#!perl
use strict;
use warnings;

my $x = 1;
sub lambda
{
    my $fn = pop;
    my @argrefs = \(@_);
    sub {
      my @scopes= map { tempSet( $argrefs[$_], $_[$_] ) } 0..$#_;
      &$fn;
    }
}

my $y = 'Yval';
my $closure = lambda $x, $y => sub { "$x and $y" };

print $closure->($_, rand(3)), "(X=$x, Y=$y)\n" for (qw(a bitty china 
+doll));

print "$x and $y\n"; # => 1

sub TempSet::DESTROY { shift(@_)->() }
sub tempSet {
    my( $sv, $new )= @_;
    my $prior= $$sv;
    my $restore= bless
        sub { $$sv= $prior },
        'TempSet';
    $$sv= $new;
    return $restore;
}
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