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Re^6: Perl bug ?

by tinita (Parson)
on Feb 06, 2013 at 13:20 UTC ( [id://1017422]=note: print w/replies, xml ) Need Help??


in reply to Re^5: Perl bug ?
in thread Perl bug ?

seems like the arguments for "for" are executed first and then the loop body. so:
the first element is $e && 0 which evaluates to $e. then the second argument is processed, autovivify happens.
when in the loop body, $e is an array reference already, and because the first element is an alias to $e it prints ARRAY(0xde0d48). seems logical to me.

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Re^7: Perl bug ?
by Corion (Patriarch) on Feb 06, 2013 at 13:23 UTC

    Yes. B::Deparse shows the same interpretation:

    Q:\>perl -MO=Deparse -E "my $e; say for $e && 0, $e->[0];"
BEGIN {
    $^H{'feature_unicode'} = q(1);
    $^H{'feature_say'} = q(1);
    $^H{'feature_state'} = q(1);
    $^H{'feature_switch'} = q(1);
}
my $e;
;
say $_ foreach ($e && 0, $$e[0]);
-e syntax OK

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