Format with rustfmt 0.7.0
diff --git a/src/file.rs b/src/file.rs
index 99a311d..9b5b11f 100644
--- a/src/file.rs
+++ b/src/file.rs
@@ -111,8 +111,8 @@
 mod printing {
     use super::*;
     use attr::FilterAttrs;
-    use quote::{ToTokens, TokenStreamExt};
     use proc_macro2::TokenStream;
+    use quote::{ToTokens, TokenStreamExt};
 
     impl ToTokens for File {
         fn to_tokens(&self, tokens: &mut TokenStream) {