fix rebase fallout

Author: Centril

src/librustc_parse/parser/attr.rs

@@ -1,10 +1,10 @@
 use super::{Parser, PathStyle, TokenType};
 use rustc_errors::PResult;
 use syntax::ast;
+use syntax::attr;
 use syntax::print::pprust;
 use syntax::token::{self, Nonterminal};
 use syntax::util::comments;
-use syntax::util::comments;
 use syntax_pos::{Span, Symbol};
 
 use log::debug;