#!perl -w
use strict;
use Guard;

sub alias {\@_};
sub localize {
    my @values = @{ +pop }; # or any other convenient method
    my $aliases=alias(@_);
    my @saved= @_;

    #warn Dumper \@saved;
    $_[$_] = $values[$_] for 0..$#values;
    guard {
        $aliases->[$_]=$saved[$_] for 0..$#saved;
    };
};

my ($a,$b)=('a','b');

print "Start\n";
print qq($a $b),"\n";

my $restore=localize($a,$b,['foo','bar']);

print "Localized\n";
print qq($a $b),"\n";
undef $restore;
print "Restored\n";
print qq($a $b), "\n";
__END__
Start
a b
Localized
foo bar
Restored
a b