Pass attributes to hir::TyParam

src/librustc/hir/lowering.rs

@@ -1585,6 +1585,7 @@ impl<'a> LoweringContext<'a> {
                                .filter(|attr| attr.check_name("rustc_synthetic"))
                                .map(|_| hir::SyntheticTyParamKind::ImplTrait)
                                .nth(0),
+            attrs: self.lower_attrs(&tp.attrs),
         }
     }
 

src/librustc/hir/map/mod.rs

@@ -962,6 +962,7 @@ impl<'hir> Map<'hir> {
             Some(NodeField(ref f)) => Some(&f.attrs[..]),
             Some(NodeExpr(ref e)) => Some(&*e.attrs),
             Some(NodeStmt(ref s)) => Some(s.node.attrs()),
+            Some(NodeTyParam(tp)) => Some(&tp.attrs[..]),
             // unit/tuple structs take the attributes straight from
             // the struct definition.
             Some(NodeStructCtor(_)) => {

src/librustc/hir/mod.rs

@@ -414,6 +414,7 @@ pub struct TyParam {
     pub span: Span,
     pub pure_wrt_drop: bool,
     pub synthetic: Option<SyntheticTyParamKind>,
+    pub attrs: HirVec<Attribute>,
 }
 
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]