Rename 'exterior' to 'box' and 'interior' to 'local' (at least wrt. slots; keep MEM_interior for describing interior-parts-of-allocations)

17 files changed, 198 insertions, 200 deletions

diff --git a/src/boot/be/abi.ml b/src/boot/be/abi.ml
index 9108a182..44f9761b 100644
--- a/src/boot/be/abi.ml
+++ b/src/boot/be/abi.ml
@@ -26,20 +26,20 @@ let frame_glue_fns_field_mark = 0;;
 let frame_glue_fns_field_drop = 1;;
 let frame_glue_fns_field_reloc = 2;;
 
-let exterior_rc_slot_field_refcnt = 0;;
-let exterior_rc_slot_field_body = 1;;
+let box_rc_slot_field_refcnt = 0;;
+let box_rc_slot_field_body = 1;;
 
-let exterior_gc_slot_alloc_base = (-3);;
-let exterior_gc_slot_field_prev = (-3);;
-let exterior_gc_slot_field_next = (-2);;
-let exterior_gc_slot_field_ctrl = (-1);;
-let exterior_gc_slot_field_refcnt = 0;;
-let exterior_gc_slot_field_body = 1;;
+let box_gc_slot_alloc_base = (-3);;
+let box_gc_slot_field_prev = (-3);;
+let box_gc_slot_field_next = (-2);;
+let box_gc_slot_field_ctrl = (-1);;
+let box_gc_slot_field_refcnt = 0;;
+let box_gc_slot_field_body = 1;;
 
-let exterior_rc_header_size = 1;;
-let exterior_gc_header_size = 4;;
+let box_rc_header_size = 1;;
+let box_gc_header_size = 4;;
 
-let exterior_gc_malloc_return_adjustment = 3;;
+let box_gc_malloc_return_adjustment = 3;;
 
 let stk_field_valgrind_id = 0 + 1;;
 let stk_field_limit = stk_field_valgrind_id + 1;;
diff --git a/src/boot/be/x86.ml b/src/boot/be/x86.ml
index 182096ed..d18cf11f 100644
--- a/src/boot/be/x86.ml
+++ b/src/boot/be/x86.ml
@@ -829,7 +829,7 @@ let sweep_gc_chain
     emit (Il.jmp Il.JE
             (codefix exit_jmp_fix));            (* if nonzero             *)
     mov (rc ecx)                                (* Load GC ctrl word      *)
-      (c (edi_n Abi.exterior_gc_slot_field_ctrl));
+      (c (edi_n Abi.box_gc_slot_field_ctrl));
     mov (rc eax) (ro ecx);
     band (rc eax) (immi 1L);                    (* Extract mark to eax.   *)
     band                                        (* Clear mark in ecx.     *)
@@ -839,7 +839,7 @@ let sweep_gc_chain
     if clear_mark
     then
       mov                                       (* Write-back cleared.    *)
-        ((edi_n Abi.exterior_gc_slot_field_ctrl))
+        ((edi_n Abi.box_gc_slot_field_ctrl))
         (ro ecx);
 
     emit (Il.cmp (ro eax) (immi 0L));
@@ -870,7 +870,7 @@ let sweep_gc_chain
 
     mark skip_jmp_fix;
     mov (rc edi)                                (* Advance down chain     *)
-      (c (edi_n Abi.exterior_gc_slot_field_next));
+      (c (edi_n Abi.box_gc_slot_field_next));
     emit (Il.jmp Il.JMP
             (codefix repeat_jmp_fix));          (* loop                   *)
     mark exit_jmp_fix;
@@ -901,7 +901,7 @@ let gc_glue
     (* The sweep pass has two sub-passes over the GC chain:
      *
      *    - In pass #1, 'severing', we goes through and disposes of all
-     *      mutable exterior slots in each record. That is, rc-- the referent,
+     *      mutable box slots in each record. That is, rc-- the referent,
      *      and then null-out.  If the rc-- gets to zero, that just means the
      *      mutable is part of the garbage set currently being collected. But
      *      a mutable may be live-and-outside; this detaches the garbage set
diff --git a/src/boot/fe/ast.ml b/src/boot/fe/ast.ml
index 21726234..e3360f31 100644
--- a/src/boot/fe/ast.ml
+++ b/src/boot/fe/ast.ml
@@ -88,7 +88,7 @@ and ty =
   | TY_named of name
   | TY_type
 
-  | TY_exterior of ty
+  | TY_box of ty
   | TY_mutable of ty
 
   | TY_constrained of (ty * constrs)
@@ -100,7 +100,7 @@ and ty =
  *)
 
 and mode =
-  | MODE_interior
+  | MODE_local
   | MODE_alias
 
 and slot = { slot_mode: mode;
@@ -201,7 +201,7 @@ and stmt' =
   | STMT_init_str of (lval * string)
   | STMT_init_port of lval
   | STMT_init_chan of (lval * (lval option))
-  | STMT_init_exterior of (lval * atom)
+  | STMT_init_box of (lval * atom)
   | STMT_copy of (lval * expr)
   | STMT_copy_binop of (lval * binop * atom)
   | STMT_call of (lval * lval * (atom array))
@@ -523,7 +523,7 @@ and fmt_name (ff:Format.formatter) (n:name) : unit =
 and fmt_mode (ff:Format.formatter) (m:mode) : unit =
   match m with
     | MODE_alias -> fmt ff "&"
-    | MODE_interior -> ()
+    | MODE_local -> ()
 
 and fmt_slot (ff:Format.formatter) (s:slot) : unit =
   match s.slot_ty with
@@ -656,7 +656,7 @@ and fmt_ty (ff:Format.formatter) (t:ty) : unit =
   | TY_named n -> fmt_name ff n
   | TY_type -> fmt ff "type"
 
-  | TY_exterior t ->
+  | TY_box t ->
       fmt ff "@@";
       fmt_ty ff t
 
@@ -1167,7 +1167,7 @@ and fmt_stmt_body (ff:Format.formatter) (s:stmt) : unit =
           fmt_lval ff t;
           fmt ff ";"
 
-      | STMT_init_exterior (lv, at) ->
+      | STMT_init_box (lv, at) ->
           fmt_lval ff lv;
           fmt ff " = @@";
           fmt_atom ff at;
diff --git a/src/boot/fe/item.ml b/src/boot/fe/item.ml
index 5c0a7c65..658fb8c4 100644
--- a/src/boot/fe/item.ml
+++ b/src/boot/fe/item.ml
@@ -242,7 +242,7 @@ and parse_stmts (ps:pstate) : Ast.stmt array =
                               match name with
                                   Ast.NAME_base (Ast.BASE_ident ident) ->
                                     let slot =
-                                      { Ast.slot_mode = Ast.MODE_interior;
+                                      { Ast.slot_mode = Ast.MODE_local;
                                         Ast.slot_ty = None }
                                     in
                                       Ast.PAT_slot
diff --git a/src/boot/fe/parser.ml b/src/boot/fe/parser.ml
index 97cf8985..ab7ff56c 100644
--- a/src/boot/fe/parser.ml
+++ b/src/boot/fe/parser.ml
@@ -180,12 +180,12 @@ let err (str:string) (ps:pstate) =
 
 
 let (slot_nil:Ast.slot) =
-  { Ast.slot_mode = Ast.MODE_interior;
+  { Ast.slot_mode = Ast.MODE_local;
     Ast.slot_ty = Some Ast.TY_nil }
 ;;
 
