Built-in function collision with user-defined error

[MCausc78]

Describe the bug

<title>

Reproduction Steps

fn main() {
    error := {0: 1, 1: 2, 2: 3}
    println(error[4] or { 42 })
}

Expected Behavior

skull.v:3:2: error: ambiguous naming to: `error`, may refer to fn `error` or variable `error`
    1 | fn main() {
    2 |     error := {0: 1, 1: 2, 2: 3}
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    3 |     println(error[4] or { 42 })

Current Behavior

==================
C:/Users/mclr/AppData/Local/Temp/v_0/skull.2730659896825627182.tmp.c:6790: warning: implicit declaration of function 'tcc_backtrace'
C:/Users/mclr/AppData/Local/Temp/v_0/skull.2730659896825627182.tmp.c:12752: error: function pointer expected
...
==================
(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

Don't name variable _v_error, but _vvar_error

Additional Information/Context

V version

V 0.4.2 ad935ca

Environment details (OS name and version, etc.)

V full version: V 0.4.2 140c838.ad935ca
OS: windows, Microsoft Windows 11 Pro v22000 64-bit
Processor: 12 cpus, 64bit, little endian, 

getwd: D:\Games\Proekti\V\openai
vexe: D:\Games\Proekti\V\v\v.exe
vexe mtime: 2023-11-08 12:30:02

vroot: OK, value: D:\Games\Proekti\V\v
VMODULES: OK, value: C:\Users\mclr\.vmodules
VTMP: OK, value: C:\Users\mclr\AppData\Local\Temp\v_0

Git version: git version 2.37.0.windows.1
Git vroot status: weekly.2023.44-83-gad935cad
.git/config present: true

CC version:
thirdparty/tcc status: thirdparty-windows-amd64 e90c2620

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