[perl #117641] 'is copy' doesn't work when parameter is bound to a literal

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# New Ticket Created by  Moritz Lenz 
# Please include the string:  [perl #117641]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=117641 >


09:56 < [0xF]> question #2: sub foo(Int $x is copy) { $x = 5; } f(1);
               # Cannot assign to a non-container
09:56 < tadzik> r: sub foo(Int $x is copy) { $x = 5; }; foo(1);
09:56 <+camelia> rakudo 4109be: OUTPUT«Cannot modify an immutable value␤ 
  in  block  at /tmp/eHvKDUJqEz:1␤␤»

This is a bug. 'is copy' should make sure there's always a container.

Cheers,
Moritz