What am I doing wrong?

Foo1.p6

use lib ‘.’;
use Foo2;

Foo2.pm6

use IRC::Client;

class Foo2 does IRC::Client::Plugin { }

result

$ perl6 Foo1.p6 
===SORRY!===
Missing serialize REPR function for REPR VMException

zexception

$ perl6 --ll-exception Foo1.p6 
Missing serialize REPR function for REPR VMException
   at gen/moar/stage2/QAST.nqp:5273  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/QAST.moarvm:serialize_sc)
 from gen/moar/stage2/QAST.nqp:5278  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/QAST.moarvm:deserialization_code)
 from gen/moar/stage2/QAST.nqp:5221  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/QAST.moarvm:compile_node)
 from gen/moar/stage2/QAST.nqp:5066  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/QAST.moarvm:as_mast)
 from gen/moar/stage2/QAST.nqp:4803  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/QAST.moarvm:to_mast)
 from gen/moar/stage2/QAST.nqp:6575  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/QAST.moarvm:to_mast)
 from gen/moar/stage2/NQPHLL.nqp:390  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:mast)
 from gen/moar/stage2/NQPHLL.nqp:1754  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:compile)
 from gen/moar/stage2/NQPHLL.nqp:1487  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:eval)
 from gen/moar/stage2/NQPHLL.nqp:1708  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:evalfiles)
 from gen/moar/stage2/NQPHLL.nqp:1602  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:command_eval)
 from src/Perl6/Compiler.nqp:27  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/Compiler.moarvm:command_eval)
 from gen/moar/stage2/NQPHLL.nqp:1576  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:command_line)
 from gen/moar/m-main.nqp:37  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/perl6.moarvm:MAIN)
 from gen/moar/m-main.nqp:33  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/perl6.moarvm:<mainline>)
 from <unknown>:1  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/perl6.moarvm:<main>)
 from <unknown>:1  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/perl6.moarvm:<entry>)

   at gen/moar/m-CORE.setting:23235  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm:throw)
 from gen/moar/m-CORE.setting:766  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm:die)
 from gen/moar/m-CORE.setting:755  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm:die)
 from gen/moar/m-CORE.setting:38694  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm:precompile)
 from gen/moar/m-CORE.setting:38490  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm:try-load)
 from gen/moar/m-CORE.setting:39340  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm:)
 from gen/moar/m-CORE.setting:39333  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/CORE.setting.moarvm:need)
 from src/Perl6/World.nqp:1193  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/World.moarvm:load_module)
 from src/Perl6/World.nqp:1123  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/World.moarvm:do_pragma_or_load_module)
 from src/Perl6/Grammar.nqp:1549  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/Grammar.moarvm:statement_control:sym<use>)
 from gen/moar/stage2/QRegex.nqp:1379  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/QRegex.moarvm:!protoregex)
 from <unknown>:1  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/Grammar.moarvm:statement_control)
 from src/Perl6/Grammar.nqp:1244  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/Grammar.moarvm:statement)
 from src/Perl6/Grammar.nqp:1173  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/Grammar.moarvm:statementlist)
 from gen/moar/stage2/NQPHLL.nqp:1092  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:LANG)
 from src/Perl6/Grammar.nqp:1563  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/Grammar.moarvm:FOREIGN_LANG)
 from src/Perl6/Grammar.nqp:1157  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/Grammar.moarvm:comp_unit)
 from src/Perl6/Grammar.nqp:460  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/Grammar.moarvm:TOP)
 from gen/moar/stage2/QRegex.nqp:2093  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/QRegex.moarvm:parse)
 from gen/moar/stage2/NQPHLL.nqp:1795  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:parse)
 from gen/moar/stage2/NQPHLL.nqp:1751  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:compile)
 from gen/moar/stage2/NQPHLL.nqp:1487  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:eval)
 from gen/moar/stage2/NQPHLL.nqp:1708  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:evalfiles)
 from gen/moar/stage2/NQPHLL.nqp:1602  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:command_eval)
 from src/Perl6/Compiler.nqp:27  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/Perl6/Compiler.moarvm:command_eval)
 from gen/moar/stage2/NQPHLL.nqp:1576  (/home/alex/.rakudobrew/moar-nom/install/share/nqp/lib/NQPHLL.moarvm:command_line)
 from gen/moar/m-main.nqp:37  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/perl6.moarvm:MAIN)
 from gen/moar/m-main.nqp:33  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/perl6.moarvm:<mainline>)
 from <unknown>:1  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/perl6.moarvm:<main>)
 from <unknown>:1  (/home/alex/.rakudobrew/moar-nom/install/share/perl6/runtime/perl6.moarvm:<entry>)