fn add_fields<'a>(&mut self, fields: impl IntoIterator<Item = &'a Field>) -> &mut Self {
        self.fields_mut()
            .extend(fields.into_iter().map(ToOwned::to_owned));
        self
    }
/// Add multiple fields at once.
Add multiple fields at once.
Add multiple fields at once .
fn add_fields<'a>(&mut self, fields: impl IntoIterator<Item = &'a Field>) -> &mut Self {
        self.fields_mut()
            .extend(fields.into_iter().map(ToOwned::to_owned));
        self
    }
fn add_fields < ' a > ( & mut self , fields : impl IntoIterator < Item = & ' a Field > ) -> & mut Self { self . fields_mut ( ) . extend ( fields . into_iter ( ) . map ( ToOwned :: to_owned ) ) ; self }
Add multiple fields at once.
Add multiple fields at once .
&mut self
fields
impl IntoIterator<Item = &'a Field>