Auto merge of #63213 - varkor:itemkind-tyalias, r=Centril

Rename `ItemKind::Ty` to `ItemKind::TyAlias`

The current name is not entirely clear without context and `TyAlias` is consistent with `ItemKind::TraitAlias`.

36 files changed, 90 insertions, 89 deletions

diff --git a/src/librustc/hir/check_attr.rs b/src/librustc/hir/check_attr.rs
index db90e44b892..22124d4ee41 100644
--- a/src/librustc/hir/check_attr.rs
+++ b/src/librustc/hir/check_attr.rs
@@ -26,7 +26,7 @@ pub(crate) enum Target {
     Mod,
     ForeignMod,
     GlobalAsm,
-    Ty,
+    TyAlias,
     OpaqueTy,
     Enum,
     Struct,
@@ -50,7 +50,7 @@ impl Display for Target {
             Target::Mod => "module",
             Target::ForeignMod => "foreign module",
             Target::GlobalAsm => "global asm",
-            Target::Ty => "type alias",
+            Target::TyAlias => "type alias",
             Target::OpaqueTy => "opaque type",
             Target::Enum => "enum",
             Target::Struct => "struct",
@@ -75,7 +75,7 @@ impl Target {
             hir::ItemKind::Mod(..) => Target::Mod,
             hir::ItemKind::ForeignMod(..) => Target::ForeignMod,
             hir::ItemKind::GlobalAsm(..) => Target::GlobalAsm,
-            hir::ItemKind::Ty(..) => Target::Ty,
+            hir::ItemKind::TyAlias(..) => Target::TyAlias,
             hir::ItemKind::OpaqueTy(..) => Target::OpaqueTy,
             hir::ItemKind::Enum(..) => Target::Enum,
             hir::ItemKind::Struct(..) => Target::Struct,
diff --git a/src/librustc/hir/intravisit.rs b/src/librustc/hir/intravisit.rs
index 625e746c24f..b5c760bc9a0 100644
--- a/src/librustc/hir/intravisit.rs
+++ b/src/librustc/hir/intravisit.rs
@@ -500,7 +500,7 @@ pub fn walk_item<'v, V: Visitor<'v>>(visitor: &mut V, item: &'v Item) {
         ItemKind::GlobalAsm(_) => {
             visitor.visit_id(item.hir_id);
         }
-        ItemKind::Ty(ref ty, ref generics) => {
+        ItemKind::TyAlias(ref ty, ref generics) => {
             visitor.visit_id(item.hir_id);
             visitor.visit_ty(ty);
             visitor.visit_generics(generics)
@@ -926,7 +926,7 @@ pub fn walk_impl_item<'v, V: Visitor<'v>>(visitor: &mut V, impl_item: &'v ImplIt
                              impl_item.span,
                              impl_item.hir_id);
         }
-        ImplItemKind::Type(ref ty) => {
+        ImplItemKind::TyAlias(ref ty) => {
             visitor.visit_id(impl_item.hir_id);
             visitor.visit_ty(ty);
         }
diff --git a/src/librustc/hir/lowering.rs b/src/librustc/hir/lowering.rs
index f76de96cd10..429eb6b3102 100644
--- a/src/librustc/hir/lowering.rs
+++ b/src/librustc/hir/lowering.rs
@@ -486,7 +486,7 @@ impl<'a> LoweringContext<'a> {
                     ItemKind::Struct(_, ref generics)
                     | ItemKind::Union(_, ref generics)
                     | ItemKind::Enum(_, ref generics)
-                    | ItemKind::Ty(_, ref generics)
+                    | ItemKind::TyAlias(_, ref generics)
                     | ItemKind::OpaqueTy(_, ref generics)
                     | ItemKind::Trait(_, _, ref generics, ..) => {
                         let def_id = self.lctx.resolver.definitions().local_def_id(item.id);
@@ -3440,7 +3440,7 @@ impl<'a> LoweringContext<'a> {
             ItemKind::Mod(ref m) => hir::ItemKind::Mod(self.lower_mod(m)),
             ItemKind::ForeignMod(ref nm) => hir::ItemKind::ForeignMod(self.lower_foreign_mod(nm)),
             ItemKind::GlobalAsm(ref ga) => hir::ItemKind::GlobalAsm(self.lower_global_asm(ga)),
-            ItemKind::Ty(ref t, ref generics) => hir::ItemKind::Ty(
+            ItemKind::TyAlias(ref t, ref generics) => hir::ItemKind::TyAlias(
                 self.lower_ty(t, ImplTraitContext::disallowed()),
                 self.lower_generics(generics, ImplTraitContext::disallowed()),
             ),
@@ -3914,9 +3914,9 @@ impl<'a> LoweringContext<'a> {
 
