[perl #124007] [BUG] method delegation doesn't work in roles

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As seen at http://irclog.perlgeek.de/perl6/2015-03-06#i_10237611 :

r: role R { method foo () handles <bar> { } }
rakudo-moar 1b74e4: OUTPUT«===SORRY!=== Error while compiling 
/tmp/tmpfile␤Method 'add_method' not found for invocant of class 
'Perl6::Metamodel::GenericHOW'␤at /tmp/tmpfile:1␤------> ␤»