Remove require_owned_box

It's unused and unnecessary

diff --git a/src/librustc/middle/lang_items.rs b/src/librustc/middle/lang_items.rs
index ad243a1061d5f082795819cc54f4da131ce912e1..645da2475c62767f62e96c5a69a97208c41c1a90 100644 (file)
--- a/src/librustc/middle/lang_items.rs
+++ b/src/librustc/middle/lang_items.rs
@@ -83,10 +83,6 @@ pub fn require(&self, it: LangItem) -> Result<DefId, String> {
         }
     }
 
-    pub fn require_owned_box(&self) -> Result<DefId, String> {
-        self.require(OwnedBoxLangItem)
-    }
-
     pub fn fn_trait_kind(&self, id: DefId) -> Option<ty::ClosureKind> {
         let def_id_kinds = [
             (self.fn_trait(), ty::ClosureKind::Fn),