 let (slot_auto:Ast.slot) =
-  { Ast.slot_mode = Ast.MODE_interior;
+  { Ast.slot_mode = Ast.MODE_local;
     Ast.slot_ty = None }
 ;;
 
diff --git a/src/boot/fe/pexp.ml b/src/boot/fe/pexp.ml
index d02a5f6d..1869a7d3 100644
--- a/src/boot/fe/pexp.ml
+++ b/src/boot/fe/pexp.ml
@@ -33,7 +33,7 @@ type pexp' =
   | PEXP_lit of Ast.lit
   | PEXP_str of string
   | PEXP_mutable of pexp
-  | PEXP_exterior of pexp
+  | PEXP_box of pexp
   | PEXP_custom of Ast.name * (pexp array) * (string option)
 
 and plval =
@@ -334,7 +334,7 @@ and parse_atomic_ty (ps:pstate) : Ast.ty =
 
     | AT ->
         bump ps;
-        Ast.TY_exterior (parse_ty ps)
+        Ast.TY_box (parse_ty ps)
 
     | MUTABLE ->
         bump ps;
@@ -368,7 +368,7 @@ and parse_slot (aliases_ok:bool) (ps:pstate) : Ast.slot =
   match (peek ps, aliases_ok) with
       (AND, true) -> bump ps; Ast.MODE_alias
     | (AND, false) -> raise (err "alias slot in prohibited context" ps)
-    | _ -> Ast.MODE_interior
+    | _ -> Ast.MODE_local
   in
   let ty = parse_ty ps in
     { Ast.slot_mode = mode;
@@ -485,7 +485,7 @@ and parse_bottom_pexp (ps:pstate) : pexp =
         bump ps;
         let inner = parse_pexp ps in
         let bpos = lexpos ps in
-          span ps apos bpos (PEXP_exterior inner)
+          span ps apos bpos (PEXP_box inner)
 
     | TUP ->
         bump ps;
@@ -1102,7 +1102,7 @@ and desugar_expr_atom
       | PEXP_bind _
       | PEXP_spawn _
       | PEXP_custom _
-      | PEXP_exterior _
+      | PEXP_box _
       | PEXP_mutable _ ->
           let (_, tmp, decl_stmt) = build_tmp ps slot_auto apos bpos in
           let stmts = desugar_expr_init ps tmp pexp in
@@ -1299,11 +1299,11 @@ and desugar_expr_init
           in
             aa port_stmts [| chan_stmt |]
 
-      | PEXP_exterior arg ->
+      | PEXP_box arg ->
           let (arg_stmts, arg_mode_atom) =
             desugar_expr_atom ps arg
           in
-          let stmt = ss (Ast.STMT_init_exterior (dst_lval, arg_mode_atom)) in
+          let stmt = ss (Ast.STMT_init_box (dst_lval, arg_mode_atom)) in
             aa arg_stmts [| stmt |]
 
       | PEXP_mutable arg ->
diff --git a/src/boot/llvm/lltrans.ml b/src/boot/llvm/lltrans.ml
index 0a5706cc..c699ae21 100644
--- a/src/boot/llvm/lltrans.ml
+++ b/src/boot/llvm/lltrans.ml
@@ -263,7 +263,7 @@ let trans_crate
       | Ast.TY_chan _ | Ast.TY_port _ | Ast.TY_task  ->
           p rc_opaque_ty
 
-      | Ast.TY_exterior t ->
+      | Ast.TY_box t ->
           (* FIXME: wrong, this needs to point to a refcounted cell. *)
           p (trans_ty t)
 
@@ -296,7 +296,7 @@ let trans_crate
       match slot.Ast.slot_mode with
         | Ast.MODE_alias _ ->
             Llvm.pointer_type base_llty
-        | Ast.MODE_interior _ -> base_llty
+        | Ast.MODE_local _ -> base_llty
   in
 
   let get_element_ptr
@@ -453,7 +453,7 @@ let trans_crate
                 llbuilder :=
                   if_ptr_in_slot_not_null
                     (decr_refcnt_and_if_zero
-                       Abi.exterior_rc_slot_field_refcnt
+                       Abi.box_rc_slot_field_refcnt
                        free_and_null_out_slot)
                     (!llbuilder)
 
@@ -461,11 +461,11 @@ let trans_crate
                 llbuilder :=
                   if_ptr_in_slot_not_null
                     (decr_refcnt_and_if_zero
-                       Abi.exterior_rc_slot_field_refcnt
+                       Abi.box_rc_slot_field_refcnt
                        free_and_null_out_slot)
                     (!llbuilder)
 
-            | MEM_interior when Semant.type_is_structured ty ->
+            | MEM_local when Semant.type_is_structured ty ->
                 (* FIXME: to handle recursive types, need to call drop
                    glue here, not inline. *)
                 drop_ty llbuilder lltask slot_ptr ty curr_iso
@@ -562,7 +562,7 @@ let trans_crate
     Array.iteri build_arg (Llvm.params llfn);
 
     (* Allocate space for all the blocks' slots.
-     * and zero the exteriors. *)
+     * and zero the box pointers. *)
     let init_block (block_id:node_id) : unit =
       let init_slot
           (key:Ast.slot_key)
diff --git a/src/boot/me/dwarf.ml b/src/boot/me/dwarf.ml
index 663ce9f5..f49f450a 100644
--- a/src/boot/me/dwarf.ml
+++ b/src/boot/me/dwarf.ml
@@ -1323,7 +1323,7 @@ let (abbrev_mutable_type:abbrev) =
    |])
 ;;
 
-let (abbrev_exterior_type:abbrev) =
+let (abbrev_box_type:abbrev) =
   (DW_TAG_pointer_type, DW_CHILDREN_no,
    [|
      (DW_AT_type, DW_FORM_ref_addr);
@@ -1551,7 +1551,7 @@ let dwarf_visitor
       in
 
         match slot.Ast.slot_mode with
-          | Ast.MODE_interior ->
+          | Ast.MODE_local ->
               ref_type_die (slot_ty slot)
 
           | Ast.MODE_alias ->
@@ -2013,20 +2013,19 @@ let dwarf_visitor
         ref_addr_for_fix (Stack.top iso_stack).(i)
       in
 
-      let exterior_type t =
-        let fix = new_fixup "exterior DIE" in
+      let box_type t =
+        let fix = new_fixup "box DIE" in
         let body_off =
-          word_sz_int * Abi.exterior_rc_slot_field_body
+          word_sz_int * Abi.box_rc_slot_field_body
         in
           emit_die (DEF (fix, SEQ [|
-                           uleb (get_abbrev_code abbrev_exterior_type);
+                           uleb (get_abbrev_code abbrev_box_type);
                            (* DW_AT_type: DW_FORM_ref_addr *)
                            (ref_type_die t);
                            (* DW_AT_data_location: DW_FORM_block1 *)
-                           (* This is a DWARF expression for moving
-                              from the address of an exterior
-                              allocation to the address of its
-                              body. *)
+                           (* This is a DWARF expression for moving from the
+                              address of a box allocation to the address of
+                              its body. *)
                            dw_form_block1
                              [| DW_OP_push_object_address;
                                 DW_OP_lit body_off;
@@ -2078,7 +2077,7 @@ let dwarf_visitor
           | Ast.TY_param p -> rust_type_param p
           | Ast.TY_obj ob -> obj_type ob
           | Ast.TY_mutable t -> mutable_type t
-          | Ast.TY_exterior t -> exterior_type t
+          | Ast.TY_box t -> box_type t
           | _ ->
               bug () "unimplemented dwarf encoding for type %a"
                 Ast.sprintf_ty ty
@@ -2916,7 +2915,7 @@ let rec extract_mod_items
             Ast.TY_native (get_opaque_of (get_native_id die))
 
