diff --git a/src/librustc/ast_map/mod.rs b/src/librustc/ast_map/mod.rs
index a193ffcc731..b38c15d0f6a 100644
--- a/src/librustc/ast_map/mod.rs
+++ b/src/librustc/ast_map/mod.rs
@@ -12,6 +12,8 @@ pub use self::Node::*;
 pub use self::PathElem::*;
 use self::MapEntry::*;
 
+use metadata::inline::InlinedItem;
+use metadata::inline::InlinedItem as II;
 use syntax::abi;
 use syntax::ast::*;
 use syntax::ast_util;
@@ -374,8 +376,8 @@ impl<'ast> Map<'ast> {
     pub fn get_parent_did(&self, id: NodeId) -> DefId {
         let parent = self.get_parent(id);
         match self.find_entry(parent) {
-            Some(RootInlinedParent(&InlinedParent {ii: IITraitItem(did, _), ..})) => did,
-            Some(RootInlinedParent(&InlinedParent {ii: IIImplItem(did, _), ..})) => did,
+            Some(RootInlinedParent(&InlinedParent {ii: II::TraitItem(did, _), ..})) => did,
+            Some(RootInlinedParent(&InlinedParent {ii: II::ImplItem(did, _), ..})) => did,
             _ => ast_util::local_def(parent)
         }
     }
@@ -967,16 +969,16 @@ pub fn map_decoded_item<'ast, F: FoldOps>(map: &Map<'ast>,
                                           -> &'ast InlinedItem {
     let mut fld = IdAndSpanUpdater { fold_ops: fold_ops };
     let ii = match ii {
-        IIItem(i) => IIItem(fld.fold_item(i).expect_one("expected one item")),
-        IITraitItem(d, ti) => {
-            IITraitItem(fld.fold_ops.new_def_id(d),
-                        fld.fold_trait_item(ti).expect_one("expected one trait item"))
+        II::Item(i) => II::Item(fld.fold_item(i).expect_one("expected one item")),
+        II::TraitItem(d, ti) => {
+            II::TraitItem(fld.fold_ops.new_def_id(d),
+                          fld.fold_trait_item(ti).expect_one("expected one trait item"))
         }
-        IIImplItem(d, ii) => {
-            IIImplItem(fld.fold_ops.new_def_id(d),
-                       fld.fold_impl_item(ii).expect_one("expected one impl item"))
+        II::ImplItem(d, ii) => {
+            II::ImplItem(fld.fold_ops.new_def_id(d),
+                         fld.fold_impl_item(ii).expect_one("expected one impl item"))
         }
-        IIForeign(i) => IIForeign(fld.fold_foreign_item(i))
+        II::Foreign(i) => II::Foreign(fld.fold_foreign_item(i))
     };
 
     let ii_parent = map.forest.inlined_items.alloc(InlinedParent {
@@ -990,20 +992,20 @@ pub fn map_decoded_item<'ast, F: FoldOps>(map: &Map<'ast>,
         parent_node: ii_parent_id,
     };
     collector.insert_entry(ii_parent_id, RootInlinedParent(ii_parent));
-    visit::walk_inlined_item(&mut collector, &ii_parent.ii);
+    ii_parent.ii.visit(&mut collector);
 
     // Methods get added to the AST map when their impl is visited.  Since we
     // don't decode and instantiate the impl, but just the method, we have to
     // add it to the table now. Likewise with foreign items.
     match ii_parent.ii {
-        IIItem(_) => {}
-        IITraitItem(_, ref ti) => {
+        II::Item(_) => {}
+        II::TraitItem(_, ref ti) => {
             collector.insert(ti.id, NodeTraitItem(ti));
         }
-        IIImplItem(_, ref ii) => {
+        II::ImplItem(_, ref ii) => {
             collector.insert(ii.id, NodeImplItem(ii));
         }
-        IIForeign(ref i) => {
+        II::Foreign(ref i) => {
             collector.insert(i.id, NodeForeignItem(i));
         }
     }
diff --git a/src/librustc/metadata/csearch.rs b/src/librustc/metadata/csearch.rs
index 2ade251018f..d33b163c972 100644
--- a/src/librustc/metadata/csearch.rs
+++ b/src/librustc/metadata/csearch.rs
@@ -14,6 +14,7 @@ use ast_map;
 use metadata::common::*;
 use metadata::cstore;
 use metadata::decoder;
+use metadata::inline::InlinedItem;
 use middle::lang_items;
 use middle::ty;
 