                 (generics, hir::ImplItemKind::Method(sig, body_id))
             }
-            ImplItemKind::Type(ref ty) => (
+            ImplItemKind::TyAlias(ref ty) => (
                 self.lower_generics(&i.generics, ImplTraitContext::disallowed()),
-                hir::ImplItemKind::Type(self.lower_ty(ty, ImplTraitContext::disallowed())),
+                hir::ImplItemKind::TyAlias(self.lower_ty(ty, ImplTraitContext::disallowed())),
             ),
             ImplItemKind::OpaqueTy(ref bounds) => (
                 self.lower_generics(&i.generics, ImplTraitContext::disallowed()),
@@ -3950,7 +3950,7 @@ impl<'a> LoweringContext<'a> {
             defaultness: self.lower_defaultness(i.defaultness, true /* [1] */),
             kind: match i.node {
                 ImplItemKind::Const(..) => hir::AssocItemKind::Const,
-                ImplItemKind::Type(..) => hir::AssocItemKind::Type,
+                ImplItemKind::TyAlias(..) => hir::AssocItemKind::Type,
                 ImplItemKind::OpaqueTy(..) => hir::AssocItemKind::OpaqueTy,
                 ImplItemKind::Method(ref sig, _) => hir::AssocItemKind::Method {
                     has_self: sig.decl.has_self(),
diff --git a/src/librustc/hir/map/def_collector.rs b/src/librustc/hir/map/def_collector.rs
index c44942a1626..2964b130ddd 100644
--- a/src/librustc/hir/map/def_collector.rs
+++ b/src/librustc/hir/map/def_collector.rs
@@ -93,7 +93,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
             ItemKind::Mod(..) | ItemKind::Trait(..) | ItemKind::TraitAlias(..) |
             ItemKind::Enum(..) | ItemKind::Struct(..) | ItemKind::Union(..) |
             ItemKind::OpaqueTy(..) | ItemKind::ExternCrate(..) | ItemKind::ForeignMod(..) |
-            ItemKind::Ty(..) => DefPathData::TypeNs(i.ident.as_interned_str()),
+            ItemKind::TyAlias(..) => DefPathData::TypeNs(i.ident.as_interned_str()),
             ItemKind::Fn(
                 ref decl,
                 ref header,
@@ -222,7 +222,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
             }
             ImplItemKind::Method(..) | ImplItemKind::Const(..) =>
                 DefPathData::ValueNs(ii.ident.as_interned_str()),
-            ImplItemKind::Type(..) |
+            ImplItemKind::TyAlias(..) |
             ImplItemKind::OpaqueTy(..) => {
                 DefPathData::TypeNs(ii.ident.as_interned_str())
             },
diff --git a/src/librustc/hir/map/mod.rs b/src/librustc/hir/map/mod.rs
index b93961a1239..0d477ae7968 100644
--- a/src/librustc/hir/map/mod.rs
+++ b/src/librustc/hir/map/mod.rs
@@ -302,7 +302,7 @@ impl<'hir> Map<'hir> {
                     ItemKind::Fn(..) => DefKind::Fn,
                     ItemKind::Mod(..) => DefKind::Mod,
                     ItemKind::OpaqueTy(..) => DefKind::OpaqueTy,
-                    ItemKind::Ty(..) => DefKind::TyAlias,
+                    ItemKind::TyAlias(..) => DefKind::TyAlias,
                     ItemKind::Enum(..) => DefKind::Enum,
                     ItemKind::Struct(..) => DefKind::Struct,
                     ItemKind::Union(..) => DefKind::Union,
@@ -333,7 +333,7 @@ impl<'hir> Map<'hir> {
                 match item.node {
                     ImplItemKind::Const(..) => DefKind::AssocConst,
                     ImplItemKind::Method(..) => DefKind::Method,
-                    ImplItemKind::Type(..) => DefKind::AssocTy,
+                    ImplItemKind::TyAlias(..) => DefKind::AssocTy,
                     ImplItemKind::OpaqueTy(..) => DefKind::AssocOpaqueTy,
                 }
             }
@@ -576,7 +576,7 @@ impl<'hir> Map<'hir> {
                 Node::Item(ref item) => {
                     match item.node {
                         ItemKind::Fn(_, _, ref generics, _) |
-                        ItemKind::Ty(_, ref generics) |
+                        ItemKind::TyAlias(_, ref generics) |
                         ItemKind::Enum(_, ref generics) |
                         ItemKind::Struct(_, ref generics) |
                         ItemKind::Union(_, ref generics) |
@@ -1269,7 +1269,7 @@ fn hir_id_to_string(map: &Map<'_>, id: HirId, include_id: bool) -> String {
                 ItemKind::Mod(..) => "mod",
