it keyword does not work for an aliased array,

[blackshirt]

Describe the bug

Code: https://vosca.dev/p/e14c8149cd

enum MsgType {
	null  = 0
	text  = 1
	ctrl  = 2
	frame = 3
}

struct Msg {
	msg_type MsgType
	payload  []u8
}

type Msgs = []Msg

fn main() {
	msgs0 := [Msg{
		msg_type: .null
	}, Msg{
		msg_type: .text
	}, Msg{
		msg_type: .null
	}, Msg{
		msg_type: .frame
	}]

	// it works without aliased msg
	msgs1 := msgs0.clone()
	null_msgs1 := msgs1.filter(it.msg_type == .null)
	dump(null_msgs1)

	// with aliased array
	msgs2 := Msgs(msgs0)
	null_msgs2 := msgs2.filter(it.msg_type == .null)
	dump(null_msgs2)
}

Reproduction Steps

See example code above

Expected Behavior

i think, it or other way, like closure, should support too for aliased array type

Current Behavior

Output:

code.v:33:29: error: undefined ident: `it`
   31 |     // with aliased array
   32 |     msgs2 := Msgs(msgs0)
   33 |     null_msgs2 := msgs2.filter(it.msg_type == .null)
      |                                ~~
   34 |     dump(null_msgs2)
   35 | }
Exited with error status 1

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.2 fc4c431.fae46a8

Environment details (OS name and version, etc.)

V full version: V 0.4.2 fc4c431.fae46a8
OS: linux, Ubuntu 22.04.2 LTS
Processor: 2 cpus, 64bit, little endian, Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz

getwd: /home/pmakhnev/playground
vexe: /home/pmakhnev/v/v
vexe mtime: 2023-10-03 12:00:09

vroot: OK, value: /home/pmakhnev/v
VMODULES: OK, value: /root/.vmodules
VTMP: OK, value: /tmp/v_0

Git version: git version 2.34.1
Git vroot status: 0.4.2-20-gfae46a8d-dirty (343 commit(s) behind V master)
.git/config present: true

CC version: cc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0
thirdparty/tcc status: thirdparty-linux-amd64 12f392c3

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[shove70]

Some of built-in methods for array aliases are not yet supported, I think it's because the return type of some methods is not easy to determine, such as:

Alias([]int).filter() => What type is returned?    []int？or Alias([]int)？
Alias([]int).clone()  => ditto