use crate::util::check_builtin_macro_attribute;
use rustc_expand::base::*;
+use rustc_span::source_map::respan;
+use rustc_span::symbol::{sym, Symbol};
use rustc_span::Span;
use syntax::ast;
use syntax::attr;
use syntax::print::pprust;
-use syntax::source_map::respan;
-use syntax::symbol::{sym, Symbol};
use std::iter;