                 ItemKind::ForeignMod(..) => "foreign mod",
                 ItemKind::GlobalAsm(..) => "global asm",
-                ItemKind::Ty(..) => "ty",
+                ItemKind::TyAlias(..) => "ty",
                 ItemKind::OpaqueTy(..) => "opaque type",
                 ItemKind::Enum(..) => "enum",
                 ItemKind::Struct(..) => "struct",
@@ -1291,7 +1291,7 @@ fn hir_id_to_string(map: &Map<'_>, id: HirId, include_id: bool) -> String {
                 ImplItemKind::Method(..) => {
                     format!("method {} in {}{}", ii.ident, path_str(), id_str)
                 }
-                ImplItemKind::Type(_) => {
+                ImplItemKind::TyAlias(_) => {
                     format!("assoc type {} in {}{}", ii.ident, path_str(), id_str)
                 }
                 ImplItemKind::OpaqueTy(_) => {
diff --git a/src/librustc/hir/mod.rs b/src/librustc/hir/mod.rs
index 5fe8069e332..b8d8394a02c 100644
--- a/src/librustc/hir/mod.rs
+++ b/src/librustc/hir/mod.rs
@@ -1837,7 +1837,7 @@ pub enum ImplItemKind {
     /// A method implementation with the given signature and body.
     Method(MethodSig, BodyId),
     /// An associated type.
-    Type(P<Ty>),
+    TyAlias(P<Ty>),
     /// An associated `type = impl Trait`.
     OpaqueTy(GenericBounds),
 }
@@ -2420,7 +2420,7 @@ pub enum ItemKind {
     /// Module-level inline assembly (from global_asm!)
     GlobalAsm(P<GlobalAsm>),
     /// A type alias, e.g., `type Foo = Bar<u8>`
-    Ty(P<Ty>, Generics),
+    TyAlias(P<Ty>, Generics),
     /// An opaque `impl Trait` type alias, e.g., `type Foo = impl Bar;`
     OpaqueTy(OpaqueTy),
     /// An enum definition, e.g., `enum Foo<A, B> {C<A>, D<B>}`
@@ -2455,7 +2455,7 @@ impl ItemKind {
             ItemKind::Mod(..) => "module",
             ItemKind::ForeignMod(..) => "foreign module",
             ItemKind::GlobalAsm(..) => "global asm",
-            ItemKind::Ty(..) => "type alias",
+            ItemKind::TyAlias(..) => "type alias",
             ItemKind::OpaqueTy(..) => "opaque type",
             ItemKind::Enum(..) => "enum",
             ItemKind::Struct(..) => "struct",
@@ -2478,7 +2478,7 @@ impl ItemKind {
     pub fn generics(&self) -> Option<&Generics> {
         Some(match *self {
             ItemKind::Fn(_, _, ref generics, _) |
-            ItemKind::Ty(_, ref generics) |
+            ItemKind::TyAlias(_, ref generics) |
             ItemKind::OpaqueTy(OpaqueTy { ref generics, impl_trait_fn: None, .. }) |
             ItemKind::Enum(_, ref generics) |
             ItemKind::Struct(_, ref generics) |
diff --git a/src/librustc/hir/print.rs b/src/librustc/hir/print.rs
index a8760438fc0..11ba5120530 100644
--- a/src/librustc/hir/print.rs
+++ b/src/librustc/hir/print.rs
@@ -570,7 +570,7 @@ impl<'a> State<'a> {
                 self.s.word(ga.asm.as_str().to_string());
                 self.end()
             }
-            hir::ItemKind::Ty(ref ty, ref generics) => {
+            hir::ItemKind::TyAlias(ref ty, ref generics) => {
                 self.print_item_type(item, &generics, |state| {
                     state.word_space("=");
                     state.print_type(&ty);
@@ -908,7 +908,7 @@ impl<'a> State<'a> {
                 self.end(); // need to close a box
                 self.ann.nested(self, Nested::Body(body));
             }
-            hir::ImplItemKind::Type(ref ty) => {
+            hir::ImplItemKind::TyAlias(ref ty) => {
                 self.print_associated_type(ii.ident, None, Some(ty));
             }
             hir::ImplItemKind::OpaqueTy(ref bounds) => {
diff --git a/src/librustc/infer/error_reporting/mod.rs b/src/librustc/infer/error_reporting/mod.rs
index f92e0336244..8d0ead5c8fe 100644
--- a/src/librustc/infer/error_reporting/mod.rs
+++ b/src/librustc/infer/error_reporting/mod.rs
@@ -270,7 +270,7 @@ impl<'tcx> TyCtxt<'tcx> {
             hir::ImplItemKind::Method(..) => "method body",
             hir::ImplItemKind::Const(..)
             | hir::ImplItemKind::OpaqueTy(..)
-            | hir::ImplItemKind::Type(..) => "associated item",
+            | hir::ImplItemKind::TyAlias(..) => "associated item",
         }
     }
 
