Enum values set with constants calculated with $if/$else can result in duplicated values

[jorgeluismireles]

Describe the bug

Two constants are calculated with $if/$else. The constants are used to set the values of two enum elements. After $if/$else the values can be equal and the enum consistency is not checked for repetition.

Reproduction Steps

const x = $if macos { 1 } $else { 2 }
const y = $if macos { 3 } $else { 2 }

enum Foo {
	foo = x
	bar = y
}

fn main() {
	println('${Foo.foo:d}') // prints 2 in linux
	println('${Foo.bar:d}') // prints 2 in linux
}

Expected Behavior

Prevent duplicated values in the enum.

Current Behavior

Enum can get duplicated values which by definition is invalid.

Possible Solution

No response

Additional Information/Context

Previously mentioned in: #23336

V version

V 0.4.9 c50d4ee

Environment details (OS name and version, etc.)

https://play.vlang.io/p/028f55a768

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_{Huly®: V_0.6-21779}

[jorgeluismireles]

More simpler case where seems pre-calculations are done later than enum checking for duplicates:

enum Num {
	x = 2*3
	y = 1*6
}
println('${Num.x:d} ${Num.y:d}') // prints 6 6