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sub to_undo (&) {
    my ($code) = @_;
    push our(@undo_stack), $code;
    return;
}
 
 
sub reversibly(&) {
    my ($code) = @_;
 
    local $SIG{INT} = sub { die "SIGINT\n" };
    local $SIG{TERM} = sub { die "SIGTERM\n" };
    local our(@undo_stack);  # to allow nested, reversible computations
 
    my $rc = eval { $code->() };
    if ( my $exception = $@ ) {
        our $failure_warning;
        warn $failure_warning if defined $failure_warning;