count = 0;
mt.iterate( 10, 4 ){ [X,Y]
	io.writeln( "outside of critical section", Y );
	mt.critical{[] # avoid redeclaring Y implicitly
		io.writeln( "in critical section", Y );
		for( i = 1 : 100000 ) count += 1;
	}
}
io.writeln( count );