         | DW_TAG_pointer_type ->
-            Ast.TY_exterior (get_referenced_ty die)
+            Ast.TY_box (get_referenced_ty die)
 
         | DW_TAG_const_type
             when ((get_num die DW_AT_mutable) = 1) ->
@@ -3012,7 +3011,7 @@ let rec extract_mod_items
               Ast.slot_ty = Some ty }
       | _ ->
           let ty = get_ty die in
-            { Ast.slot_mode = Ast.MODE_interior;
+            { Ast.slot_mode = Ast.MODE_local;
               Ast.slot_ty = Some ty }
 
   and get_referenced_ty die =
diff --git a/src/boot/me/layout.ml b/src/boot/me/layout.ml
index 6c4567fd..208dc470 100644
--- a/src/boot/me/layout.ml
+++ b/src/boot/me/layout.ml
@@ -221,7 +221,7 @@ let layout_visitor
     let offset =
       let word_sz = cx.ctxt_abi.Abi.abi_word_sz in
       let word_n (n:int) = Int64.mul word_sz (Int64.of_int n) in
-        SIZE_fixed (word_n (Abi.exterior_rc_slot_field_body
+        SIZE_fixed (word_n (Abi.box_rc_slot_field_body
                             + 1 (* the state tydesc. *)))
     in
       log cx "laying out object-state for node #%d at offset %s"
@@ -262,7 +262,7 @@ let layout_visitor
    *)
 
   let glue_callsz =
-    let word = interior_slot Ast.TY_int in
+    let word = local_slot Ast.TY_int in
     let glue_fn =
       mk_simple_ty_fn
         (Array.init Abi.worst_case_glue_call_args (fun _ -> word))
diff --git a/src/boot/me/resolve.ml b/src/boot/me/resolve.ml
index 2e422d1e..72558ae6 100644
--- a/src/boot/me/resolve.ml
+++ b/src/boot/me/resolve.ml
@@ -570,7 +570,7 @@ let type_resolving_visitor
                           header_slots
                       in
                       let output_slot =
-                        interior_slot (ty_iso_of cx recursive_tag_groups
+                        local_slot (ty_iso_of cx recursive_tag_groups
                                          all_tags nid)
                       in
                       let ty =
diff --git a/src/boot/me/semant.ml b/src/boot/me/semant.ml
index 19ef774d..e70fd55f 100644
--- a/src/boot/me/semant.ml
+++ b/src/boot/me/semant.ml
@@ -21,10 +21,10 @@ type glue =
   | GLUE_exit_main_task
   | GLUE_exit_task
   | GLUE_copy of Ast.ty           (* One-level copy.                    *)
-  | GLUE_drop of Ast.ty           (* De-initialize interior memory.     *)
-  | GLUE_free of Ast.ty           (* Drop body + free() exterior ptr.   *)
-  | GLUE_sever of Ast.ty          (* Null all exterior state slots.     *)
-  | GLUE_mark of Ast.ty           (* Mark all exterior state slots.     *)
+  | GLUE_drop of Ast.ty           (* De-initialize local memory.        *)
+  | GLUE_free of Ast.ty           (* Drop body + free() box ptr.        *)
+  | GLUE_sever of Ast.ty          (* Null all box state slots.          *)
+  | GLUE_mark of Ast.ty           (* Mark all box state slots.          *)
   | GLUE_clone of Ast.ty          (* Deep copy.                         *)
   | GLUE_compare of Ast.ty
   | GLUE_hash of Ast.ty
@@ -604,35 +604,35 @@ let expr_slots (cx:ctxt) (e:Ast.expr) : node_id array =
 
 (* Type extraction. *)
 
-let interior_slot_full mut ty : Ast.slot =
+let local_slot_full mut ty : Ast.slot =
   let ty =
     if mut
     then Ast.TY_mutable ty
     else ty
   in
-    { Ast.slot_mode = Ast.MODE_interior;
+    { Ast.slot_mode = Ast.MODE_local;
       Ast.slot_ty = Some ty }
 ;;
 
-let exterior_slot_full mut ty : Ast.slot =
+let box_slot_full mut ty : Ast.slot =
   let ty =
     match ty with
-        Ast.TY_exterior _ -> ty
-      | _ -> Ast.TY_exterior ty
+        Ast.TY_box _ -> ty
+      | _ -> Ast.TY_box ty
   in
   let ty =
     if mut
     then Ast.TY_mutable ty
     else ty
   in
-  { Ast.slot_mode = Ast.MODE_interior;
+  { Ast.slot_mode = Ast.MODE_local;
     Ast.slot_ty = Some ty }
 ;;
 
-let interior_slot ty : Ast.slot = interior_slot_full false ty
+let local_slot ty : Ast.slot = local_slot_full false ty
 ;;
 
-let exterior_slot ty : Ast.slot = exterior_slot_full false ty
+let box_slot ty : Ast.slot = box_slot_full false ty
 ;;
 
 
@@ -640,7 +640,7 @@ let exterior_slot ty : Ast.slot = exterior_slot_full false ty
 
 type ('ty, 'tys, 'slot, 'slots, 'tag) ty_fold =
     {
-      (* Functions that correspond to interior nodes in Ast.ty. *)
+      (* Functions that correspond to local nodes in Ast.ty. *)
       ty_fold_slot : (Ast.mode * 'ty) -> 'slot;
       ty_fold_slots : ('slot array) -> 'slots;
       ty_fold_tys : ('ty array) -> 'tys;
@@ -672,7 +672,7 @@ type ('ty, 'tys, 'slot, 'slots, 'tag) ty_fold =
       ty_fold_param : (int * Ast.effect) -> 'ty;
       ty_fold_named : Ast.name -> 'ty;
       ty_fold_type : unit -> 'ty;
-      ty_fold_exterior : 'ty -> 'ty;
+      ty_fold_box : 'ty -> 'ty;
       ty_fold_mutable : 'ty -> 'ty;
       ty_fold_constrained : ('ty * Ast.constrs) -> 'ty }
 ;;
@@ -739,7 +739,7 @@ let rec fold_ty
   | Ast.TY_named n -> f.ty_fold_named n
   | Ast.TY_type -> f.ty_fold_type ()
 
-  | Ast.TY_exterior t -> f.ty_fold_exterior (fold_ty f t)
+  | Ast.TY_box t -> f.ty_fold_box (fold_ty f t)
   | Ast.TY_mutable t -> f.ty_fold_mutable (fold_ty f t)
 
   | Ast.TY_constrained (t, constrs) ->
@@ -778,7 +778,7 @@ let ty_fold_default (default:'a) : 'a simple_ty_fold =
       ty_fold_param = (fun _ -> default);
       ty_fold_named = (fun _ -> default);
       ty_fold_type = (fun _ -> default);
-      ty_fold_exterior = (fun _ -> default);
+      ty_fold_box = (fun _ -> default);
       ty_fold_mutable = (fun _ -> default);
       ty_fold_constrained = (fun _ -> default) }
 ;;
@@ -824,7 +824,7 @@ let ty_fold_rebuild (id:Ast.ty -> Ast.ty)
     ty_fold_param = (fun (i, mut) -> id (Ast.TY_param (i, mut)));
     ty_fold_named = (fun n -> id (Ast.TY_named n));
     ty_fold_type = (fun _ -> id (Ast.TY_type));
-    ty_fold_exterior = (fun t -> id (Ast.TY_exterior t));
+    ty_fold_box = (fun t -> id (Ast.TY_box t));
     ty_fold_mutable = (fun t -> id (Ast.TY_mutable t));
     ty_fold_constrained = (fun (t, constrs) ->
                              id (Ast.TY_constrained (t, constrs))) }
@@ -1069,7 +1069,7 @@ let check_concrete params thing =
 
 let rec simplified_ty (t:Ast.ty) : Ast.ty =
   match t with
-      Ast.TY_exterior t
+      Ast.TY_box t
     | Ast.TY_mutable t
     | Ast.TY_constrained (t, _) -> simplified_ty t
     | _ -> t
@@ -1097,12 +1097,12 @@ let rec project_type
     | (Ast.TY_obj (_, fns), Ast.COMP_named (Ast.COMP_ident id)) ->
         (Ast.TY_fn (Hashtbl.find fns id))
 
