[perl #131331] [BUG] Wrong useless use warning in grep + try + after

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# New Ticket Created by  Zoffix Znet 
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<Zoffix__> m: ^2 .grep: {try 1 after 0}
<camelia> rakudo-moar a7c23a: OUTPUT: «WARNINGS for <tmp>:␤Useless use of 
"after" in expression "1 after 0" in sink context (line 1)␤»