Test vlib/v/tests/aliases/modules/value/value_test.v failed in a single file

[Krchi]

Describe the bug

It's ok in test, but failed in a single main file
same problem in playground, https://play.vlang.io/p/2222017414

Reproduction Steps

module main

pub interface Value {
	str() string
}

pub type List = []Value

pub fn (x List) str() string {
	return x.str()
}

fn main() {
	mut list := make_list()!
	assert (list as List).len == 0
}

fn make_list() !Value {
	mut list := List{}
	return list
}

Expected Behavior

compile the code

Current Behavior

/Users/krchi/Desktop/vlang/v /Users/krchi/Documents/v_demo/examples/hello -color -g -no-parallel -no-retry-compilation -keepc -g -keepc
examples/hello/hello.v:21:2: error: `[]Value` doesn't implement method `str` of interface `Value`
   19 | fn make_list() !Value {
   20 |     mut list := List{}
   21 |     return list
      |     ~~~~~~~~~~~
   22 | }

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.12 0aa3e2d

Environment details (OS name and version, etc.)

mac

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