[perl #114456] [BUG] Invocation '()' after sub declaration doesn't parse in Rakudo (but does in STD)

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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    <diakopter> rn: say sub { 5 }()
    <p6eval> niecza v19-15-g051783d: OUTPUT«5␤»
    <p6eval> ..rakudo 7ec7a2: OUTPUT«===SORRY!===␤Confused␤at
/tmp/CUV6nwoMFP:1␤»
    <masak> std: say sub { 5 }()
    <p6eval> std c3e944a: OUTPUT«ok 00:00 41m␤»
    * masak submits rakudobug
    < masak> diakopter++