diff --git a/src/librustc/middle/dead.rs b/src/librustc/middle/dead.rs
index fefb3dc076d..55fa261f1ed 100644
--- a/src/librustc/middle/dead.rs
+++ b/src/librustc/middle/dead.rs
@@ -480,7 +480,7 @@ impl DeadVisitor<'tcx> {
             hir::ItemKind::Static(..)
             | hir::ItemKind::Const(..)
             | hir::ItemKind::Fn(..)
-            | hir::ItemKind::Ty(..)
+            | hir::ItemKind::TyAlias(..)
             | hir::ItemKind::Enum(..)
             | hir::ItemKind::Struct(..)
             | hir::ItemKind::Union(..) => true,
@@ -640,7 +640,7 @@ impl Visitor<'tcx> for DeadVisitor<'tcx> {
                 self.visit_nested_body(body_id)
             }
             hir::ImplItemKind::OpaqueTy(..) |
-            hir::ImplItemKind::Type(..) => {}
+            hir::ImplItemKind::TyAlias(..) => {}
         }
     }
 
diff --git a/src/librustc/middle/reachable.rs b/src/librustc/middle/reachable.rs
index 233cec2ef7d..76d8a6738f0 100644
--- a/src/librustc/middle/reachable.rs
+++ b/src/librustc/middle/reachable.rs
@@ -189,7 +189,7 @@ impl<'a, 'tcx> ReachableContext<'a, 'tcx> {
                         }
                     }
                     hir::ImplItemKind::OpaqueTy(..) |
-                    hir::ImplItemKind::Type(_) => false,
+                    hir::ImplItemKind::TyAlias(_) => false,
                 }
             }
             Some(_) => false,
@@ -264,7 +264,7 @@ impl<'a, 'tcx> ReachableContext<'a, 'tcx> {
                     hir::ItemKind::ExternCrate(_) |
                     hir::ItemKind::Use(..) |
                     hir::ItemKind::OpaqueTy(..) |
-                    hir::ItemKind::Ty(..) |
+                    hir::ItemKind::TyAlias(..) |
                     hir::ItemKind::Static(..) |
                     hir::ItemKind::Mod(..) |
                     hir::ItemKind::ForeignMod(..) |
@@ -302,7 +302,7 @@ impl<'a, 'tcx> ReachableContext<'a, 'tcx> {
                         }
                     }
                     hir::ImplItemKind::OpaqueTy(..) |
-                    hir::ImplItemKind::Type(_) => {}
+                    hir::ImplItemKind::TyAlias(_) => {}
                 }
             }
             Node::Expr(&hir::Expr { node: hir::ExprKind::Closure(.., body, _, _), .. }) => {
diff --git a/src/librustc/middle/resolve_lifetime.rs b/src/librustc/middle/resolve_lifetime.rs
index 80f85bec879..f8f01f79e1d 100644
--- a/src/librustc/middle/resolve_lifetime.rs
+++ b/src/librustc/middle/resolve_lifetime.rs
@@ -488,7 +488,7 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
                 // items. Doing anything on this node is irrelevant, as we currently don't need
                 // it.
             }
-            hir::ItemKind::Ty(_, ref generics)
+            hir::ItemKind::TyAlias(_, ref generics)
             | hir::ItemKind::OpaqueTy(hir::OpaqueTy {
                 impl_trait_fn: None,
                 ref generics,
@@ -828,7 +828,7 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
                     |this| intravisit::walk_impl_item(this, impl_item),
                 )
             }
-            Type(ref ty) => {
+            TyAlias(ref ty) => {
                 let generics = &impl_item.generics;
                 let mut index = self.next_early_index();
                 let mut non_lifetime_count = 0;
@@ -1259,7 +1259,7 @@ fn compute_object_lifetime_defaults(tcx: TyCtxt<'_>) -> HirIdMap<Vec<ObjectLifet
                 impl_trait_fn: None,
                 ..
             })
-            | hir::ItemKind::Ty(_, ref generics)
+            | hir::ItemKind::TyAlias(_, ref generics)
             | hir::ItemKind::Trait(_, _, ref generics, ..) => {
                 let result = object_lifetime_defaults_for_item(tcx, generics);
 