@@ -96,8 +97,8 @@ pub fn get_item_path(tcx: &ty::ctxt, def: ast::DefId) -> Vec<ast_map::PathElem>
 }
 
 pub enum FoundAst<'ast> {
-    Found(&'ast ast::InlinedItem),
-    FoundParent(ast::DefId, &'ast ast::InlinedItem),
+    Found(&'ast InlinedItem),
+    FoundParent(ast::DefId, &'ast InlinedItem),
     NotFound,
 }
 
diff --git a/src/librustc/metadata/decoder.rs b/src/librustc/metadata/decoder.rs
index c6c18fa14a3..11a5cc8c9d7 100644
--- a/src/librustc/metadata/decoder.rs
+++ b/src/librustc/metadata/decoder.rs
@@ -23,6 +23,7 @@ use metadata::csearch::MethodInfo;
 use metadata::csearch;
 use metadata::cstore;
 use metadata::encoder::def_to_u64;
+use metadata::inline::InlinedItem;
 use metadata::tydecode::{parse_ty_data, parse_region_data,
                          parse_type_param_def_data, parse_bare_fn_ty_data,
                          parse_trait_ref_data, parse_predicate_data};
@@ -776,7 +777,7 @@ pub type DecodeInlinedItem<'a> =
                         &ty::ctxt<'tcx>,
                         Vec<ast_map::PathElem>,
                         rbml::Doc)
-                        -> Result<&'tcx ast::InlinedItem, Vec<ast_map::PathElem>> + 'a>;
+                        -> Result<&'tcx InlinedItem, Vec<ast_map::PathElem>> + 'a>;
 
 pub fn maybe_get_item_ast<'tcx>(cdata: Cmd, tcx: &ty::ctxt<'tcx>, id: ast::NodeId,
                                 mut decode_inlined_item: DecodeInlinedItem)
diff --git a/src/librustc/metadata/encoder.rs b/src/librustc/metadata/encoder.rs
index e0f35b6817b..03f5f477bd8 100644
--- a/src/librustc/metadata/encoder.rs
+++ b/src/librustc/metadata/encoder.rs
@@ -13,8 +13,6 @@
 #![allow(unused_must_use)] // everything is just a MemWriter, can't fail
 #![allow(non_camel_case_types)]
 
-pub use self::InlinedItemRef::*;
-
 use ast_map::{self, LinkedPath, PathElem, PathElems};
 use back::svh::Svh;
 use session::config;
@@ -22,6 +20,7 @@ use metadata::common::*;
 use metadata::cstore;
 use metadata::decoder;
 use metadata::tyencode;
+use metadata::inline::InlinedItemRef;
 use middle::def;
 use middle::ty::{self, Ty};
 use middle::stability;
@@ -46,14 +45,6 @@ use syntax::visit;
 use syntax;
 use rbml::writer::Encoder;
 
-/// A borrowed version of `ast::InlinedItem`.
-pub enum InlinedItemRef<'a> {
-    IIItemRef(&'a ast::Item),
-    IITraitItemRef(DefId, &'a ast::TraitItem),
-    IIImplItemRef(DefId, &'a ast::ImplItem),
-    IIForeignRef(&'a ast::ForeignItem)
-}
-
 pub type EncodeInlinedItem<'a> =
     Box<FnMut(&EncodeContext, &mut Encoder, InlinedItemRef) + 'a>;
 
@@ -830,7 +821,7 @@ fn encode_info_for_associated_const(ecx: &EncodeContext,
 
     if let Some(ii) = impl_item_opt {
         encode_attributes(rbml_w, &ii.attrs);
-        encode_inlined_item(ecx, rbml_w, IIImplItemRef(local_def(parent_id), ii));
+        encode_inlined_item(ecx, rbml_w, InlinedItemRef::ImplItem(local_def(parent_id), ii));
     }
 
