rustdoc: remove handling of Gc.

src/librustdoc/clean/mod.rs

@@ -1087,7 +1087,6 @@ pub enum Type {
     /// aka TyBot
     Bottom,
     Unique(Box<Type>),
-    Managed(Box<Type>),
     RawPointer(Mutability, Box<Type>),
     BorrowedRef {
         pub lifetime: Option<Lifetime>,
@@ -1253,12 +1252,6 @@ fn clean(&self, cx: &DocContext) -> Type {
             ty::ty_float(ast::TyF32) => Primitive(F32),
             ty::ty_float(ast::TyF64) => Primitive(F64),
             ty::ty_str => Primitive(Str),
-            ty::ty_box(t) => {
-                let gc_did = cx.tcx_opt().and_then(|tcx| {
-                    tcx.lang_items.gc()
-                });
-                lang_struct(cx, gc_did, t, "Gc", Managed)
-            }
             ty::ty_uniq(t) => {
                 let box_did = cx.tcx_opt().and_then(|tcx| {
                     tcx.lang_items.owned_box()

src/librustdoc/html/format.rs

@@ -476,7 +476,7 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                 };
                 write!(f, "&{}{}{}", lt, MutableSpace(mutability), **ty)
             }
-            clean::Unique(..) | clean::Managed(..) => {
+            clean::Unique(..) => {
                 fail!("should have been cleaned")
             }
         }