diff --git a/src/librustc_incremental/persist/dirty_clean.rs b/src/librustc_incremental/persist/dirty_clean.rs
index e621101324d..e569a9bc7df 100644
--- a/src/librustc_incremental/persist/dirty_clean.rs
+++ b/src/librustc_incremental/persist/dirty_clean.rs
@@ -354,7 +354,7 @@ impl DirtyCleanVisitor<'tcx> {
                     HirItem::GlobalAsm(..) => ("ItemGlobalAsm", LABELS_HIR_ONLY),
 
                     // A type alias, e.g., `type Foo = Bar<u8>`
-                    HirItem::Ty(..) => ("ItemTy", LABELS_HIR_ONLY),
+                    HirItem::TyAlias(..) => ("ItemTy", LABELS_HIR_ONLY),
 
                     // An enum definition, e.g., `enum Foo<A, B> {C<A>, D<B>}`
                     HirItem::Enum(..) => ("ItemEnum", LABELS_ADT),
@@ -405,7 +405,7 @@ impl DirtyCleanVisitor<'tcx> {
                 match item.node {
                     ImplItemKind::Method(..) => ("Node::ImplItem", LABELS_FN_IN_IMPL),
                     ImplItemKind::Const(..) => ("NodeImplConst", LABELS_CONST_IN_IMPL),
-                    ImplItemKind::Type(..) => ("NodeImplType", LABELS_CONST_IN_IMPL),
+                    ImplItemKind::TyAlias(..) => ("NodeImplType", LABELS_CONST_IN_IMPL),
                     ImplItemKind::OpaqueTy(..) => ("NodeImplType", LABELS_CONST_IN_IMPL),
                 }
             },
diff --git a/src/librustc_lint/builtin.rs b/src/librustc_lint/builtin.rs
index 08a8d400779..c9153f285ff 100644
--- a/src/librustc_lint/builtin.rs
+++ b/src/librustc_lint/builtin.rs
@@ -117,7 +117,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BoxPointers {
     fn check_item(&mut self, cx: &LateContext<'_, '_>, it: &hir::Item) {
         match it.node {
             hir::ItemKind::Fn(..) |
-            hir::ItemKind::Ty(..) |
+            hir::ItemKind::TyAlias(..) |
             hir::ItemKind::Enum(..) |
             hir::ItemKind::Struct(..) |
             hir::ItemKind::Union(..) => {
@@ -406,7 +406,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingDoc {
                 }
                 "a trait"
             }
-            hir::ItemKind::Ty(..) => "a type alias",
+            hir::ItemKind::TyAlias(..) => "a type alias",
             hir::ItemKind::Impl(.., Some(ref trait_ref), _, ref impl_item_refs) => {
                 // If the trait is private, add the impl items to `private_traits` so they don't get
                 // reported for missing docs.
@@ -460,7 +460,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingDoc {
         let desc = match impl_item.node {
             hir::ImplItemKind::Const(..) => "an associated constant",
             hir::ImplItemKind::Method(..) => "a method",
-            hir::ImplItemKind::Type(_) => "an associated type",
+            hir::ImplItemKind::TyAlias(_) => "an associated type",
             hir::ImplItemKind::OpaqueTy(_) => "an associated `impl Trait` type",
         };
         self.check_missing_docs_attrs(cx,
@@ -1123,7 +1123,7 @@ impl TypeAliasBounds {
 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for TypeAliasBounds {
     fn check_item(&mut self, cx: &LateContext<'_, '_>, item: &hir::Item) {
         let (ty, type_alias_generics) = match item.node {
-            hir::ItemKind::Ty(ref ty, ref generics) => (&*ty, generics),
+            hir::ItemKind::TyAlias(ref ty, ref generics) => (&*ty, generics),
             _ => return,
         };
         let mut suggested_changing_assoc_types = false;
diff --git a/src/librustc_lint/nonstandard_style.rs b/src/librustc_lint/nonstandard_style.rs
index 84f068ab50a..8f7fe6680cb 100644
--- a/src/librustc_lint/nonstandard_style.rs
+++ b/src/librustc_lint/nonstandard_style.rs
@@ -137,7 +137,7 @@ impl EarlyLintPass for NonCamelCaseTypes {
         }
 
