Add a default impl for Set::is_superset

I also deleted a bunch of documentation that was copy/pasted from the
trait definition.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/libstd/container.rs b/src/libstd/container.rs
index 326b9fa3d33..e8ee3792dcf 100644
--- a/src/libstd/container.rs
+++ b/src/libstd/container.rs
@@ -88,7 +88,9 @@ pub trait Set<T>: Container {
     fn is_subset(&self, other: &Self) -> bool;
 
     /// Return true if the set is a superset of another
-    fn is_superset(&self, other: &Self) -> bool;
+    fn is_superset(&self, other: &Self) -> bool {
+        other.is_subset(self)
+    }
 
     // FIXME #8154: Add difference, sym. difference, intersection and union iterators
 }