fmt: failing on mutually exclusive $if blocks with duplicate method definitions

[fleximus]

Describe the bug

v fmt reports duplicate method error when the same method is defined in mutually exclusive $if/$else or $if flag ?/$if !flag ? blocks. The code compiles and runs correctly, but cannot be formatted.

Reproduction Steps

module main

$if foo ? {

pub fn (x int) str() string {
    return 'foo mode'
}

} $else {

pub fn (x int) str() string {
    return 'normal mode'
}

}

fn main() {
    println(42.str())
}

Steps to reproduce:

v run test.v        # works
v -d foo run test.v # works
v fmt test.v        # fails

Expected Behavior

v fmt should recognize mutually exclusive $if blocks and not report duplicate methods

Current Behavior

  test.v:10:16: error: duplicate method `str`
     8 | } $else {
     9 |
    10 | pub fn (x int) str() string {
       |                ~~~
    11 |     return 'normal mode'
    12 | }

Possible Solution

No response

Additional Information/Context

Impact: Cannot format files which use this pattern for conditional compilation.

V version

V 0.5.0 e3616f2

Environment details (OS name and version, etc.)

V full version: V 0.5.0 9a73766.e3616f2
OS: Linux

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