     rbml_w.end_tag();
@@ -868,7 +859,7 @@ fn encode_info_for_method<'a, 'tcx>(ecx: &EncodeContext<'a, 'tcx>,
             let needs_inline = any_types || is_default_impl ||
                                attr::requests_inline(&impl_item.attrs);
             if needs_inline || sig.constness == ast::Constness::Const {
-                encode_inlined_item(ecx, rbml_w, IIImplItemRef(local_def(parent_id),
+                encode_inlined_item(ecx, rbml_w, InlinedItemRef::ImplItem(local_def(parent_id),
                                                                impl_item));
             }
             encode_constness(rbml_w, sig.constness);
@@ -1050,7 +1041,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
         encode_name(rbml_w, item.ident.name);
         encode_path(rbml_w, path);
         encode_attributes(rbml_w, &item.attrs);
-        encode_inlined_item(ecx, rbml_w, IIItemRef(item));
+        encode_inlined_item(ecx, rbml_w, InlinedItemRef::Item(item));
         encode_visibility(rbml_w, vis);
         encode_stability(rbml_w, stab);
         rbml_w.end_tag();
@@ -1067,7 +1058,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
         encode_attributes(rbml_w, &item.attrs);
         let needs_inline = tps_len > 0 || attr::requests_inline(&item.attrs);
         if needs_inline || constness == ast::Constness::Const {
-            encode_inlined_item(ecx, rbml_w, IIItemRef(item));
+            encode_inlined_item(ecx, rbml_w, InlinedItemRef::Item(item));
         }
         if tps_len == 0 {
             encode_symbol(ecx, rbml_w, item.id);
@@ -1132,7 +1123,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
         for v in &enum_definition.variants {
             encode_variant_id(rbml_w, local_def(v.node.id));
         }
-        encode_inlined_item(ecx, rbml_w, IIItemRef(item));
+        encode_inlined_item(ecx, rbml_w, InlinedItemRef::Item(item));
         encode_path(rbml_w, path);
 
         // Encode inherent implementations for this enumeration.
@@ -1180,7 +1171,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
         needs to know*/
         encode_struct_fields(rbml_w, variant, def_id);
 
-        encode_inlined_item(ecx, rbml_w, IIItemRef(item));
+        encode_inlined_item(ecx, rbml_w, InlinedItemRef::Item(item));
 
         // Encode inherent implementations for this structure.
         encode_inherent_implementations(ecx, rbml_w, def_id);
@@ -1455,7 +1446,7 @@ fn encode_info_for_item(ecx: &EncodeContext,
             match trait_item.node {
                 ast::ConstTraitItem(_, _) => {
                     encode_inlined_item(ecx, rbml_w,
-                                        IITraitItemRef(def_id, trait_item));
+                                        InlinedItemRef::TraitItem(def_id, trait_item));
                 }
                 ast::MethodTraitItem(ref sig, ref body) => {
                     // If this is a static method, we've already
@@ -1469,7 +1460,8 @@ fn encode_info_for_item(ecx: &EncodeContext,
 
