[perl #123506] [JVM] List Comprehension assigned to capture variable is Nil

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# New Ticket Created by  Moritz Lenz 
# Please include the string:  [perl #123506]
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With rakudo-jvm 2014.12:

$ perl6-j -e 'my \T = ($_ for ^1); say T'
Nil
$

Compare this with

$ perl6-j -e 'say ($_ for ^2)'
0 1

and

$ perl6-m -e 'my \T = ($_ for ^2); say T'
0 1

This breaks Digest::MD5.