[perl #57858] $/ is de-defined in if blocks in rakudo

[Carl Mäsak]

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r30183:
$ ./perl6 -e '"yo" ~~ /yo/; say $/' # works
yo

$ ./perl6 -e 'if "yo" ~~ /yo/ { say $/ }' # worksn't
Null PMC access in get_string()
[...]

$ ./perl6 -e '"foo" ~~ /foo/; if 42 { say $/ }'
Null PMC access in get_string()
[...]