[perl #67222] [BUG] the value of $/ in closures in the second argument of .=subst calls is all wrong in Rakudo

[Carl Mäsak]

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<masak> rakudo: $_ = "(foo,bar,(baz))"; .=subst( /<-[(),]>+/, { "'$/'"
}, :g ); .say
<p6eval> rakudo 6a4d66: OUTPUT«Use of uninitialized value␤Use of
uninitialized value␤Use of uninitialized value␤('','',(''))␤»
<masak> that can't be right.
<pmichaud> I suspect the   .=subst
* masak submits rakudobug
<zulon> even with another var ($x eg) this still gives the same result
<pmichaud> looks like a .= bug
<zulon> hm you're right, with $x = $x.subst this works fine
<masak> zulon: there's your workaround, then. :)