diff --git a/src/librustc/middle/lang_items.rs b/src/librustc/middle/lang_items.rs
index a22ad7a0707c2..477aa14dfc4ac 100644
--- a/src/librustc/middle/lang_items.rs
+++ b/src/librustc/middle/lang_items.rs
@@ -120,9 +120,9 @@ impl LanguageItems {
 
     pub fn fn_trait_kind(&self, id: DefId) -> Option<ty::ClosureKind> {
         let def_id_kinds = [
-            (self.fn_trait(), ty::FnClosureKind),
-            (self.fn_mut_trait(), ty::FnMutClosureKind),
-            (self.fn_once_trait(), ty::FnOnceClosureKind),
+            (self.fn_trait(), ty::ClosureKind::Fn),
+            (self.fn_mut_trait(), ty::ClosureKind::FnMut),
+            (self.fn_once_trait(), ty::ClosureKind::FnOnce),
             ];
 
         for &(opt_def_id, kind) in &def_id_kinds {
diff --git a/src/librustc/middle/mem_categorization.rs b/src/librustc/middle/mem_categorization.rs
index affd963fb7917..f4da515877cbf 100644
--- a/src/librustc/middle/mem_categorization.rs
+++ b/src/librustc/middle/mem_categorization.rs
@@ -669,13 +669,13 @@ impl<'t, 'a,'tcx> MemCategorizationContext<'t, 'a, 'tcx> {
         // conceptually a `&mut` or `&` reference, so we have to add a
         // deref.
         let cmt_result = match kind {
-            ty::FnOnceClosureKind => {
+            ty::ClosureKind::FnOnce => {
                 cmt_result
             }
-            ty::FnMutClosureKind => {
+            ty::ClosureKind::FnMut => {
                 self.env_deref(id, span, upvar_id, var_mutbl, ty::MutBorrow, cmt_result)
             }
-            ty::FnClosureKind => {
+            ty::ClosureKind::Fn => {
                 self.env_deref(id, span, upvar_id, var_mutbl, ty::ImmBorrow, cmt_result)
             }
         };
@@ -1633,9 +1633,9 @@ impl fmt::Debug for Upvar {
 impl fmt::Display for Upvar {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let kind = match self.kind {
-            ty::FnClosureKind => "Fn",
-            ty::FnMutClosureKind => "FnMut",
-            ty::FnOnceClosureKind => "FnOnce",
+            ty::ClosureKind::Fn => "Fn",
+            ty::ClosureKind::FnMut => "FnMut",
+            ty::ClosureKind::FnOnce => "FnOnce",
         };
         write!(f, "captured outer variable in an `{}` closure", kind)
     }
diff --git a/src/librustc/middle/ty/mod.rs b/src/librustc/middle/ty/mod.rs
index e3357aabd5dd5..84885f3d929a1 100644
--- a/src/librustc/middle/ty/mod.rs
+++ b/src/librustc/middle/ty/mod.rs
@@ -9,7 +9,6 @@
 // except according to those terms.
 
 pub use self::ImplOrTraitItemId::*;
-pub use self::ClosureKind::*;
 pub use self::Variance::*;
 pub use self::DtorKind::*;
 pub use self::ImplOrTraitItemContainer::*;
@@ -1693,19 +1692,19 @@ pub enum ClosureKind {
     // Warning: Ordering is significant here! The ordering is chosen
     // because the trait Fn is a subtrait of FnMut and so in turn, and
     // hence we order it so that Fn < FnMut < FnOnce.
-    FnClosureKind,
-    FnMutClosureKind,
-    FnOnceClosureKind,
+    Fn,
+    FnMut,
+    FnOnce,
 }
 