         match it.node {
-            ast::ItemKind::Ty(..) |
+            ast::ItemKind::TyAlias(..) |
             ast::ItemKind::Enum(..) |
             ast::ItemKind::Struct(..) |
             ast::ItemKind::Union(..) => self.check_case(cx, "type", &it.ident),
diff --git a/src/librustc_metadata/encoder.rs b/src/librustc_metadata/encoder.rs
index 28252117dd2..d73a4966bca 100644
--- a/src/librustc_metadata/encoder.rs
+++ b/src/librustc_metadata/encoder.rs
@@ -980,7 +980,7 @@ impl EncodeContext<'tcx> {
                     needs_inline || is_const_fn || always_encode_mir
                 },
                 hir::ImplItemKind::OpaqueTy(..) |
-                hir::ImplItemKind::Type(..) => false,
+                hir::ImplItemKind::TyAlias(..) => false,
             };
 
         Entry {
@@ -1094,7 +1094,7 @@ impl EncodeContext<'tcx> {
             }
             hir::ItemKind::ForeignMod(_) => EntryKind::ForeignMod,
             hir::ItemKind::GlobalAsm(..) => EntryKind::GlobalAsm,
-            hir::ItemKind::Ty(..) => EntryKind::Type,
+            hir::ItemKind::TyAlias(..) => EntryKind::Type,
             hir::ItemKind::OpaqueTy(..) => EntryKind::OpaqueTy,
             hir::ItemKind::Enum(..) => EntryKind::Enum(get_repr_options(tcx, def_id)),
             hir::ItemKind::Struct(ref struct_def, _) => {
@@ -1227,7 +1227,7 @@ impl EncodeContext<'tcx> {
                 hir::ItemKind::Static(..) |
                 hir::ItemKind::Const(..) |
                 hir::ItemKind::Fn(..) |
-                hir::ItemKind::Ty(..) |
+                hir::ItemKind::TyAlias(..) |
                 hir::ItemKind::OpaqueTy(..) |
                 hir::ItemKind::Enum(..) |
                 hir::ItemKind::Struct(..) |
@@ -1247,7 +1247,7 @@ impl EncodeContext<'tcx> {
                 hir::ItemKind::Static(..) |
                 hir::ItemKind::Const(..) |
                 hir::ItemKind::Fn(..) |
-                hir::ItemKind::Ty(..) |
+                hir::ItemKind::TyAlias(..) |
                 hir::ItemKind::Enum(..) |
                 hir::ItemKind::Struct(..) |
                 hir::ItemKind::Union(..) |
@@ -1261,7 +1261,7 @@ impl EncodeContext<'tcx> {
                 hir::ItemKind::Static(..) |
                 hir::ItemKind::Const(..) |
                 hir::ItemKind::Fn(..) |
-                hir::ItemKind::Ty(..) |
+                hir::ItemKind::TyAlias(..) |
                 hir::ItemKind::Enum(..) |
                 hir::ItemKind::Struct(..) |
                 hir::ItemKind::Union(..) |
@@ -1761,7 +1761,7 @@ impl EncodeContext<'tcx> {
             hir::ItemKind::GlobalAsm(..) |
             hir::ItemKind::ExternCrate(..) |
             hir::ItemKind::Use(..) |
-            hir::ItemKind::Ty(..) |
+            hir::ItemKind::TyAlias(..) |
             hir::ItemKind::OpaqueTy(..) |
             hir::ItemKind::TraitAlias(..) => {
                 // no sub-item recording needed in these cases
diff --git a/src/librustc_mir/monomorphize/collector.rs b/src/librustc_mir/monomorphize/collector.rs
index b378dadce58..12d763bb791 100644
--- a/src/librustc_mir/monomorphize/collector.rs
+++ b/src/librustc_mir/monomorphize/collector.rs
@@ -969,7 +969,7 @@ impl ItemLikeVisitor<'v> for RootCollector<'_, 'v> {
             hir::ItemKind::ExternCrate(..) |
             hir::ItemKind::Use(..)         |
             hir::ItemKind::ForeignMod(..)  |
-            hir::ItemKind::Ty(..)          |
+            hir::ItemKind::TyAlias(..)          |
             hir::ItemKind::Trait(..)       |
             hir::ItemKind::TraitAlias(..)  |
             hir::ItemKind::OpaqueTy(..) |
diff --git a/src/librustc_passes/layout_test.rs b/src/librustc_passes/layout_test.rs
index 95cb8de7067..45a185dccf2 100644
--- a/src/librustc_passes/layout_test.rs
+++ b/src/librustc_passes/layout_test.rs
@@ -31,7 +31,7 @@ impl ItemLikeVisitor<'tcx> for VarianceTest<'tcx> {
     fn visit_item(&mut self, item: &'tcx hir::Item) {
         let item_def_id = self.tcx.hir().local_def_id(item.hir_id);
 
