[perl #82142] [BUG] s/// substitutions allow the null pattern in Rakudo (but not in STD)

[Carl Mäsak]

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<masak> rakudo: $_ = 'foo'; s:g/ /a/; say 'alive'
<p6eval> rakudo 8681da: OUTPUT«alive␤»
<masak> std: $_ = 'foo'; s:g/ /a/
<p6eval> std 625303c: OUTPUT«===SORRY!===␤Null
pattern not allowed  [...] FAILED 00:01 122m␤»
* masak submits rakudobug