local $[ = $r->[0]
I had the same thought; localize $[ and let it do the work, and probably ran into the same problem. That sent me diving back into perlvar.
We've had drilled into our heads not to use $[ with such a strong emphasis on DON'T that I at least had completely forgotten...
As of release 5 of Perl, assignment to $[ is treated as a compiler directive, and cannot influence the behavior of any other file. (That's why you can only assign compile-time constants to it.)
Dave
In reply to Re^2: Code challenge: array subrange
by davido
in thread Code challenge: array subrange
by spurperl
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