IMO, the warning in question is unnecessary and should
be removed if and only if it always occurs together with
another warning such as useless use of foo in void
context.
Does anyone know whether it's possible to trigger the
'interpreted as function' warning alone?
$;=sub{$/};@;=map{my($a,$b)=($_,$;);$;=sub{$a.$b->()}}
split//,".rekcah lreP rehtona tsuJ";$\=$ ;->();print$/
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