 impl ClosureKind {
     pub fn trait_did(&self, cx: &ctxt) -> DefId {
         let result = match *self {
-            FnClosureKind => cx.lang_items.require(FnTraitLangItem),
-            FnMutClosureKind => {
+            ClosureKind::Fn => cx.lang_items.require(FnTraitLangItem),
+            ClosureKind::FnMut => {
                 cx.lang_items.require(FnMutTraitLangItem)
             }
-            FnOnceClosureKind => {
+            ClosureKind::FnOnce => {
                 cx.lang_items.require(FnOnceTraitLangItem)
             }
         };
@@ -1719,12 +1718,12 @@ impl ClosureKind {
     /// must also implement `other`.
     pub fn extends(self, other: ty::ClosureKind) -> bool {
         match (self, other) {
-            (FnClosureKind, FnClosureKind) => true,
-            (FnClosureKind, FnMutClosureKind) => true,
-            (FnClosureKind, FnOnceClosureKind) => true,
-            (FnMutClosureKind, FnMutClosureKind) => true,
-            (FnMutClosureKind, FnOnceClosureKind) => true,
-            (FnOnceClosureKind, FnOnceClosureKind) => true,
+            (ClosureKind::Fn, ClosureKind::Fn) => true,
+            (ClosureKind::Fn, ClosureKind::FnMut) => true,
+            (ClosureKind::Fn, ClosureKind::FnOnce) => true,
+            (ClosureKind::FnMut, ClosureKind::FnMut) => true,
+            (ClosureKind::FnMut, ClosureKind::FnOnce) => true,
+            (ClosureKind::FnOnce, ClosureKind::FnOnce) => true,
             _ => false,
         }
     }
diff --git a/src/librustc_borrowck/borrowck/mod.rs b/src/librustc_borrowck/borrowck/mod.rs
index 3ca9a17686485..5ce7d23f8dce1 100644
--- a/src/librustc_borrowck/borrowck/mod.rs
+++ b/src/librustc_borrowck/borrowck/mod.rs
@@ -1009,7 +1009,7 @@ impl<'a, 'tcx> BorrowckCtxt<'a, 'tcx> {
                             Categorization::Upvar(mc::Upvar { kind, .. }) => kind,
                             _ => unreachable!()
                         };
-                        if kind == ty::FnClosureKind {
+                        if kind == ty::ClosureKind::Fn {
                             db.span_help(
                                 self.tcx.map.span(upvar_id.closure_expr_id),
                                 "consider changing this closure to take \
diff --git a/src/librustc_mir/hair/cx/expr.rs b/src/librustc_mir/hair/cx/expr.rs
index f9a9c99f63d5e..89c61700d6810 100644
--- a/src/librustc_mir/hair/cx/expr.rs
+++ b/src/librustc_mir/hair/cx/expr.rs
@@ -679,7 +679,7 @@ fn convert_var<'a, 'tcx: 'a>(cx: &mut Cx<'a, 'tcx>,
             let region = cx.tcx.mk_region(region);
 
             let self_expr = match cx.tcx.closure_kind(cx.tcx.map.local_def_id(closure_expr_id)) {
-                ty::ClosureKind::FnClosureKind => {
+                ty::ClosureKind::Fn => {
                     let ref_closure_ty =
                         cx.tcx.mk_ref(region,
                                    ty::TypeAndMut { ty: closure_ty,
@@ -698,7 +698,7 @@ fn convert_var<'a, 'tcx: 'a>(cx: &mut Cx<'a, 'tcx>,
                         }
                     }
                 }
-                ty::ClosureKind::FnMutClosureKind => {
+                ty::ClosureKind::FnMut => {
                     let ref_closure_ty =
                         cx.tcx.mk_ref(region,
                                    ty::TypeAndMut { ty: closure_ty,
@@ -717,7 +717,7 @@ fn convert_var<'a, 'tcx: 'a>(cx: &mut Cx<'a, 'tcx>,
                         }
                     }
                 }
-                ty::ClosureKind::FnOnceClosureKind => {
+                ty::ClosureKind::FnOnce => {
                     Expr {
                         ty: closure_ty,
                         temp_lifetime: temp_lifetime,
diff --git a/src/librustc_mir/mir_map.rs b/src/librustc_mir/mir_map.rs
index 0e641bf679d11..02a0ca224b00e 100644
--- a/src/librustc_mir/mir_map.rs
+++ b/src/librustc_mir/mir_map.rs
@@ -247,15 +247,15 @@ fn closure_self_ty<'a, 'tcx>(tcx: &ty::ctxt<'tcx>,
     let region = tcx.mk_region(region);
 