-    | (Ast.TY_exterior t, Ast.COMP_deref) -> t
+    | (Ast.TY_box t, Ast.COMP_deref) -> t
 
-    (* Exterior, mutable and constrained are transparent to the
+    (* Box, mutable and constrained are transparent to the
      * other lval-ext forms: x.y and x.(y).
      *)
-    | (Ast.TY_exterior t, _)
+    | (Ast.TY_box t, _)
     | (Ast.TY_mutable t, _)
     | (Ast.TY_constrained (t, _), _) -> project_type t comp
 
@@ -1315,7 +1315,7 @@ let ty_of_mod_item ((*inside*)_:bool) (item:Ast.mod_item) : Ast.ty =
         let tobj = Ast.TY_obj (ty_obj_of_obj ob) in
         let tsig = { Ast.sig_input_slots = arg_slots ob.Ast.obj_state;
                      Ast.sig_input_constrs = ob.Ast.obj_constrs;
-                     Ast.sig_output_slot = interior_slot tobj }
+                     Ast.sig_output_slot = local_slot tobj }
         in
           (Ast.TY_fn (tsig, taux))
 
@@ -1325,7 +1325,7 @@ let ty_of_mod_item ((*inside*)_:bool) (item:Ast.mod_item) : Ast.ty =
         in
         let tsig = { Ast.sig_input_slots = tup_slots htup;
                      Ast.sig_input_constrs = [| |];
-                     Ast.sig_output_slot = interior_slot (Ast.TY_tag ttag) }
+                     Ast.sig_output_slot = local_slot (Ast.TY_tag ttag) }
         in
           (Ast.TY_fn (tsig, taux))
 ;;
@@ -1867,7 +1867,7 @@ let rec referent_type (abi:Abi.abi) (t:Ast.ty) : Il.referent_ty =
 
       | Ast.TY_native _ -> ptr
 
-      | Ast.TY_exterior t ->
+      | Ast.TY_box t ->
           sp (Il.StructTy [| word; referent_type abi t |])
 
       | Ast.TY_mutable t -> referent_type abi t
@@ -1884,7 +1884,7 @@ and slot_referent_type (abi:Abi.abi) (sl:Ast.slot) : Il.referent_ty =
 
   let rty = referent_type abi (slot_ty sl) in
     match sl.Ast.slot_mode with
-      | Ast.MODE_interior _ -> rty
+      | Ast.MODE_local _ -> rty
       | Ast.MODE_alias _ -> sp rty
 ;;
 
@@ -2000,7 +2000,7 @@ let slot_sz (abi:Abi.abi) (s:Ast.slot) : int64 =
 ;;
 
 let word_slot (abi:Abi.abi) : Ast.slot =
-  interior_slot (Ast.TY_mach abi.Abi.abi_word_ty)
+  local_slot (Ast.TY_mach abi.Abi.abi_word_ty)
 ;;
 
 let alias_slot (ty:Ast.ty) : Ast.slot =
@@ -2045,7 +2045,7 @@ let mk_simple_ty_fn
     (arg_slots:Ast.slot array)
     : Ast.ty =
   (* In some cases we don't care what the output slot is. *)
-  let out_slot = interior_slot Ast.TY_nil in
+  let out_slot = local_slot Ast.TY_nil in
     mk_ty_fn out_slot arg_slots
 ;;
 
@@ -2053,7 +2053,7 @@ let mk_simple_ty_iter
     (arg_slots:Ast.slot array)
     : Ast.ty =
   (* In some cases we don't care what the output slot is. *)
-  let out_slot = interior_slot Ast.TY_nil in
+  let out_slot = local_slot Ast.TY_nil in
     mk_ty_fn_or_iter out_slot arg_slots true
 ;;
 
@@ -2073,7 +2073,7 @@ let ty_str (ty:Ast.ty) : string =
   let fold_slot (mode,ty) =
     (match mode with
          Ast.MODE_alias -> "a"
-       | Ast.MODE_interior -> "")
+       | Ast.MODE_local -> "")
     ^ ty
   in
   let num n = (string_of_int n) ^ "$" in
@@ -2147,7 +2147,7 @@ let ty_str (ty:Ast.ty) : string =
          ty_fold_param = (fun _ -> "P");
          ty_fold_type = (fun _ -> "Y");
          ty_fold_mutable = (fun t -> "m" ^ t);
-         ty_fold_exterior = (fun t -> "e" ^ t);
+         ty_fold_box = (fun t -> "e" ^ t);
 
          (* FIXME (issue #78): encode obj types. *)
          (* FIXME (issue #78): encode opaque and param numbers. *)
diff --git a/src/boot/me/trans.ml b/src/boot/me/trans.ml
index 9be58826..4b6eb19b 100644
--- a/src/boot/me/trans.ml
+++ b/src/boot/me/trans.ml
@@ -1584,17 +1584,16 @@ let trans_visitor
       : fixup =
     let g = GLUE_free ty in
     let inner _ (args:Il.cell) =
-      (* 
-       * Free-glue assumes it's called with a pointer to an 
-       * exterior allocation with normal exterior layout. It's
-       * just a way to move drop+free out of leaf code. 
+      (* Free-glue assumes it's called with a pointer to a box allocation with
+       * normal box layout. It's just a way to move drop+free out of leaf
+       * code.
        *)
       let ty_params = deref (get_element_ptr args 0) in
       let cell = get_element_ptr args 1 in
       let (body_mem, _) =
         need_mem_cell
           (get_element_ptr_dyn ty_params (deref cell)
-             Abi.exterior_rc_slot_field_body)
+             Abi.box_rc_slot_field_body)
       in
       let vr = next_vreg_cell Il.voidptr_t in
         lea vr body_mem;
@@ -1608,7 +1607,7 @@ let trans_visitor
           "free-glue complete";
     in
     let ty_params_ptr = ty_params_covering ty in
-    let fty = mk_simple_ty_fn [| ty_params_ptr; exterior_slot ty |] in
+    let fty = mk_simple_ty_fn [| ty_params_ptr; box_slot ty |] in
       get_typed_mem_glue g fty inner
 
 
@@ -1657,7 +1656,7 @@ let trans_visitor
     let ty_params_ptr = ty_params_covering ty in
     let fty =
       mk_ty_fn
-        (interior_slot ty)     (* dst *)
+        (local_slot ty)        (* dst *)
         [|
           ty_params_ptr;
           alias_slot ty;       (* src *)
@@ -1681,7 +1680,7 @@ let trans_visitor
     let ty_params_ptr = ty_params_covering ty in
     let fty =
       mk_ty_fn
-        (interior_slot ty)
+        (local_slot ty)
         [| ty_params_ptr; alias_slot ty |]
     in
       get_typed_mem_glue g fty inner
@@ -2120,7 +2119,7 @@ let trans_visitor
     trans_void_upcall "upcall_kill" [| Il.Cell task |]
 
