parser: fix close_scope() missing when field.name is sort, sorted(fix#20436)

[shove70]

1. Fixed If use sort_with_compare, it will report an error #20436
2. Add tests.

struct Foo {
	sort []int
}

fn main() {
	f := Foo{}

	fn [f] () {
		println(f.sort.len)
		assert f.sort.len == 0
	}()
}

outputs:

0

[spytheman]

Good work.