'abc' ~~ m/b/;
By current spec this would
1) temporary set $_ = 'abc'
2) call m/b/, which matches against $_
3) produce a Match object
4) calls .ACCEPTS($_) on the Match object
5) return False
'abc' ~~ .uc
ends up comparing 'abc' to 'ABC and return False.
I guess that's not what we want, so there might be a need for a rule
preventing the .ACCEPTS call when $_ is used on the RHS.
(The previous spec with syntactic forms kinda solved the problem, the $_
topicalization re-introduced it).
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