     match tcx.closure_kind(tcx.map.local_def_id(closure_expr_id)) {
-        ty::ClosureKind::FnClosureKind =>
+        ty::ClosureKind::Fn =>
             tcx.mk_ref(region,
                        ty::TypeAndMut { ty: closure_ty,
                                         mutbl: hir::MutImmutable }),
-        ty::ClosureKind::FnMutClosureKind =>
+        ty::ClosureKind::FnMut =>
             tcx.mk_ref(region,
                        ty::TypeAndMut { ty: closure_ty,
                                         mutbl: hir::MutMutable }),
-        ty::ClosureKind::FnOnceClosureKind =>
+        ty::ClosureKind::FnOnce =>
             closure_ty
     }
 }
diff --git a/src/librustc_trans/trans/base.rs b/src/librustc_trans/trans/base.rs
index 4748c62921de6..e0c4bcf130846 100644
--- a/src/librustc_trans/trans/base.rs
+++ b/src/librustc_trans/trans/base.rs
@@ -218,13 +218,13 @@ pub fn self_type_for_closure<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
                                        -> Ty<'tcx> {
     let closure_kind = ccx.tcx().closure_kind(closure_id);
     match closure_kind {
-        ty::FnClosureKind => {
+        ty::ClosureKind::Fn => {
             ccx.tcx().mk_imm_ref(ccx.tcx().mk_region(ty::ReStatic), fn_ty)
         }
-        ty::FnMutClosureKind => {
+        ty::ClosureKind::FnMut => {
             ccx.tcx().mk_mut_ref(ccx.tcx().mk_region(ty::ReStatic), fn_ty)
         }
-        ty::FnOnceClosureKind => fn_ty,
+        ty::ClosureKind::FnOnce => fn_ty,
     }
 }
 
diff --git a/src/librustc_trans/trans/callee.rs b/src/librustc_trans/trans/callee.rs
index 29821384ae936..fe9bb6feff9b0 100644
--- a/src/librustc_trans/trans/callee.rs
+++ b/src/librustc_trans/trans/callee.rs
@@ -270,8 +270,8 @@ pub fn trans_fn_pointer_shim<'a, 'tcx>(
 
     // If this is an impl of `Fn` or `FnMut` trait, the receiver is `&self`.
     let is_by_ref = match closure_kind {
-        ty::FnClosureKind | ty::FnMutClosureKind => true,
-        ty::FnOnceClosureKind => false,
+        ty::ClosureKind::Fn | ty::ClosureKind::FnMut => true,
+        ty::ClosureKind::FnOnce => false,
     };
     let bare_fn_ty_maybe_ref = if is_by_ref {
         tcx.mk_imm_ref(tcx.mk_region(ty::ReStatic), bare_fn_ty)
diff --git a/src/librustc_trans/trans/closure.rs b/src/librustc_trans/trans/closure.rs
index 7c978cb275e25..1ec9535c5a36b 100644
--- a/src/librustc_trans/trans/closure.rs
+++ b/src/librustc_trans/trans/closure.rs
@@ -49,7 +49,7 @@ fn load_closure_environment<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
     let closure_ty = node_id_type(bcx, bcx.fcx.id);
     let self_type = self_type_for_closure(bcx.ccx(), closure_def_id, closure_ty);
     let kind = kind_for_closure(bcx.ccx(), closure_def_id);
-    let llenv = if kind == ty::FnOnceClosureKind &&
+    let llenv = if kind == ty::ClosureKind::FnOnce &&
             !arg_is_indirect(bcx.ccx(), self_type) {
         let datum = rvalue_scratch_datum(bcx,
                                          self_type,
@@ -85,7 +85,7 @@ fn load_closure_environment<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
         let node_id = freevar.def.var_id();
         bcx.fcx.llupvars.borrow_mut().insert(node_id, upvar_ptr);
 