   (*
-   * A vec is implicitly exterior: every slot vec[T] is 1 word and
+   * A vec is implicitly boxed: every slot vec[T] is 1 word and
    * points to a refcounted structure. That structure has 3 words with
    * defined meaning at the beginning; data follows the header.
    *
@@ -2212,22 +2211,22 @@ let trans_visitor
                                (ty_align abi ty))
              (tydesc_rty abi))
 
-  and exterior_ctrl_cell (cell:Il.cell) (off:int) : Il.cell =
+  and box_ctrl_cell (cell:Il.cell) (off:int) : Il.cell =
     let (mem, _) = need_mem_cell (deref_imm cell (word_n off)) in
       word_at mem
 
-  and exterior_rc_cell (cell:Il.cell) : Il.cell =
-    exterior_ctrl_cell cell Abi.exterior_rc_slot_field_refcnt
+  and box_rc_cell (cell:Il.cell) : Il.cell =
+    box_ctrl_cell cell Abi.box_rc_slot_field_refcnt
 
-  and exterior_allocation_size
+  and box_allocation_size
       (ty:Ast.ty)
       : Il.operand =
     let header_sz =
       match ty_mem_ctrl ty with
           MEM_gc
         | MEM_rc_opaque
-        | MEM_rc_struct -> word_n Abi.exterior_rc_header_size
-        | MEM_interior -> bug () "exterior_allocation_size of MEM_interior"
+        | MEM_rc_struct -> word_n Abi.box_rc_header_size
+        | MEM_interior -> bug () "box_allocation_size of MEM_interior"
     in
     let ty = simplified_ty ty in
     let refty_sz =
@@ -2304,8 +2303,8 @@ let trans_visitor
        * vreg and so has to be aware of when it's iterating over 2
        * sequences of cells or just 1.
        *)
-      check_exterior_rty src_cell;
-      check_exterior_rty dst_cell;
+      check_box_rty src_cell;
+      check_box_rty dst_cell;
       if dst_cell = src_cell
       then
         begin
@@ -2413,9 +2412,9 @@ let trans_visitor
               (* Drop non-null bindings. *)
               (* FIXME (issue #58): this is completely wrong, Closures need to
                * carry tydescs like objs. For now this only works by accident,
-               * and will leak closures with exterior substructure.
+               * and will leak closures with box substructure.
                *)
-              drop_ty ty_params binding (Ast.TY_exterior Ast.TY_int) curr_iso;
+              drop_ty ty_params binding (Ast.TY_box Ast.TY_int) curr_iso;
               patch null_jmp
 
         | Ast.TY_obj _ ->
@@ -2465,13 +2464,13 @@ let trans_visitor
             | MEM_rc_opaque
             | MEM_rc_struct ->
 
-                let _ = check_exterior_rty cell in
+                let _ = check_box_rty cell in
                 let null_jmp = null_check cell in
-                let rc = exterior_rc_cell cell in
+                let rc = box_rc_cell cell in
                 let j = drop_refcount_and_cmp rc in
 
-                  (* FIXME (issue #25): check to see that the exterior has
-                   * further exterior members; if it doesn't we can elide the
+                  (* FIXME (issue #25): check to see that the box has
+                   * further box members; if it doesn't we can elide the
                    * call to the glue function.  *)
 
                   if mctrl = MEM_rc_opaque
@@ -2491,7 +2490,7 @@ let trans_visitor
 
             | MEM_interior when type_is_structured ty ->
                 (iflog (fun _ ->
-                          annotate ("drop interior slot " ^
+                          annotate ("drop interior memory " ^
                                       (Fmt.fmt_to_str Ast.fmt_ty ty))));
                 let (mem, _) = need_mem_cell cell in
                 let vr = next_vreg_cell Il.voidptr_t in
@@ -2516,9 +2515,9 @@ let trans_visitor
       match ty_mem_ctrl ty with
           MEM_gc ->
 
-            let _ = check_exterior_rty cell in
+            let _ = check_box_rty cell in
             let null_jmp = null_check cell in
-            let rc = exterior_rc_cell cell in
+            let rc = box_rc_cell cell in
             let _ = note_gc_step ty "severing GC slot" in
               emit (Il.binary Il.SUB rc (Il.Cell rc) one);
               mov cell zero;
@@ -2551,7 +2550,7 @@ let trans_visitor
           -> mov dst (Il.Cell src)
       | Ast.TY_fn _
       | Ast.TY_obj _ -> ()
-      | Ast.TY_exterior ty ->
+      | Ast.TY_box ty ->
           let glue_fix = get_clone_glue ty curr_iso in
             trans_call_static_glue
               (code_fixup_to_ptr_operand glue_fix)
@@ -2615,8 +2614,8 @@ let trans_visitor
                  * this only works by accident.
                  *)
                 trans_copy_ty ty_params true
-                  dst_binding (Ast.TY_exterior Ast.TY_int)
-                  src_binding (Ast.TY_exterior Ast.TY_int)
+                  dst_binding (Ast.TY_box Ast.TY_int)
+                  src_binding (Ast.TY_box Ast.TY_int)
                   curr_iso;
                 patch null_jmp
           end
@@ -2652,7 +2651,7 @@ let trans_visitor
       : Ast.ty =
     match (curr_iso, t) with
         (Some iso, Ast.TY_idx n) ->
-          Ast.TY_exterior (Ast.TY_iso { iso with Ast.iso_index = n })
+          Ast.TY_box (Ast.TY_iso { iso with Ast.iso_index = n })
       | (None, Ast.TY_idx _) ->
           bug () "TY_idx outside TY_iso"
       | _ -> t
@@ -2687,11 +2686,11 @@ let trans_visitor
             let marked_jump =
               trans_compare Il.JE (Il.Cell tmp) zero;
             in
-              (* Iterate over exterior parts marking outgoing links. *)
+              (* Iterate over box parts marking outgoing links. *)
             let (body_mem, _) =
               need_mem_cell
                 (get_element_ptr (deref cell)
-                   Abi.exterior_gc_slot_field_body)
+                   Abi.box_gc_slot_field_body)
             in
             let ty = maybe_iso curr_iso ty in
             let curr_iso = maybe_enter_iso ty curr_iso in
@@ -2703,7 +2702,7 @@ let trans_visitor
 
         | MEM_interior when type_is_structured ty ->
             (iflog (fun _ ->
-                      annotate ("mark interior slot " ^
+                      annotate ("mark interior memory " ^
                                   (Fmt.fmt_to_str Ast.fmt_ty ty))));
             let (mem, _) = need_mem_cell cell in
             let tmp = next_vreg_cell Il.voidptr_t in
@@ -2716,13 +2715,13 @@ let trans_visitor
 
         | _ -> ()
 
