From @LLFourn

# Foo.pm
use Test;
BEGIN { my $whatever=$*REPO }
===SORRY!===
Missing serialize REPR function for REPR MVMContext

Pretty odd one. If you don't 'use Test' (or any other module it will be
fine).

From @LLFourn

Or even​:
# Foo.pm
BEGIN
$*REPO.need(CompUnit​::DependencySpecification.new(​:short-name('Test')));

perl6 -Ilib -e 'use Foo';
===SORRY!===
Missing serialize REPR function for REPR MVMContext

On Mon, Jan 18, 2016 at 1​:44 PM perl6 via RT <perl6-bugs-followup@​perl.org>
wrote​:

Greetings,

This message has been automatically generated in response to the
creation of a trouble ticket regarding​:
"[precomp] Missing serialize REPR function for REPR MVMContext",
a summary of which appears below.

There is no need to reply to this message right now. Your ticket has been
assigned an ID of [perl #​127302].

Please include the string​:

     \[perl #​127302\]

in the subject line of all future correspondence about this issue. To do
so,
you may reply to this message.

                    Thank you,
                    perl6\-bugs\-followup@​perl\.org

-------------------------------------------------------------------------
# Foo.pm
use Test;
BEGIN { my $whatever=$*REPO }
===SORRY!===
Missing serialize REPR function for REPR MVMContext

Pretty odd one. If you don't 'use Test' (or any other module it will be
fine).

From @LLFourn

Perhaps relevant irc​:

http://irclog.perlgeek.de/moarvm/2015-12-04

On Mon, Jan 18, 2016 at 1​:56 PM Lloyd Fournier <lloyd.fourn@​gmail.com>
wrote​:

Or even​:
# Foo.pm
BEGIN
$*REPO.need(CompUnit​::DependencySpecification.new(​:short-name('Test')));

perl6 -Ilib -e 'use Foo';
===SORRY!===
Missing serialize REPR function for REPR MVMContext

On Mon, Jan 18, 2016 at 1​:44 PM perl6 via RT <perl6-bugs-followup@​perl.org>
wrote​:

Greetings,

This message has been automatically generated in response to the
creation of a trouble ticket regarding​:
"[precomp] Missing serialize REPR function for REPR MVMContext",
a summary of which appears below.

There is no need to reply to this message right now. Your ticket has been
assigned an ID of [perl #​127302].

Please include the string​:

     \[perl #​127302\]

in the subject line of all future correspondence about this issue. To do
so,
you may reply to this message.

                    Thank you,
                    perl6\-bugs\-followup@​perl\.org

-------------------------------------------------------------------------
# Foo.pm
use Test;
BEGIN { my $whatever=$*REPO }
===SORRY!===
Missing serialize REPR function for REPR MVMContext

Pretty odd one. If you don't 'use Test' (or any other module it will be
fine).

From @zoffixznet

Still present in Rakudo version 2016.07.1-88-g15ee3c3 built on MoarVM version 2016.07-11-g11e02fe