-        if kind == ty::FnOnceClosureKind && !captured_by_ref {
+        if kind == ty::ClosureKind::FnOnce && !captured_by_ref {
             let hint = bcx.fcx.lldropflag_hints.borrow().hint_datum(upvar_id.var_id);
             bcx.fcx.schedule_drop_mem(arg_scope_id,
                                       upvar_ptr,
@@ -300,20 +300,20 @@ fn trans_closure_adapter_shim<'a, 'tcx>(
            ccx.tn().val_to_string(llfn));
 
     match (llfn_closure_kind, trait_closure_kind) {
-        (ty::FnClosureKind, ty::FnClosureKind) |
-        (ty::FnMutClosureKind, ty::FnMutClosureKind) |
-        (ty::FnOnceClosureKind, ty::FnOnceClosureKind) => {
+        (ty::ClosureKind::Fn, ty::ClosureKind::Fn) |
+        (ty::ClosureKind::FnMut, ty::ClosureKind::FnMut) |
+        (ty::ClosureKind::FnOnce, ty::ClosureKind::FnOnce) => {
             // No adapter needed.
             llfn
         }
-        (ty::FnClosureKind, ty::FnMutClosureKind) => {
+        (ty::ClosureKind::Fn, ty::ClosureKind::FnMut) => {
             // The closure fn `llfn` is a `fn(&self, ...)`.  We want a
             // `fn(&mut self, ...)`. In fact, at trans time, these are
             // basically the same thing, so we can just return llfn.
             llfn
         }
-        (ty::FnClosureKind, ty::FnOnceClosureKind) |
-        (ty::FnMutClosureKind, ty::FnOnceClosureKind) => {
+        (ty::ClosureKind::Fn, ty::ClosureKind::FnOnce) |
+        (ty::ClosureKind::FnMut, ty::ClosureKind::FnOnce) => {
             // The closure fn `llfn` is a `fn(&self, ...)` or `fn(&mut
             // self, ...)`.  We want a `fn(self, ...)`. We can produce
             // this by doing something like:
diff --git a/src/librustc_typeck/check/method/probe.rs b/src/librustc_typeck/check/method/probe.rs
index 3cf182a0d8ff6..909de34d1c473 100644
--- a/src/librustc_typeck/check/method/probe.rs
+++ b/src/librustc_typeck/check/method/probe.rs
@@ -697,11 +697,11 @@ impl<'a,'tcx> ProbeContext<'a,'tcx> {
         // Check if this is one of the Fn,FnMut,FnOnce traits.
         let tcx = self.tcx();
         let kind = if Some(trait_def_id) == tcx.lang_items.fn_trait() {
-            ty::FnClosureKind
+            ty::ClosureKind::Fn
         } else if Some(trait_def_id) == tcx.lang_items.fn_mut_trait() {
-            ty::FnMutClosureKind
+            ty::ClosureKind::FnMut
         } else if Some(trait_def_id) == tcx.lang_items.fn_once_trait() {
-            ty::FnOnceClosureKind
+            ty::ClosureKind::FnOnce
         } else {
             return Ok(());
         };
diff --git a/src/librustc_typeck/check/upvar.rs b/src/librustc_typeck/check/upvar.rs
index 0b77935771e44..29daff39aa9c4 100644
--- a/src/librustc_typeck/check/upvar.rs
+++ b/src/librustc_typeck/check/upvar.rs
@@ -131,7 +131,7 @@ impl<'a,'tcx> SeedBorrowKind<'a,'tcx> {
         if !self.fcx.inh.tables.borrow().closure_kinds.contains_key(&closure_def_id) {
             self.closures_with_inferred_kinds.insert(expr.id);
             self.fcx.inh.tables.borrow_mut().closure_kinds
-                                            .insert(closure_def_id, ty::FnClosureKind);
+                                            .insert(closure_def_id, ty::ClosureKind::Fn);
             debug!("check_closure: adding closure_id={:?} to closures_with_inferred_kinds",
                    closure_def_id);
         }
@@ -301,7 +301,7 @@ impl<'a,'tcx> AdjustBorrowKind<'a,'tcx> {
                                upvar_id);
 
