[perl #125190] Rakudo-j does not handle <:alpha> in regexes

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12:45   pippo   r: say "a" ~~ /<:alpha>/;
12:45   camelia         rakudo-moar 2ea008: OUTPUT«｢a｣␤»
12:45           ..rakudo-jvm 2ea008: 
OUTPUT«java.util.regex.PatternSyntaxException: Unknown character 
property name {alpha} near index 8␤\p{alpha}␤        ^␤  in block 
<unit> at /tmp/tmpfile:1␤␤»
12:46   pippo   ^^ rakudo-j bug?
12:46   FROGGS  pippo: yes