unused import `as _` conflicts with unused function param `_`

[dy-tea]

Describe the bug

Code: https://play.vlang.io/p/98db9a819d

import os as _

fn test_fn(_ int) {}

fn main() {
	test_fn(12)
}

Reproduction Steps

See included code.

Expected Behavior

Should not conflict. The _ should not correspond to a module name.

Current Behavior

Output:

code.v:3:12: error: duplicate of an import symbol `_`
    1 | import os as _
    2 | 
    3 | fn test_fn(_ int) {}
      |            ^
    4 | 
    5 | fn main() {
Exited with error status 1

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.12 2e983cf

Environment details (OS name and version, etc.)

|V full version      |V 0.4.12 2e983cf8f9e78696a95f5123f2f9ebeadfcaa72d
|:-------------------|:-------------------
|OS                  |linux, Debian GNU/Linux 12 (bookworm) (VM)
|Processor           |2 cpus, 64bit, little endian, Intel(R) Xeon(R) CPU E5-2680 v4 @ 2.40GHz
|Memory              |0.56GB/2.02GB
|                    |
|V executable        |/home/admin/v/v
|V last modified time|2025-12-30 23:25:31
|                    |
|V home dir          |OK, value: /home/admin/v
|VMODULES            |OK, value: .vmodules
|VTMP                |OK, value: /tmp/v_0
|Current working dir |OK, value: /home/admin/playground
|                    |
|Git version         |git version 2.39.5
|V git status        |N/A
|.git/config present |true
|                    |
|cc version          |cc (Debian 12.2.0-14+deb12u1) 12.2.0
|gcc version         |gcc (Debian 12.2.0-14+deb12u1) 12.2.0
|clang version       |Debian clang version 14.0.6
|tcc version         |tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
|tcc git status      |Error: fatal: detected dubious ownership in repository at '/home/admin/v/thirdparty/tcc'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v/thirdparty/tcc
 Error: fatal: detected dubious ownership in repository at '/home/admin/v/thirdparty/tcc'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v/thirdparty/tcc

|emcc version        |N/A
|glibc version       |ldd (Debian GLIBC 2.36-9+deb12u10) 2.36

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