public/Bug/Display.html?id=127112
https://rt.perl.org/Public/Bug/Display.html?id=127858
https://rt.perl.org/Public/Bug/Display.html?id=127860
https://rt.perl.org/Public/Bug/Display.html?id=127959
https://rt.perl.org/Public/Bug/Display.html?id=128636

On Sun, Jul 17, 2016 at 5​:59 AM Zoffix Znet <perl6-bugs-followup@​perl.org>
wrote​:

# New Ticket Created by Zoffix Znet
# Please include the string​: [perl #​128636]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=128636 >

If `no precompilation` is added to A.pm6 , the error goes away.

zoffix@​VirtualBox​:/tmp/tmp.YwbSHxhVWC$ cat A.pm6
use experimental :cached;
sub foo($x) is export is cached { $x }
zoffix@​VirtualBox​:/tmp/tmp.YwbSHxhVWC$ perl6 -I. -MA -e 'foo 42'
Cannot invoke this object (REPR​: Null; VMNull)
in block at
/home/zoffix/.rakudobrew/moar-nom/install/share/perl6/sources/AAC61C0EC6F88780427830443A057030CAA33846
(experimental) line 10
in any enter at gen/moar/m-Metamodel.nqp line 3963
in block <unit> at -e line 1

The issue appeared in one of these commits​:
rakudo/rakudo@2c69ab7...bc722ab

Looking at the implementation of is cached, these two bugs may or may not
be related​:
https://rt-archive.perl.org/perl6/Ticket/Display.html?id=128476
https://rt-archive.perl.org/perl6/Ticket/Display.html?id=107844

--
Cheers,
ZZ | https://twitter.com/zoffix

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