-  and check_exterior_rty cell =
+  and check_box_rty cell =
     match cell with
         Il.Reg (_, Il.AddrTy (Il.StructTy fields))
       | Il.Mem (_, Il.ScalarTy (Il.AddrTy (Il.StructTy fields)))
           when (((Array.length fields) > 0) && (fields.(0) = word_rty)) -> ()
       | _ -> bug ()
-          "expected plausibly-exterior cell, got %s"
+          "expected plausibly-box cell, got %s"
             (Il.string_of_referent_ty (Il.cell_referent_ty cell))
 
   and drop_slot_in_current_frame
@@ -2755,7 +2754,7 @@ let trans_visitor
     match slot.Ast.slot_mode with
         Ast.MODE_alias
           (* Aliases are always free to drop. *)
-      | Ast.MODE_interior ->
+      | Ast.MODE_local ->
           drop_ty ty_params cell (slot_ty slot) curr_iso
 
   and note_drop_step ty step =
@@ -2788,7 +2787,7 @@ let trans_visitor
         end
 
   (* Returns the offset of the slot-body in the initialized allocation. *)
-  and init_exterior (cell:Il.cell) (ty:Ast.ty) : unit =
+  and init_box (cell:Il.cell) (ty:Ast.ty) : unit =
     let mctrl = ty_mem_ctrl ty in
       match mctrl with
           MEM_gc
@@ -2799,14 +2798,14 @@ let trans_visitor
               then Il.Cell (get_tydesc None ty)
               else zero
             in
-              iflog (fun _ -> annotate "init exterior: malloc");
-              let sz = exterior_allocation_size ty in
+              iflog (fun _ -> annotate "init box: malloc");
+              let sz = box_allocation_size ty in
                 trans_malloc cell sz ctrl;
-                iflog (fun _ -> annotate "init exterior: load refcount");
-                let rc = exterior_rc_cell cell in
+                iflog (fun _ -> annotate "init box: load refcount");
+                let rc = box_rc_cell cell in
                   mov rc one
 
-      | MEM_interior -> bug () "init_exterior of MEM_interior"
+      | MEM_interior -> bug () "init_box of MEM_interior"
 
   and deref_ty
       (initializing:bool)
@@ -2819,14 +2818,14 @@ let trans_visitor
       | Ast.TY_constrained (ty, _) ->
           deref_ty initializing cell ty
 
-      | Ast.TY_exterior ty' ->
-          check_exterior_rty cell;
+      | Ast.TY_box ty' ->
+          check_box_rty cell;
           if initializing
-          then init_exterior cell ty;
+          then init_box cell ty;
           let cell =
             get_element_ptr_dyn_in_current_frame
               (deref cell)
-              (Abi.exterior_rc_slot_field_body)
+              (Abi.box_rc_slot_field_body)
           in
             (* Init recursively so @@@@T chain works. *)
             deref_ty initializing cell ty'
@@ -2840,7 +2839,7 @@ let trans_visitor
       (slot:Ast.slot)
       : Il.cell =
     match slot.Ast.slot_mode with
-        Ast.MODE_interior ->
+        Ast.MODE_local ->
           cell
 
       | Ast.MODE_alias _  ->
@@ -2892,7 +2891,7 @@ let trans_visitor
         | (MEM_rc_struct, MEM_rc_struct) ->
             (* Lightweight copy: twiddle refcounts, move pointer. *)
             anno "refcounted light";
-            add_to (exterior_rc_cell src) one;
+            add_to (box_rc_cell src) one;
             if not initializing
             then
               drop_ty ty_params dst dst_ty None;
@@ -2961,7 +2960,7 @@ let trans_visitor
       match t with
           Ast.TY_vec _
         | Ast.TY_str -> true
-        | Ast.TY_exterior t when can_append t -> true
+        | Ast.TY_box t when can_append t -> true
         | _ -> false
     in
       match (dst_ty, src) with
@@ -3129,7 +3128,7 @@ let trans_visitor
         (Ast.MODE_alias, CLONE_none) ->
           mov dst (Il.Cell (alias (Il.Mem (need_mem_cell src))))
 
-      | (Ast.MODE_interior, CLONE_none) ->
+      | (Ast.MODE_local, CLONE_none) ->
           trans_copy_ty
             ty_params true
             dst dst_ty src src_ty None
@@ -4402,9 +4401,9 @@ let trans_visitor
     in
     let obj_args_ty = Ast.TY_tup obj_args_tup in
     let state_ty = Ast.TY_tup [| Ast.TY_type; obj_args_ty |] in
-    let state_ptr_ty = Ast.TY_exterior state_ty in
+    let state_ptr_ty = Ast.TY_box state_ty in
     let state_ptr_rty = referent_type abi state_ptr_ty in
-    let state_malloc_sz = exterior_allocation_size state_ptr_ty in
+    let state_malloc_sz = box_allocation_size state_ptr_ty in
 
     let ctor_ty = Hashtbl.find cx.ctxt_all_item_types obj_id in
     let obj_ty =
@@ -4684,8 +4683,8 @@ let trans_visitor
       else ignore (Stack.pop curr_file)
   in
 
-  let visit_local_mod_item_pre n _ i =
-    iflog (fun _ -> log cx "translating local item #%d = %s"
+  let visit_defined_mod_item_pre n _ i =
+    iflog (fun _ -> log cx "translating defined item #%d = %s"
              (int_of_node i.id) (path_name()));
     match i.node.Ast.decl_item with
         Ast.MOD_ITEM_fn f -> trans_fn i.id f.Ast.fn_body
@@ -4730,7 +4729,7 @@ let trans_visitor
       inner.Walk.visit_obj_drop_pre obj b
   in
 
-  let visit_local_obj_fn_pre _ _ fn =
+  let visit_defined_obj_fn_pre _ _ fn =
     trans_fn fn.id fn.node.Ast.fn_body
   in
 
@@ -4745,7 +4744,7 @@ let trans_visitor
       then
         visit_required_obj_fn_pre obj ident fn
       else
-        visit_local_obj_fn_pre obj ident fn;
+        visit_defined_obj_fn_pre obj ident fn;
     end;
     inner.Walk.visit_obj_fn_pre obj ident fn
   in
@@ -4757,7 +4756,7 @@ let trans_visitor
       then
         visit_required_mod_item_pre n p i
       else
-        visit_local_mod_item_pre n p i
+        visit_defined_mod_item_pre n p i
     end;
     inner.Walk.visit_mod_item_pre n p i
   in
diff --git a/src/boot/me/transutil.ml b/src/boot/me/transutil.ml
index 8c6b8bc3..d7fbb566 100644
--- a/src/boot/me/transutil.ml
+++ b/src/boot/me/transutil.ml
@@ -7,7 +7,7 @@ open Semant;;
  * "simple" precise, mark-sweep, single-generation, per-task (thereby
  * preemptable and relatively quick) GC scheme on mutable memory.
  * 
- * - For the sake of this note, call any exterior of 'state' effect a gc_val.
+ * - For the sake of this note, call any box of 'state' effect a gc_val.
  *
  * - gc_vals come from the same malloc as all other values but undergo
  *   different storage management.
@@ -19,7 +19,7 @@ open Semant;;
  *
  *  - A pointer to a gc_val, however, points to the third of these three
  *    words. So a certain quantity of code can treat gc_vals the same way it
- *    would treat refcounted exterior vals.
+ *    would treat refcounted box vals.
  *
  *  - The first word at the head of a gc_val is used as a refcount, as in
  *    non-gc allocations.
@@ -122,7 +122,7 @@ let rec ty_mem_ctrl (ty:Ast.ty) : mem_ctrl =
         if type_has_state ty
         then MEM_gc
         else MEM_rc_opaque
-    | Ast.TY_exterior t ->
+    | Ast.TY_box t ->
         if type_has_state t
         then MEM_gc
         else
@@ -139,7 +139,7 @@ let rec ty_mem_ctrl (ty:Ast.ty) : mem_ctrl =
 let slot_mem_ctrl (slot:Ast.slot) : mem_ctrl =
   match slot.Ast.slot_mode with
       Ast.MODE_alias -> MEM_interior
-    | Ast.MODE_interior ->
+    | Ast.MODE_local ->
         ty_mem_ctrl (slot_ty slot)
 ;;
 
