Move PResult and ParseError under syn::synom
diff --git a/src/attr.rs b/src/attr.rs
index bcd99ac..fcaa7ee 100644
--- a/src/attr.rs
+++ b/src/attr.rs
@@ -326,7 +326,8 @@
 pub mod parsing {
     use super::*;
     use cursor::Cursor;
-    use {parse_error, PResult};
+    use parse_error;
+    use synom::PResult;
     use proc_macro2::{Spacing, Span, TokenNode, TokenTree};
 
     fn eq(span: Span) -> TokenTree {