final int sum = 0
print <selection>sum</selection>
[1, 2, 3].each(new Closure(this, this) {
    @Override
    Object call(it) {
        it += sum
    }
})

print sum
-----
print 0
[1, 2, 3].each(new Closure(this, this) {
    @Override
    Object call(it) {
        it += 0
    }
})

print 0