Now it compiles

Author: mrowqa

src/librustc/hir/lowering.rs

@@ -809,7 +809,7 @@ impl<'a> LoweringContext<'a> {
         }
     }
 
-    fn lower_attrs(&mut self, attrs: &Vec<Attribute>) -> hir::HirVec<Attribute> {
+    fn lower_attrs(&mut self, attrs: &[Attribute]) -> hir::HirVec<Attribute> {
         attrs.iter().map(|a| self.lower_attr(a)).collect::<Vec<_>>().into()
     }
 
@@ -1019,6 +1019,7 @@ impl<'a> LoweringContext<'a> {
                             span,
                             pure_wrt_drop: false,
                             synthetic: Some(hir::SyntheticTyParamKind::ImplTrait),
+                            attrs: P::new(),
                         });
 
                         hir::TyPath(hir::QPath::Resolved(None, P(hir::Path {

src/librustc/ich/impls_hir.rs

@@ -203,7 +203,8 @@ impl_stable_hash_for!(struct hir::TyParam {
     default,
     span,
     pure_wrt_drop,
-    synthetic
+    synthetic,
+    attrs
 });
 
 impl_stable_hash_for!(enum hir::GenericParam {