libsyntax: De-`@mut` `TtReader::stack`
libsyntax: De-`@mut` `StringReader`, `TtReader`, and `reader`
librustc: De-`@mut` the span handler
librustc: De-`@mut` (and de-`@`) the pretty printer
librustc: De-`@mut` all writers
libsyntax: De-`@mut` `TtFrame::idx`
libsyntax: De-`@mut` `TtFrame`
libsyntax: De-`@mut` `HandlerT::err_count`
libsyntax: De-`@mut` the handler
libsyntax: De-`@mut` the resolve table
libsyntax: De-`@mut` `CurrentCommentAndLiteral`
librustc: De-`@mut` the AST map
libsyntax: De-`@mut` `name_idx`
libsyntax: De-`@mut` the path in the AST mapping context
libsyntax: De-`@mut` (and de-`@`) the AST mapping context
libsyntax: De-`@mut` the interner map
libsyntax: De-`@mut` `SCTable::table`
libsyntax: De-`@mut` `SCTable::mark_memo`
libsyntax: De-`@mut` `SCTable::rename_memo`
libsyntax: De-`@mut` `SCTable`