That must explain this too,

#!/usr/bin/perl

use strict;
use warnings;

sub returnsTrueButExpectedFalse {return 1 and 0}

die if 1 and 0;                        #does not die, but
die if returnsTrueButExpectedFalse();  #does die here, surprisingly
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B::Deparse shows the return statement as this,

(return(1) and 0);
[download]

which isn't quite enough to say the return(1) happens before the 0 is evaluated. That must be what's happening though, from your reminder about flow control and and.

Thanks for the tip about B::Deparse.

Jim

like AnoMonk explained, use the -p switch with B::Deparse to see more parens

D:\Users\lanx>perl -MO=Deparse,-p -e"sub { return 1 and 0 }"
sub {
    ((return 1) and 0);
}
;
-e syntax OK
[download]

Please note that -x7 or higher will also show the equivalence between if and and (albeit in the opposite direction)

D:\Users\lanx>perl -MO=Deparse,-p,-x7 -e"sub { 0 if return 1 }"
sub {
   ((return 1) and 0);
}
;
-e syntax OK
[download]

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!}