                     if body.is_some() {
                         encode_item_sort(rbml_w, 'p');
-                        encode_inlined_item(ecx, rbml_w, IITraitItemRef(def_id, trait_item));
+                        encode_inlined_item(ecx, rbml_w,
+                                            InlinedItemRef::TraitItem(def_id, trait_item));
                     } else {
                         encode_item_sort(rbml_w, 'r');
                     }
@@ -1508,7 +1500,7 @@ fn encode_info_for_foreign_item(ecx: &EncodeContext,
         encode_bounds_and_type_for_item(rbml_w, ecx, nitem.id);
         encode_name(rbml_w, nitem.ident.name);
         if abi == abi::RustIntrinsic {
-            encode_inlined_item(ecx, rbml_w, IIForeignRef(nitem));
+            encode_inlined_item(ecx, rbml_w, InlinedItemRef::Foreign(nitem));
         }
         encode_attributes(rbml_w, &*nitem.attrs);
         let stab = stability::lookup(ecx.tcx, ast_util::local_def(nitem.id));
diff --git a/src/librustc/metadata/inline.rs b/src/librustc/metadata/inline.rs
new file mode 100644
index 00000000000..ba09e173fd8
--- /dev/null
+++ b/src/librustc/metadata/inline.rs
@@ -0,0 +1,64 @@
+// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use syntax::ast;
+use syntax::ast_util::{IdRange, IdRangeComputingVisitor,
+                       IdVisitor, IdVisitingOperation};
+use syntax::ptr::P;
+use syntax::visit::Visitor;
+use self::InlinedItem::*;
+
+/// The data we save and restore about an inlined item or method.  This is not
+/// part of the AST that we parse from a file, but it becomes part of the tree
+/// that we trans.
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
+pub enum InlinedItem {
+    Item(P<ast::Item>),
+    TraitItem(ast::DefId /* impl id */, P<ast::TraitItem>),
+    ImplItem(ast::DefId /* impl id */, P<ast::ImplItem>),
+    Foreign(P<ast::ForeignItem>),
+}
+
+/// A borrowed version of `ast::InlinedItem`.
+pub enum InlinedItemRef<'a> {
+    Item(&'a ast::Item),
+    TraitItem(ast::DefId, &'a ast::TraitItem),
+    ImplItem(ast::DefId, &'a ast::ImplItem),
+    Foreign(&'a ast::ForeignItem)
+}
+
+impl InlinedItem {
+    pub fn visit<'ast,V>(&'ast self, visitor: &mut V)
+        where V: Visitor<'ast>
+    {
+        match *self {
+            Item(ref i) => visitor.visit_item(&**i),
+            Foreign(ref i) => visitor.visit_foreign_item(&**i),
+            TraitItem(_, ref ti) => visitor.visit_trait_item(ti),
+            ImplItem(_, ref ii) => visitor.visit_impl_item(ii),
+        }
+    }
+
+    pub fn visit_ids<O: IdVisitingOperation>(&self, operation: &mut O) {
+        let mut id_visitor = IdVisitor {
+            operation: operation,
+            pass_through_items: true,
+            visited_outermost: false,
+        };
+        self.visit(&mut id_visitor);
+    }
+
+    pub fn compute_id_range(&self) -> IdRange {
+        let mut visitor = IdRangeComputingVisitor::new();
+        self.visit_ids(&mut visitor);
+        visitor.result()
+    }
+}
+
diff --git a/src/librustc/metadata/mod.rs b/src/librustc/metadata/mod.rs
index 0bf1e6d198f..44901eb0547 100644
--- a/src/librustc/metadata/mod.rs
+++ b/src/librustc/metadata/mod.rs
@@ -19,3 +19,4 @@ pub mod csearch;
 pub mod loader;
 pub mod filesearch;
 pub mod macro_import;
+pub mod inline;
diff --git a/src/librustc/middle/astencode.rs b/src/librustc/middle/astencode.rs
index c064b31173f..a07b849b400 100644
--- a/src/librustc/middle/astencode.rs
+++ b/src/librustc/middle/astencode.rs
@@ -17,16 +17,17 @@ use metadata::common as c;
 use metadata::cstore as cstore;
 use session::Session;
 use metadata::decoder;
-use middle::def;
 use metadata::encoder as e;
-use middle::region;
+use metadata::inline::{InlinedItem, InlinedItemRef};
 use metadata::tydecode;
 use metadata::tydecode::{DefIdSource, NominalType, TypeWithId};
 use metadata::tydecode::{RegionParameter, ClosureSource};
 use metadata::tyencode;
 use middle::cast;
 use middle::check_const::ConstQualif;
+use middle::def;
 use middle::privacy::{AllPublic, LastMod};
+use middle::region;
 use middle::subst;
 use middle::subst::VecPerParamSpace;
 use middle::ty::{self, Ty};
@@ -75,12 +76,12 @@ trait tr_intern {
 
 pub fn encode_inlined_item(ecx: &e::EncodeContext,
                            rbml_w: &mut Encoder,
-                           ii: e::InlinedItemRef) {
+                           ii: InlinedItemRef) {
     let id = match ii {
-        e::IIItemRef(i) => i.id,
-        e::IIForeignRef(i) => i.id,
-        e::IITraitItemRef(_, ti) => ti.id,
-        e::IIImplItemRef(_, ii) => ii.id,
+        InlinedItemRef::Item(i) => i.id,
+        InlinedItemRef::Foreign(i) => i.id,
+        InlinedItemRef::TraitItem(_, ti) => ti.id,
+        InlinedItemRef::ImplItem(_, ii) => ii.id,
     };
     debug!("> Encoding inlined item: {} ({:?})",
            ecx.tcx.map.path_to_string(id),
@@ -88,7 +89,7 @@ pub fn encode_inlined_item(ecx: &e::EncodeContext,
 
     // Folding could be avoided with a smarter encoder.
     let ii = simplify_ast(ii);
-    let id_range = ast_util::compute_id_range_for_inlined_item(&ii);
+    let id_range = ii.compute_id_range();
 
     rbml_w.start_tag(c::tag_ast as usize);
     id_range.encode(rbml_w);
@@ -124,7 +125,7 @@ pub fn decode_inlined_item<'tcx>(cdata: &cstore::crate_metadata,
                                  tcx: &ty::ctxt<'tcx>,
                                  path: Vec<ast_map::PathElem>,
                                  par_doc: rbml::Doc)
-                                 -> Result<&'tcx ast::InlinedItem, Vec<ast_map::PathElem>> {
+                                 -> Result<&'tcx InlinedItem, Vec<ast_map::PathElem>> {
     match par_doc.opt_child(c::tag_ast) {
       None => Err(path),
       Some(ast_doc) => {
@@ -150,10 +151,10 @@ pub fn decode_inlined_item<'tcx>(cdata: &cstore::crate_metadata,
         let ii = ast_map::map_decoded_item(&dcx.tcx.map, path, raw_ii, dcx);
 