                         // to move out of an upvar, this must be a FnOnce closure
-                        self.adjust_closure_kind(upvar_id.closure_expr_id, ty::FnOnceClosureKind);
+                        self.adjust_closure_kind(upvar_id.closure_expr_id, ty::ClosureKind::FnOnce);
 
                         let upvar_capture_map =
                             &mut self.fcx.inh.tables.borrow_mut().upvar_capture_map;
@@ -314,7 +314,7 @@ impl<'a,'tcx> AdjustBorrowKind<'a,'tcx> {
                         // must still adjust the kind of the closure
                         // to be a FnOnce closure to permit moves out
                         // of the environment.
-                        self.adjust_closure_kind(upvar_id.closure_expr_id, ty::FnOnceClosureKind);
+                        self.adjust_closure_kind(upvar_id.closure_expr_id, ty::ClosureKind::FnOnce);
                     }
                     mc::NoteNone => {
                     }
@@ -418,7 +418,7 @@ impl<'a,'tcx> AdjustBorrowKind<'a,'tcx> {
                 }
 
                 // also need to be in an FnMut closure since this is not an ImmBorrow
-                self.adjust_closure_kind(upvar_id.closure_expr_id, ty::FnMutClosureKind);
+                self.adjust_closure_kind(upvar_id.closure_expr_id, ty::ClosureKind::FnMut);
 
                 true
             }
@@ -426,7 +426,7 @@ impl<'a,'tcx> AdjustBorrowKind<'a,'tcx> {
                 // this kind of deref occurs in a `move` closure, or
                 // for a by-value upvar; in either case, to mutate an
                 // upvar, we need to be an FnMut closure
-                self.adjust_closure_kind(upvar_id.closure_expr_id, ty::FnMutClosureKind);
+                self.adjust_closure_kind(upvar_id.closure_expr_id, ty::ClosureKind::FnMut);
 
                 true
             }
@@ -488,16 +488,16 @@ impl<'a,'tcx> AdjustBorrowKind<'a,'tcx> {
                closure_id, existing_kind, new_kind);
 
         match (existing_kind, new_kind) {
-            (ty::FnClosureKind, ty::FnClosureKind) |
-            (ty::FnMutClosureKind, ty::FnClosureKind) |
-            (ty::FnMutClosureKind, ty::FnMutClosureKind) |
-            (ty::FnOnceClosureKind, _) => {
+            (ty::ClosureKind::Fn, ty::ClosureKind::Fn) |
+            (ty::ClosureKind::FnMut, ty::ClosureKind::Fn) |
+            (ty::ClosureKind::FnMut, ty::ClosureKind::FnMut) |
+            (ty::ClosureKind::FnOnce, _) => {
                 // no change needed
             }
 
-            (ty::FnClosureKind, ty::FnMutClosureKind) |
-            (ty::FnClosureKind, ty::FnOnceClosureKind) |
-            (ty::FnMutClosureKind, ty::FnOnceClosureKind) => {
+            (ty::ClosureKind::Fn, ty::ClosureKind::FnMut) |
+            (ty::ClosureKind::Fn, ty::ClosureKind::FnOnce) |
+            (ty::ClosureKind::FnMut, ty::ClosureKind::FnOnce) => {
                 // new kind is stronger than the old kind
                 closure_kinds.insert(closure_def_id, new_kind);
             }