cgen: -skip-unused problem

[enghitalo]

Describe the bug

wrog code genered when using -skip-unused

Reproduction Steps

v -skip-unused run bug.v

import time

struct Encoder{}

fn (e &Encoder) encode_value_with_level[T](val T) string {

	str_value := val.format_rfc3339_nano()
	return str_value
}

fn main() {
	e := &Encoder{}

	assert e.encode_value_with_level(time.Time{}) != ""
}

Expected Behavior

assert pass

Current Behavior

==================
/tmp/v_1000/bug.2322882822782176217.tmp.c:6201: warning: implicit declaration of function 'time__Time_format_rfc3339'
/tmp/v_1000/bug.2322882822782176217.tmp.c:6201: error: '{' expected (got ";")
...
==================
(Use `v -cg` to print the entire error message)

builder error: 
==================
C error. This should never happen.

This is a compiler bug, please report it using `v bug file.v`.

https://github.com/vlang/v/issues/new/choose

You can also use #help on Discord: https://discord.gg/vlang

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.4 0c4611f

Environment details (OS name and version, etc.)

Ubuntu

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