         let ident = match *ii {
-            ast::IIItem(ref i) => i.ident,
-            ast::IIForeign(ref i) => i.ident,
-            ast::IITraitItem(_, ref ti) => ti.ident,
-            ast::IIImplItem(_, ref ii) => ii.ident
+            InlinedItem::Item(ref i) => i.ident,
+            InlinedItem::Foreign(ref i) => i.ident,
+            InlinedItem::TraitItem(_, ref ti) => ti.ident,
+            InlinedItem::ImplItem(_, ref ii) => ii.ident
         };
         debug!("Fn named: {}", ident);
         debug!("< Decoded inlined fn: {}::{}",
@@ -162,7 +163,7 @@ pub fn decode_inlined_item<'tcx>(cdata: &cstore::crate_metadata,
         region::resolve_inlined_item(&tcx.sess, &tcx.region_maps, ii);
         decode_side_tables(dcx, ast_doc);
         match *ii {
-          ast::IIItem(ref i) => {
+          InlinedItem::Item(ref i) => {
             debug!(">>> DECODED ITEM >>>\n{}\n<<< DECODED ITEM <<<",
                    syntax::print::pprust::item_to_string(&**i));
           }
@@ -349,7 +350,7 @@ impl<D:serialize::Decoder> def_id_decoder_helpers for D
 // We also have to adjust the spans: for now we just insert a dummy span,
 // but eventually we should add entries to the local codemap as required.
 
-fn encode_ast(rbml_w: &mut Encoder, item: &ast::InlinedItem) {
+fn encode_ast(rbml_w: &mut Encoder, item: &InlinedItem) {
     rbml_w.start_tag(c::tag_tree as usize);
     item.encode(rbml_w);
     rbml_w.end_tag();
@@ -399,34 +400,34 @@ impl Folder for NestedItemsDropper {
 // As it happens, trans relies on the fact that we do not export
 // nested items, as otherwise it would get confused when translating
 // inlined items.
-fn simplify_ast(ii: e::InlinedItemRef) -> ast::InlinedItem {
+fn simplify_ast(ii: InlinedItemRef) -> InlinedItem {
     let mut fld = NestedItemsDropper;
 
     match ii {
         // HACK we're not dropping items.
-        e::IIItemRef(i) => {
-            ast::IIItem(fold::noop_fold_item(P(i.clone()), &mut fld)
+        InlinedItemRef::Item(i) => {
+            InlinedItem::Item(fold::noop_fold_item(P(i.clone()), &mut fld)
                             .expect_one("expected one item"))
         }
-        e::IITraitItemRef(d, ti) => {
-            ast::IITraitItem(d,
+        InlinedItemRef::TraitItem(d, ti) => {
+            InlinedItem::TraitItem(d,
                 fold::noop_fold_trait_item(P(ti.clone()), &mut fld)
                     .expect_one("noop_fold_trait_item must produce \
                                  exactly one trait item"))
         }
-        e::IIImplItemRef(d, ii) => {
-            ast::IIImplItem(d,
+        InlinedItemRef::ImplItem(d, ii) => {
+            InlinedItem::ImplItem(d,
                 fold::noop_fold_impl_item(P(ii.clone()), &mut fld)
                     .expect_one("noop_fold_impl_item must produce \
                                  exactly one impl item"))
         }
-        e::IIForeignRef(i) => {
-            ast::IIForeign(fold::noop_fold_foreign_item(P(i.clone()), &mut fld))
+        InlinedItemRef::Foreign(i) => {
+            InlinedItem::Foreign(fold::noop_fold_foreign_item(P(i.clone()), &mut fld))
         }
     }
 }
 
