rollup merge of #17666 : eddyb/take-garbage-out

Conflicts:
	src/libcollections/lib.rs
	src/libcore/lib.rs
	src/librustdoc/lib.rs
	src/librustrt/lib.rs
	src/libserialize/lib.rs
	src/libstd/lib.rs
	src/test/run-pass/issue-8898.rs

src/librustdoc/html/format.rs

@@ -476,7 +476,7 @@ impl fmt::Show for clean::Type {
                 };
                 write!(f, "&{}{}{}", lt, MutableSpace(mutability), **ty)
             }
-            clean::Unique(..) | clean::Managed(..) => {
+            clean::Unique(..) => {
                 fail!("should have been cleaned")
             }
         }