-        if let ItemKind::Ty(..) = item.node {
+        if let ItemKind::TyAlias(..) = item.node {
             for attr in self.tcx.get_attrs(item_def_id).iter() {
                 if attr.check_name(sym::rustc_layout) {
                     self.dump_layout_of(item_def_id, item, attr);
diff --git a/src/librustc_privacy/lib.rs b/src/librustc_privacy/lib.rs
index ac18f0e440b..4800bb9365c 100644
--- a/src/librustc_privacy/lib.rs
+++ b/src/librustc_privacy/lib.rs
@@ -534,7 +534,7 @@ impl Visitor<'tcx> for EmbargoVisitor<'tcx> {
             hir::ItemKind::Static(..) | hir::ItemKind::Struct(..) |
             hir::ItemKind::Trait(..) | hir::ItemKind::TraitAlias(..) |
             hir::ItemKind::OpaqueTy(..) |
-            hir::ItemKind::Ty(..) | hir::ItemKind::Union(..) | hir::ItemKind::Use(..) => {
+            hir::ItemKind::TyAlias(..) | hir::ItemKind::Union(..) | hir::ItemKind::Use(..) => {
                 if item.vis.node.is_pub() { self.prev_level } else { None }
             }
         };
@@ -589,7 +589,7 @@ impl Visitor<'tcx> for EmbargoVisitor<'tcx> {
             hir::ItemKind::Static(..) |
             hir::ItemKind::Const(..) |
             hir::ItemKind::GlobalAsm(..) |
-            hir::ItemKind::Ty(..) |
+            hir::ItemKind::TyAlias(..) |
             hir::ItemKind::Mod(..) |
             hir::ItemKind::TraitAlias(..) |
             hir::ItemKind::Fn(..) |
@@ -621,7 +621,7 @@ impl Visitor<'tcx> for EmbargoVisitor<'tcx> {
             }
             // Visit everything.
             hir::ItemKind::Const(..) | hir::ItemKind::Static(..) |
-            hir::ItemKind::Fn(..) | hir::ItemKind::Ty(..) => {
+            hir::ItemKind::Fn(..) | hir::ItemKind::TyAlias(..) => {
                 if item_level.is_some() {
                     self.reach(item.hir_id, item_level).generics().predicates().ty();
                 }
@@ -1371,7 +1371,7 @@ impl<'a, 'tcx> Visitor<'tcx> for ObsoleteVisiblePrivateTypesVisitor<'a, 'tcx> {
                                                 impl_item_ref.id.hir_id)
                                          }
                                          hir::ImplItemKind::OpaqueTy(..) |
-                                         hir::ImplItemKind::Type(_) => false,
+                                         hir::ImplItemKind::TyAlias(_) => false,
                                      }
                                  });
 
@@ -1397,7 +1397,7 @@ impl<'a, 'tcx> Visitor<'tcx> for ObsoleteVisiblePrivateTypesVisitor<'a, 'tcx> {
                                     {
                                         intravisit::walk_impl_item(self, impl_item)
                                     }
-                                    hir::ImplItemKind::Type(..) => {
+                                    hir::ImplItemKind::TyAlias(..) => {
                                         intravisit::walk_impl_item(self, impl_item)
                                     }
                                     _ => {}
@@ -1423,7 +1423,7 @@ impl<'a, 'tcx> Visitor<'tcx> for ObsoleteVisiblePrivateTypesVisitor<'a, 'tcx> {
                             // Those in 3. are warned with this call.
                             for impl_item_ref in impl_item_refs {
                                 let impl_item = self.tcx.hir().impl_item(impl_item_ref.id);
-                                if let hir::ImplItemKind::Type(ref ty) = impl_item.node {
+                                if let hir::ImplItemKind::TyAlias(ref ty) = impl_item.node {
                                     self.visit_ty(ty);
                                 }
                             }
@@ -1458,7 +1458,7 @@ impl<'a, 'tcx> Visitor<'tcx> for ObsoleteVisiblePrivateTypesVisitor<'a, 'tcx> {
 