-fn decode_ast(par_doc: rbml::Doc) -> ast::InlinedItem {
+fn decode_ast(par_doc: rbml::Doc) -> InlinedItem {
     let chi_doc = par_doc.get(c::tag_tree as usize);
     let mut d = reader::Decoder::new(chi_doc);
     Decodable::decode(&mut d).unwrap()
@@ -920,9 +921,9 @@ impl<'a, 'b, 'c, 'tcx> ast_util::IdVisitingOperation for
 
 fn encode_side_tables_for_ii(ecx: &e::EncodeContext,
                              rbml_w: &mut Encoder,
-                             ii: &ast::InlinedItem) {
+                             ii: &InlinedItem) {
     rbml_w.start_tag(c::tag_table as usize);
-    ast_util::visit_ids_for_inlined_item(ii, &mut SideTableEncodingIdVisitor {
+    ii.visit_ids(&mut SideTableEncodingIdVisitor {
         ecx: ecx,
         rbml_w: rbml_w
     });
@@ -1644,15 +1645,15 @@ fn test_simplification() {
             return alist {eq_fn: eq_int, data: Vec::new()};
         }
     ).unwrap();
-    let item_in = e::IIItemRef(&*item);
+    let item_in = InlinedItemRef::Item(&*item);
     let item_out = simplify_ast(item_in);
-    let item_exp = ast::IIItem(quote_item!(&cx,
+    let item_exp = InlinedItem::Item(quote_item!(&cx,
         fn new_int_alist<B>() -> alist<isize, B> {
             return alist {eq_fn: eq_int, data: Vec::new()};
         }
     ).unwrap());
     match (item_out, item_exp) {
-      (ast::IIItem(item_out), ast::IIItem(item_exp)) => {
+      (InlinedItem::Item(item_out), InlinedItem::Item(item_exp)) => {
         assert!(pprust::item_to_string(&*item_out) ==
                 pprust::item_to_string(&*item_exp));
       }
diff --git a/src/librustc/middle/const_eval.rs b/src/librustc/middle/const_eval.rs
index fd1c8d4892a..a1327df224a 100644
--- a/src/librustc/middle/const_eval.rs
+++ b/src/librustc/middle/const_eval.rs
@@ -17,6 +17,7 @@ use self::EvalHint::*;
 use ast_map;
 use ast_map::blocks::FnLikeNode;
 use metadata::csearch;
+use metadata::inline::InlinedItem;
 use middle::{astencode, def, infer, subst, traits};
 use middle::pat_util::def_to_path;
 use middle::ty::{self, Ty};
@@ -86,7 +87,7 @@ fn lookup_variant_by_id<'a>(tcx: &'a ty::ctxt,
         }
         let expr_id = match csearch::maybe_get_item_ast(tcx, enum_def,
             Box::new(|a, b, c, d| astencode::decode_inlined_item(a, b, c, d))) {
-            csearch::FoundAst::Found(&ast::IIItem(ref item)) => match item.node {
+            csearch::FoundAst::Found(&InlinedItem::Item(ref item)) => match item.node {
                 ast::ItemEnum(ast::EnumDef { ref variants }, _) => {
                     // NOTE this doesn't do the right thing, it compares inlined
                     // NodeId's to the original variant_def's NodeId, but they
@@ -161,11 +162,11 @@ pub fn lookup_const_by_id<'a, 'tcx: 'a>(tcx: &'a ty::ctxt<'tcx>,
         let mut used_ref_id = false;
         let expr_id = match csearch::maybe_get_item_ast(tcx, def_id,
             Box::new(|a, b, c, d| astencode::decode_inlined_item(a, b, c, d))) {
-            csearch::FoundAst::Found(&ast::IIItem(ref item)) => match item.node {
+            csearch::FoundAst::Found(&InlinedItem::Item(ref item)) => match item.node {
                 ast::ItemConst(_, ref const_expr) => Some(const_expr.id),
                 _ => None
             },
-            csearch::FoundAst::Found(&ast::IITraitItem(trait_id, ref ti)) => match ti.node {
+            csearch::FoundAst::Found(&InlinedItem::TraitItem(trait_id, ref ti)) => match ti.node {
                 ast::ConstTraitItem(_, _) => {
                     used_ref_id = true;
                     match maybe_ref_id {
@@ -184,7 +185,7 @@ pub fn lookup_const_by_id<'a, 'tcx: 'a>(tcx: &'a ty::ctxt<'tcx>,
                 }
                 _ => None
             },
-            csearch::FoundAst::Found(&ast::IIImplItem(_, ref ii)) => match ii.node {
+            csearch::FoundAst::Found(&InlinedItem::ImplItem(_, ref ii)) => match ii.node {
                 ast::ConstImplItem(_, ref expr) => Some(expr.id),
                 _ => None
             },
@@ -217,8 +218,8 @@ fn inline_const_fn_from_external_crate(tcx: &ty::ctxt, def_id: ast::DefId)
 