diff --git a/src/boot/me/type.ml b/src/boot/me/type.ml
index edd750f5..36f5d3a3 100644
--- a/src/boot/me/type.ml
+++ b/src/boot/me/type.ml
@@ -5,7 +5,7 @@ type tyspec =
     TYSPEC_equiv of tyvar
   | TYSPEC_all
   | TYSPEC_resolved of (Ast.ty_param array) * Ast.ty
-  | TYSPEC_exterior of tyvar                  (* @ of some t *)
+  | TYSPEC_box of tyvar                       (* @ of some t *)
   | TYSPEC_mutable of tyvar                   (* something mutable *)
   | TYSPEC_callable of (tyvar * tyvar array)  (* out, ins *)
   | TYSPEC_collection of tyvar                (* vec or str *)
@@ -107,7 +107,7 @@ let rec tyspec_to_str (ts:tyspec) : string =
       | TYSPEC_equiv tv ->
           fmt_tyspec ff (!tv)
 
-      | TYSPEC_exterior tv ->
+      | TYSPEC_box tv ->
           fmt ff "@@";
           fmt_tyspec ff (!tv)
 
@@ -173,31 +173,31 @@ let rec resolve_tyvar (tv:tyvar) : tyvar =
 
 type unify_ctxt =
     { mut_ok: bool;
-      ext_ok: bool }
+      box_ok: bool }
 ;;
 
 let arg_pass_ctx =
-  { ext_ok = false;
+  { box_ok = false;
     mut_ok = true }
 ;;
 
 let rval_ctx =
-  { ext_ok = true;
+  { box_ok = true;
     mut_ok = true }
 ;;
 
 let lval_ctx =
-  { ext_ok = false;
+  { box_ok = false;
     mut_ok = true }
 ;;
 
 let init_ctx =
-  { ext_ok = true;
+  { box_ok = true;
     mut_ok = true }
 ;;
 
 let strict_ctx =
-  { ext_ok = false;
+  { box_ok = false;
     mut_ok = false }
 ;;
 
@@ -265,12 +265,12 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
         iflog cx
           (fun _ ->
              log cx "%s> unifying types:" indent;
-             if ucx.ext_ok || ucx.mut_ok
+             if ucx.box_ok || ucx.mut_ok
              then
                log cx "%s> (w/ %s%s%s)"
                  indent
-                 (if ucx.ext_ok then "ext-ok" else "")
-                 (if ucx.ext_ok && ucx.mut_ok then " " else "")
+                 (if ucx.box_ok then "ext-ok" else "")
+                 (if ucx.box_ok && ucx.mut_ok then " " else "")
                  (if ucx.mut_ok then "mut-ok" else "");
              log cx "%s> input tyvar A:     %s" indent (tyspec_to_str !av);
              log cx "%s> input tyvar B:     %s" indent (tyspec_to_str !bv));
@@ -341,8 +341,8 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
           : Ast.ty =
         match ty_a, ty_b with
             a, b when a = b -> a
-          | Ast.TY_exterior a, b | b, Ast.TY_exterior a when ucx.ext_ok ->
-              Ast.TY_exterior (unify_resolved_types a b)
+          | Ast.TY_box a, b | b, Ast.TY_box a when ucx.box_ok ->
+              Ast.TY_box (unify_resolved_types a b)
           | Ast.TY_mutable a, b | b, Ast.TY_mutable a when ucx.mut_ok ->
               Ast.TY_mutable (unify_resolved_types a b)
           | Ast.TY_constrained (a, constrs), b
@@ -366,15 +366,15 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
               is_comparable_or_ordered comparable ty
           | Ast.TY_mutable ty ->
               ucx.mut_ok && is_comparable_or_ordered comparable ty
-          | Ast.TY_exterior ty ->
-              ucx.ext_ok && is_comparable_or_ordered comparable ty
+          | Ast.TY_box ty ->
+              ucx.box_ok && is_comparable_or_ordered comparable ty
       in
 
       let rec floating (ty:Ast.ty) : bool =
         match ty with
             Ast.TY_mach TY_f32 | Ast.TY_mach TY_f64 -> true
           | Ast.TY_mutable ty when ucx.mut_ok -> floating ty
-          | Ast.TY_exterior ty when ucx.ext_ok -> floating ty
+          | Ast.TY_box ty when ucx.box_ok -> floating ty
           | _ -> false
       in
 
@@ -386,7 +386,7 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
           | Ast.TY_mach TY_i64 ->
               true
           | Ast.TY_mutable ty when ucx.mut_ok -> integral ty
-          | Ast.TY_exterior ty when ucx.ext_ok -> integral ty
+          | Ast.TY_box ty when ucx.box_ok -> integral ty
           | _ -> false
       in
 
@@ -397,7 +397,7 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
             Ast.TY_str -> true
           | Ast.TY_vec _ -> true
           | Ast.TY_mutable ty when ucx.mut_ok -> plusable ty
-          | Ast.TY_exterior ty when ucx.ext_ok -> plusable ty
+          | Ast.TY_box ty when ucx.box_ok -> plusable ty
           | _ -> numeric ty
       in
 
@@ -408,7 +408,7 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
           | Ast.TY_mach TY_i8 | Ast.TY_mach TY_i16 | Ast.TY_mach TY_i32
               -> true
           | Ast.TY_mutable ty when ucx.mut_ok -> loggable ty
-          | Ast.TY_exterior ty when ucx.ext_ok -> loggable ty
+          | Ast.TY_box ty when ucx.box_ok -> loggable ty
           | _ -> false
       in
 
@@ -419,34 +419,34 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
 
           | (TYSPEC_all, other) | (other, TYSPEC_all) -> other
 
-          (* exterior *)
+          (* box *)
 
-          | (TYSPEC_exterior a', TYSPEC_exterior b') ->
+          | (TYSPEC_box a', TYSPEC_box b') ->
               unify_tyvars ucx a' b'; !a
 
-          | (TYSPEC_exterior a',
-             TYSPEC_resolved (_, Ast.TY_exterior _)) ->
+          | (TYSPEC_box a',
+             TYSPEC_resolved (_, Ast.TY_box _)) ->
                unify_tyvars ucx a' b; !b
 
-          | (TYSPEC_resolved (_, Ast.TY_exterior _),
-             TYSPEC_exterior b') ->
+          | (TYSPEC_resolved (_, Ast.TY_box _),
+             TYSPEC_box b') ->
                unify_tyvars ucx a b'; !a
 
-          | (_, TYSPEC_resolved (params, Ast.TY_exterior ty))
-              when ucx.ext_ok ->
+          | (_, TYSPEC_resolved (params, Ast.TY_box ty))
+              when ucx.box_ok ->
               unify_ty_parametric ucx ty params a; !b
 
-          | (TYSPEC_resolved (params, Ast.TY_exterior ty), _)
-              when ucx.ext_ok ->
+          | (TYSPEC_resolved (params, Ast.TY_box ty), _)
+              when ucx.box_ok ->
               unify_ty_parametric ucx ty params b; !a
 
