/// Internal trait used to create `MultiValues` from `Vec<T>`.
////// This trait backs `MultiValues::new<T>()`; downstream code should call the
/// inherent method instead of implementing or naming this trait directly.
#[doc(hidden)]pubtraitMultiValuesConstructor<T> {/// Builds a `MultiValues` instance from `values`.
////// # Returns
////// Returns the enum variant corresponding to `T`.
fnfrom_vec(values:Vec<T>)->Self;}