     let fn_id = match csearch::maybe_get_item_ast(tcx, def_id,
         box |a, b, c, d| astencode::decode_inlined_item(a, b, c, d)) {
-        csearch::FoundAst::Found(&ast::IIItem(ref item)) => Some(item.id),
-        csearch::FoundAst::Found(&ast::IIImplItem(_, ref item)) => Some(item.id),
+        csearch::FoundAst::Found(&InlinedItem::Item(ref item)) => Some(item.id),
+        csearch::FoundAst::Found(&InlinedItem::ImplItem(_, ref item)) => Some(item.id),
         _ => None
     };
     tcx.extern_const_fns.borrow_mut().insert(def_id,
diff --git a/src/librustc/middle/region.rs b/src/librustc/middle/region.rs
index 2a033d36a47..dafc1e900f3 100644
--- a/src/librustc/middle/region.rs
+++ b/src/librustc/middle/region.rs
@@ -17,8 +17,9 @@
 //! `middle/typeck/infer/region_inference.rs`
 
 use ast_map;
-use session::Session;
+use metadata::inline::InlinedItem;
 use middle::ty::{self, Ty};
+use session::Session;
 use util::nodemap::{FnvHashMap, FnvHashSet, NodeMap};
 
 use std::cell::RefCell;
@@ -1231,7 +1232,7 @@ pub fn resolve_crate(sess: &Session, krate: &ast::Crate) -> RegionMaps {
 
 pub fn resolve_inlined_item(sess: &Session,
                             region_maps: &RegionMaps,
-                            item: &ast::InlinedItem) {
+                            item: &InlinedItem) {
     let mut visitor = RegionResolutionVisitor {
         sess: sess,
         region_maps: region_maps,
@@ -1241,5 +1242,5 @@ pub fn resolve_inlined_item(sess: &Session,
             var_parent: InnermostDeclaringBlock::None
         }
     };
-    visit::walk_inlined_item(&mut visitor, item);
+    item.visit(&mut visitor);
 }
diff --git a/src/librustc_trans/trans/inline.rs b/src/librustc_trans/trans/inline.rs
index 01bfc51a5c0..c6450d06eb6 100644
--- a/src/librustc_trans/trans/inline.rs
+++ b/src/librustc_trans/trans/inline.rs
@@ -10,6 +10,7 @@
 
 use llvm::{AvailableExternallyLinkage, InternalLinkage, SetLinkage};
 use metadata::csearch;
+use metadata::inline::InlinedItem;
 use middle::astencode;
 use middle::subst::Substs;
 use trans::base::{push_ctxt, trans_item, get_item_val, trans_fn};
@@ -48,7 +49,7 @@ fn instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId)
             ccx.external().borrow_mut().insert(fn_id, None);
             return None;
         }
-        csearch::FoundAst::Found(&ast::IIItem(ref item)) => {
+        csearch::FoundAst::Found(&InlinedItem::Item(ref item)) => {
             ccx.external().borrow_mut().insert(fn_id, Some(item.id));
             ccx.external_srcs().borrow_mut().insert(item.id, fn_id);
 
@@ -91,12 +92,12 @@ fn instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId)
 
             item.id
         }
-        csearch::FoundAst::Found(&ast::IIForeign(ref item)) => {
+        csearch::FoundAst::Found(&InlinedItem::Foreign(ref item)) => {
             ccx.external().borrow_mut().insert(fn_id, Some(item.id));
             ccx.external_srcs().borrow_mut().insert(item.id, fn_id);
             item.id
         }
-        csearch::FoundAst::FoundParent(parent_id, &ast::IIItem(ref item)) => {
+        csearch::FoundAst::FoundParent(parent_id, &InlinedItem::Item(ref item)) => {
             ccx.external().borrow_mut().insert(parent_id, Some(item.id));
             ccx.external_srcs().borrow_mut().insert(item.id, parent_id);
 
@@ -131,7 +132,7 @@ fn instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId)
             ccx.sess().bug("maybe_get_item_ast returned a FoundParent \
                             with a non-item parent");
         }
-        csearch::FoundAst::Found(&ast::IITraitItem(_, ref trait_item)) => {
+        csearch::FoundAst::Found(&InlinedItem::TraitItem(_, ref trait_item)) => {
             ccx.external().borrow_mut().insert(fn_id, Some(trait_item.id));
             ccx.external_srcs().borrow_mut().insert(trait_item.id, fn_id);
 
@@ -150,7 +151,7 @@ fn instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId)
             // don't.
             trait_item.id
         }
-        csearch::FoundAst::Found(&ast::IIImplItem(impl_did, ref impl_item)) => {
+        csearch::FoundAst::Found(&InlinedItem::ImplItem(impl_did, ref impl_item)) => {
             ccx.external().borrow_mut().insert(fn_id, Some(impl_item.id));
             ccx.external_srcs().borrow_mut().insert(impl_item.id, fn_id);
 
