refactor: prepare to associate multiple spans with a module.

Author: pnkfelix

src/parse/parser.rs

@@ -113,7 +113,7 @@ impl<'a> Parser<'a> {
         let result = catch_unwind(AssertUnwindSafe(|| {
             let mut parser = new_parser_from_file(sess.inner(), path, Some(span));
             match parser.parse_mod(&TokenKind::Eof) {
-                Ok(result) => Some(result),
+                Ok((a, i, ast::ModSpans { inner_span })) => Some((a, i, inner_span)),
                 Err(mut e) => {
                     e.emit();
                     if sess.can_reset_errors() {

src/visitor.rs

@@ -915,7 +915,7 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
         let ident_str = rewrite_ident(&self.get_context(), ident).to_owned();
         self.push_str(&ident_str);
 
-        if let ast::ModKind::Loaded(ref items, ast::Inline::Yes, inner_span) = mod_kind {
+        if let ast::ModKind::Loaded(ref items, ast::Inline::Yes, ast::ModSpans{ inner_span }) = mod_kind {
             match self.config.brace_style() {
                 BraceStyle::AlwaysNextLine => {
                     let indent_str = self.block_indent.to_string_with_newline(self.config);