search_isa() is simply @ISA, because can searches the whole inheritance tree of the supplied class.
use strict;
use warnings;
package AA;
sub dostuff { print(scalar(caller()), $/); }
package BB;
package CC;
BEGIN { our @ISA = 'AA'; }
package DD;
use vars qw(@ISA);
BEGIN { @ISA = qw(BB CC); }
sub dostuff {
foreach my $super (@ISA) {
#if (my $method = $super->can('dostuff')) {
# -or-
if (my $method = UNIVERSAL::can($super, 'dostuff')) {
#print($super, $/);
#print($method, $/);
goto $method;
}
}
}
package main;
#print(\&AA::dostuff, $/);
bless({},'DD')->dostuff(); # Prints "main"
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