With

with.swift

@discardableResult public func with<T>(_ item: T, update: (inout T) throws -> Void) rethrows -> T {
    var copy = item
    try update(&copy)
    return copy
}
@inlinable
@discardableResult 
public func with<T>( _ value: consuming T, update: (inout T) throws -> Void) rethrows -> T {
    var copy = consume value
    try update(&copy)
    return copy
}