{"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"impl<T,"}]}
impl<T, V> FromIterator<(Idx<V>, T)> for ArenaMap<Idx<V>, T> {
    fn from_iter<I: IntoIterator<Item = (Idx<V>, T)>>(iter: I) -> Self {