-          | (TYSPEC_exterior a', _) when ucx.ext_ok
+          | (TYSPEC_box a', _) when ucx.box_ok
               -> unify_tyvars ucx a' b; !a
-          | (_, TYSPEC_exterior b') when ucx.ext_ok
+          | (_, TYSPEC_box b') when ucx.box_ok
               -> unify_tyvars ucx a b'; !b
 
-          | (_, TYSPEC_exterior _)
-          | (TYSPEC_exterior _, _) -> fail()
+          | (_, TYSPEC_box _)
+          | (TYSPEC_box _, _) -> fail()
 
           (* mutable *)
 
@@ -505,8 +505,8 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
                           unify_slot arg_pass_ctx out_slot None out_tv;
                           Array.iteri unify_in_slot in_slots;
                           ty
-                    | Ast.TY_exterior ty when ucx.ext_ok
-                        -> Ast.TY_exterior (unify ty)
+                    | Ast.TY_box ty when ucx.box_ok
+                        -> Ast.TY_box (unify ty)
                     | Ast.TY_mutable ty when ucx.mut_ok
                         -> Ast.TY_mutable (unify ty)
                     | _ -> fail ()
@@ -520,8 +520,8 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
                     Ast.TY_vec ty' -> unify_ty ucx ty' tv; ty
                   | Ast.TY_str ->
                       unify_ty ucx (Ast.TY_mach TY_u8) tv; ty
-                  | Ast.TY_exterior ty
-                      when ucx.ext_ok -> Ast.TY_exterior (unify ty)
+                  | Ast.TY_box ty
+                      when ucx.box_ok -> Ast.TY_box (unify ty)
                   | Ast.TY_mutable ty
                       when ucx.mut_ok -> Ast.TY_mutable (unify ty)
                   | _ -> fail ()
@@ -548,8 +548,8 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
                   | Ast.TY_obj (_, fns) ->
                       unify_dict_with_obj_fns dct fns;
                       ty
-                  | Ast.TY_exterior ty
-                      when ucx.ext_ok -> Ast.TY_exterior (unify ty)
+                  | Ast.TY_box ty
+                      when ucx.box_ok -> Ast.TY_box (unify ty)
                   | Ast.TY_mutable ty
                       when ucx.mut_ok -> Ast.TY_mutable (unify ty)
                   | _ -> fail ()
@@ -591,8 +591,8 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
                     Ast.TY_rec fields ->
                       unify_dict_with_record_fields dct fields;
                       ty
-                  | Ast.TY_exterior ty
-                      when ucx.ext_ok -> Ast.TY_exterior (unify ty)
+                  | Ast.TY_box ty
+                      when ucx.box_ok -> Ast.TY_box (unify ty)
                   | Ast.TY_mutable ty
                       when ucx.mut_ok -> Ast.TY_mutable (unify ty)
                   | _ -> fail ()
@@ -612,10 +612,10 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
                         in
                           Array.iteri check_elem tvs;
                           ty
-                  | Ast.TY_exterior ty
-                      when ucx.ext_ok -> Ast.TY_exterior (unify ty)
+                  | Ast.TY_box ty
+                      when ucx.box_ok -> Ast.TY_box (unify ty)
                   | Ast.TY_mutable ty
-                      when ucx.ext_ok -> Ast.TY_mutable (unify ty)
+                      when ucx.box_ok -> Ast.TY_mutable (unify ty)
                   | _ -> fail ()
               in
               TYSPEC_resolved (params, unify ty)
@@ -625,8 +625,8 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
               let rec unify ty =
                 match ty with
                     Ast.TY_vec ty' -> unify_ty ucx ty' tv; ty
-                  | Ast.TY_exterior ty when ucx.ext_ok ->
-                      Ast.TY_exterior (unify ty)
+                  | Ast.TY_box ty when ucx.box_ok ->
+                      Ast.TY_box (unify ty)
                   | Ast.TY_mutable ty when ucx.mut_ok ->
                       Ast.TY_mutable (unify ty)
                   | _ -> fail ()
@@ -1113,10 +1113,10 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
                     TYSPEC_collection tv
 
                 | Ast.COMP_deref ->
-                    TYSPEC_exterior tv
+                    TYSPEC_box tv
               in
               let base_tv = ref base_ts in
-                unify_lval' { ucx with ext_ok = true } base base_tv;
+                unify_lval' { ucx with box_ok = true } base base_tv;
                 match !(resolve_tyvar base_tv) with
                     TYSPEC_resolved (_, ty) ->
                       unify_ty ucx (project_type ty comp) tv
@@ -1367,7 +1367,7 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
                     Ast.TY_fn (tsig, _) ->
                       begin
                         let vec_str =
-                          interior_slot (Ast.TY_vec Ast.TY_str)
+                          local_slot (Ast.TY_vec Ast.TY_str)
                         in
                           match tsig.Ast.sig_input_slots with
                               [| |] -> ()
@@ -1532,8 +1532,8 @@ let process_crate (cx:ctxt) (crate:Ast.crate) : unit =
           let ts = !(resolve_tyvar tv) in
             match ts with
                 TYSPEC_resolved ([||], ty) -> ty
-              | TYSPEC_exterior tv ->
-                  Ast.TY_exterior (get_resolved_ty tv id)
+              | TYSPEC_box tv ->
+                  Ast.TY_box (get_resolved_ty tv id)
 
               | TYSPEC_mutable tv ->
                   Ast.TY_mutable (get_resolved_ty tv id)
diff --git a/src/boot/me/walk.ml b/src/boot/me/walk.ml
index 64c08724..af4a6216 100644
--- a/src/boot/me/walk.ml
+++ b/src/boot/me/walk.ml
@@ -301,7 +301,7 @@ and walk_ty
       | Ast.TY_nil -> ()
       | Ast.TY_task -> ()
       | Ast.TY_any -> ()
-      | Ast.TY_exterior m -> walk_ty v m
+      | Ast.TY_box m -> walk_ty v m
       | Ast.TY_mutable m -> walk_ty v m
   in
     walk_bracketed
@@ -471,7 +471,7 @@ and walk_stmt
           walk_option (walk_lval v) port;
           walk_lval v chan;
 
-      | Ast.STMT_init_exterior (dst, src) ->
+      | Ast.STMT_init_box (dst, src) ->
           walk_lval v dst;
           walk_atom v src
 
diff --git a/src/test/run-pass/acyclic-unwind.rs b/src/test/run-pass/acyclic-unwind.rs
index b549cffe..192a01f3 100644
--- a/src/test/run-pass/acyclic-unwind.rs
+++ b/src/test/run-pass/acyclic-unwind.rs
@@ -4,10 +4,10 @@ io fn f(chan[int] c)
 {
   type t = tup(int,int,int);
 
-  // Allocate an exterior.
+  // Allocate a box.
   let @t x = tup(1,2,3);
 
-  // Signal parent that we've allocated an exterior.
+  // Signal parent that we've allocated a box.
   c <| 1;
 
   while (true) {
diff --git a/src/test/run-pass/obj-drop.rs b/src/test/run-pass/obj-drop.rs
index 6d4ca3d4..ab068b9b 100644
--- a/src/test/run-pass/obj-drop.rs
+++ b/src/test/run-pass/obj-drop.rs
@@ -1,6 +1,6 @@
 fn main() {
   obj handle(@int i) {
   }
-  // This just tests whether the obj leaks its exterior state members.
+  // This just tests whether the obj leaks its box state members.
   auto ob = handle(0xf00f00);
 }
\ No newline at end of file