remove usage of private modules (#4664)

packages/router-macro/src/lib.rs

@@ -6,7 +6,8 @@ extern crate proc_macro;
 use layout::Layout;
 use nest::{Nest, NestId};
 use proc_macro::TokenStream;
-use quote::{__private::Span, format_ident, quote, ToTokens};
+use proc_macro2::Span;
+use quote::{format_ident, quote, ToTokens};
 use redirect::Redirect;
 use route::{Route, RouteType};
 use segment::RouteSegment;