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 08c6dcc7f87..0bcd97cfe87 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -23,7 +23,6 @@ pub use self::FloatTy::*;
 pub use self::FunctionRetTy::*;
 pub use self::ForeignItem_::*;
 pub use self::ImplItem_::*;
-pub use self::InlinedItem::*;
 pub use self::IntTy::*;
 pub use self::Item_::*;
 pub use self::KleeneOp::*;
@@ -1925,17 +1924,6 @@ impl ForeignItem_ {
     }
 }
 
-/// The data we save and restore about an inlined item or method.  This is not
-/// part of the AST that we parse from a file, but it becomes part of the tree
-/// that we trans.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
-pub enum InlinedItem {
-    IIItem(P<Item>),
-    IITraitItem(DefId /* impl id */, P<TraitItem>),
-    IIImplItem(DefId /* impl id */, P<ImplItem>),
-    IIForeign(P<ForeignItem>),
-}
-
 /// A macro definition, in this crate or imported from another.
 ///
 /// Not parsed directly, but created on macro import or `macro_rules!` expansion.
diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
index 83d3c9c4ec5..7aff92ecb70 100644
--- a/src/libsyntax/ast_util.rs
+++ b/src/libsyntax/ast_util.rs
@@ -503,19 +503,18 @@ impl<'a, 'v, O: IdVisitingOperation> Visitor<'v> for IdVisitor<'a, O> {
     }
 }
 
-pub fn visit_ids_for_inlined_item<O: IdVisitingOperation>(item: &InlinedItem,
-                                                          operation: &mut O) {
-    let mut id_visitor = IdVisitor {
-        operation: operation,
-        pass_through_items: true,
-        visited_outermost: false,
-    };
-
-    visit::walk_inlined_item(&mut id_visitor, item);
+pub struct IdRangeComputingVisitor {
+    result: IdRange,
 }
 
-struct IdRangeComputingVisitor {
-    result: IdRange,
+impl IdRangeComputingVisitor {
+    pub fn new() -> IdRangeComputingVisitor {
+        IdRangeComputingVisitor { result: IdRange::max() }
+    }
+
+    pub fn result(&self) -> IdRange {
+        self.result
+    }
 }
 
 impl IdVisitingOperation for IdRangeComputingVisitor {
@@ -524,14 +523,6 @@ impl IdVisitingOperation for IdRangeComputingVisitor {
     }
 }
 
-pub fn compute_id_range_for_inlined_item(item: &InlinedItem) -> IdRange {
-    let mut visitor = IdRangeComputingVisitor {
-        result: IdRange::max()
-    };
-    visit_ids_for_inlined_item(item, &mut visitor);
-    visitor.result
-}
-
 /// Computes the id range for a single fn body, ignoring nested items.
 pub fn compute_id_range_for_fn_body(fk: visit::FnKind,
                                     decl: &FnDecl,
@@ -540,9 +531,7 @@ pub fn compute_id_range_for_fn_body(fk: visit::FnKind,
                                     id: NodeId)
                                     -> IdRange
 {
-    let mut visitor = IdRangeComputingVisitor {
-        result: IdRange::max()
-    };
+    let mut visitor = IdRangeComputingVisitor::new();
     let mut id_visitor = IdVisitor {
         operation: &mut visitor,
         pass_through_items: false,
diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs
index ad144d6033b..259564337a2 100644
--- a/src/libsyntax/visit.rs
+++ b/src/libsyntax/visit.rs
@@ -142,17 +142,6 @@ pub trait Visitor<'v> : Sized {
     fn visit_attribute(&mut self, _attr: &'v Attribute) {}
 }
 
-pub fn walk_inlined_item<'v,V>(visitor: &mut V, item: &'v InlinedItem)
-                         where V: Visitor<'v> {
-    match *item {
-        IIItem(ref i) => visitor.visit_item(&**i),
-        IIForeign(ref i) => visitor.visit_foreign_item(&**i),
-        IITraitItem(_, ref ti) => visitor.visit_trait_item(ti),
-        IIImplItem(_, ref ii) => visitor.visit_impl_item(ii),
-    }
-}
-
-
 pub fn walk_crate<'v, V: Visitor<'v>>(visitor: &mut V, krate: &'v Crate) {
     visitor.visit_mod(&krate.module, krate.span, CRATE_NODE_ID);
     for attr in &krate.attrs {