Import to support old rustc
diff --git a/src/ty.rs b/src/ty.rs
index 2a8ca73..aaaf28c 100644
--- a/src/ty.rs
+++ b/src/ty.rs
@@ -237,6 +237,7 @@
 #[cfg(feature = "parsing")]
 pub mod parsing {
     use super::*;
+    use {TyParamBound, TraitBoundModifier};
     #[cfg(feature = "full")]
     use ConstExpr;
     use constant::parsing::const_expr;