A Swift operator to only assign a value when the right operand is not nil

OptionalAssignment.swift

import Foundation

precedencegroup OptionalAssignment {
    associativity: right
}

infix operator ?=: OptionalAssignment

public func ?= <T>(variable: inout T, value: T?) {
    if let unwrapped = unwrap(any: value) ?? nil {
        variable = unwrapped
    }
}

public func unwrap<T: Any>(any: T) -> T? {
    let mirror = Mirror(reflecting: any)
    guard mirror.displayStyle == .optional else { return any }
    guard let child = mirror.children.first else { return nil }
    return unwrap(any: child.value) as? T
}