diff --git a/src/librustc/middle/expr_use_visitor.rs b/src/librustc/middle/expr_use_visitor.rs
index e3f4d7056bd..c7dd4dd2646 100644
--- a/src/librustc/middle/expr_use_visitor.rs
+++ b/src/librustc/middle/expr_use_visitor.rs
@@ -654,22 +654,19 @@ impl<'d,'t,'tcx,TYPER:mc::Typer<'tcx>> ExprUseVisitor<'d,'t,'tcx,TYPER> {
             }
             _ => {
                 let overloaded_call_type =
-                    match self.tcx()
-                              .method_map
-                              .borrow()
-                              .get(&MethodCall::expr(call.id)) {
-                    Some(ref method_callee) => {
-                        OverloadedCallType::from_method_origin(
-                            self.tcx(),
-                            &method_callee.origin)
-                    }
-                    None => {
-                        self.tcx().sess.span_bug(
-                            callee.span,
-                            format!("unexpected callee type {}",
-                                    callee_ty.repr(self.tcx()))[])
-                    }
-                };
+                    match self.typer.node_method_origin(MethodCall::expr(call.id)) {
+                        Some(method_origin) => {
+                            OverloadedCallType::from_method_origin(
+                                self.tcx(),
+                                &method_origin)
+                        }
+                        None => {
+                            self.tcx().sess.span_bug(
+                                callee.span,
+                                format!("unexpected callee type {}",
+                                        callee_ty.repr(self.tcx())).as_slice())
+                        }
+                    };
                 match overloaded_call_type {
                     FnMutOverloadedCall => {
                         self.borrow_expr(callee,
diff --git a/src/librustc/middle/mem_categorization.rs b/src/librustc/middle/mem_categorization.rs
index eff5433c3e5..9f7472c2c73 100644
--- a/src/librustc/middle/mem_categorization.rs
+++ b/src/librustc/middle/mem_categorization.rs
@@ -285,6 +285,8 @@ pub trait Typer<'tcx> {
     fn node_ty(&self, id: ast::NodeId) -> Ty<'tcx>;
     fn expr_ty_adjusted(&self, expr: &ast::Expr) -> Ty<'tcx>;
     fn node_method_ty(&self, method_call: ty::MethodCall) -> Option<Ty<'tcx>>;
+    fn node_method_origin(&self, method_call: ty::MethodCall)
+                          -> Option<ty::MethodOrigin<'tcx>>;
     fn adjustments<'a>(&'a self) -> &'a RefCell<NodeMap<ty::AutoAdjustment<'tcx>>>;
     fn is_method_call(&self, id: ast::NodeId) -> bool;
     fn temporary_scope(&self, rvalue_id: ast::NodeId) -> Option<region::CodeExtent>;
diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index 7add505e0eb..9cd07286735 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -3003,9 +3003,9 @@ pub fn type_contents<'tcx>(cx: &ctxt<'tcx>, ty: Ty<'tcx>) -> TypeContents {
                 // FIXME(#14449): `borrowed_contents` below assumes `&mut`
                 // unboxed closure.
                 let upvars = unboxed_closure_upvars(cx, did, substs);
-                TypeContents::union(upvars[],
-                                    |f| tc_ty(cx, f.ty, cache)) |
-                    borrowed_contents(r, MutMutable)
+                TypeContents::union(upvars.as_slice(),
+                                    |f| tc_ty(cx, f.ty, cache))
+                    | borrowed_contents(r, MutMutable)
             }
 
             ty_tup(ref tys) => {
@@ -6177,6 +6177,12 @@ impl<'tcx> mc::Typer<'tcx> for ty::ctxt<'tcx> {
         self.method_map.borrow().get(&method_call).map(|method| method.ty)
     }
 
+    fn node_method_origin(&self, method_call: ty::MethodCall)
+                          -> Option<ty::MethodOrigin<'tcx>>
+    {
+        self.method_map.borrow().get(&method_call).map(|method| method.origin.clone())
+    }
+
     fn adjustments<'a>(&'a self) -> &'a RefCell<NodeMap<ty::AutoAdjustment<'tcx>>> {
         &self.adjustments
     }
diff --git a/src/librustc_trans/trans/common.rs b/src/librustc_trans/trans/common.rs
index 64ab9448795..ea2a4ef6b28 100644
--- a/src/librustc_trans/trans/common.rs
+++ b/src/librustc_trans/trans/common.rs
@@ -479,6 +479,16 @@ impl<'blk, 'tcx> mc::Typer<'tcx> for BlockS<'blk, 'tcx> {
             .map(|method| monomorphize_type(self, method.ty))
     }
 
+    fn node_method_origin(&self, method_call: ty::MethodCall)
+                          -> Option<ty::MethodOrigin<'tcx>>
+    {
+        self.tcx()
+            .method_map
+            .borrow()
+            .get(&method_call)
+            .map(|method| method.origin.clone())
+    }
+
     fn adjustments<'a>(&'a self) -> &'a RefCell<NodeMap<ty::AutoAdjustment<'tcx>>> {
         &self.tcx().adjustments
     }
diff --git a/src/librustc_typeck/check/mod.rs b/src/librustc_typeck/check/mod.rs
index b046b39b283..535a4700854 100644
--- a/src/librustc_typeck/check/mod.rs
+++ b/src/librustc_typeck/check/mod.rs
@@ -301,6 +301,13 @@ impl<'a, 'tcx> mc::Typer<'tcx> for FnCtxt<'a, 'tcx> {
                            .map(|method| method.ty)
                            .map(|ty| self.infcx().resolve_type_vars_if_possible(&ty))
     }
+    fn node_method_origin(&self, method_call: ty::MethodCall)
+                          -> Option<ty::MethodOrigin<'tcx>>
+    {
+        self.inh.method_map.borrow()
+                           .get(&method_call)
+                           .map(|method| method.origin.clone())
+    }
     fn adjustments(&self) -> &RefCell<NodeMap<ty::AutoAdjustment<'tcx>>> {
         &self.inh.adjustments
     }