             // `type ... = ...;` can contain private types, because
             // we're introducing a new name.
-            hir::ItemKind::Ty(..) => return,
+            hir::ItemKind::TyAlias(..) => return,
 
             // Not at all public, so we don't care.
             _ if !self.item_is_public(&item.hir_id, &item.vis) => {
@@ -1739,7 +1739,7 @@ impl<'a, 'tcx> Visitor<'tcx> for PrivateItemsInPublicInterfacesVisitor<'a, 'tcx>
             hir::ItemKind::GlobalAsm(..) => {}
             // Subitems of these items have inherited publicity.
             hir::ItemKind::Const(..) | hir::ItemKind::Static(..) |
-            hir::ItemKind::Fn(..) | hir::ItemKind::Ty(..) => {
+            hir::ItemKind::Fn(..) | hir::ItemKind::TyAlias(..) => {
                 self.check(item.hir_id, item_visibility).generics().predicates().ty();
             }
             hir::ItemKind::OpaqueTy(..) => {
diff --git a/src/librustc_resolve/build_reduced_graph.rs b/src/librustc_resolve/build_reduced_graph.rs
index b66cc9e57f7..9d01f330029 100644
--- a/src/librustc_resolve/build_reduced_graph.rs
+++ b/src/librustc_resolve/build_reduced_graph.rs
@@ -459,7 +459,7 @@ impl<'a> Resolver<'a> {
             }
 
             // These items live in the type namespace.
-            ItemKind::Ty(..) => {
+            ItemKind::TyAlias(..) => {
                 let res = Res::Def(DefKind::TyAlias, self.definitions.local_def_id(item.id));
                 self.define(parent, ident, TypeNS, (res, vis, sp, expansion));
             }
diff --git a/src/librustc_resolve/lib.rs b/src/librustc_resolve/lib.rs
index a49be7c27c9..a7062840a6f 100644
--- a/src/librustc_resolve/lib.rs
+++ b/src/librustc_resolve/lib.rs
@@ -2709,7 +2709,7 @@ impl<'a> Resolver<'a> {
         debug!("(resolving item) resolving {} ({:?})", name, item.node);
 
         match item.node {
-            ItemKind::Ty(_, ref generics) |
+            ItemKind::TyAlias(_, ref generics) |
             ItemKind::OpaqueTy(_, ref generics) |
             ItemKind::Fn(_, _, ref generics, _) => {
                 self.with_generic_param_rib(
@@ -3079,7 +3079,7 @@ impl<'a> Resolver<'a> {
 
                                                 visit::walk_impl_item(this, impl_item);
                                             }
-                                            ImplItemKind::Type(ref ty) => {
+                                            ImplItemKind::TyAlias(ref ty) => {
                                                 // If this is a trait impl, ensure the type
                                                 // exists in trait
                                                 this.check_trait_item(impl_item.ident,
diff --git a/src/librustc_save_analysis/dump_visitor.rs b/src/librustc_save_analysis/dump_visitor.rs
index 3abec9307ee..c32d4885c4a 100644
--- a/src/librustc_save_analysis/dump_visitor.rs
+++ b/src/librustc_save_analysis/dump_visitor.rs
@@ -1167,7 +1167,7 @@ impl<'l, 'tcx> DumpVisitor<'l, 'tcx> {
                     impl_item.span,
                 );
             }
-            ast::ImplItemKind::Type(ref ty) => {
+            ast::ImplItemKind::TyAlias(ref ty) => {
                 // FIXME: uses of the assoc type should ideally point to this
                 // 'def' and the name here should be a ref to the def in the
                 // trait.
@@ -1397,7 +1397,7 @@ impl<'l, 'tcx> Visitor<'l> for DumpVisitor<'l, 'tcx> {
                 self.process_mod(item);
                 visit::walk_mod(self, m);
             }
-            Ty(ref ty, ref ty_params) => {
+            TyAlias(ref ty, ref ty_params) => {
                 let qualname = format!("::{}",
                     self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id)));
                 let value = ty_to_string(&ty);
diff --git a/src/librustc_save_analysis/sig.rs b/src/librustc_save_analysis/sig.rs
index cbfaf91cdfc..c212cda2d66 100644
--- a/src/librustc_save_analysis/sig.rs
+++ b/src/librustc_save_analysis/sig.rs
@@ -438,7 +438,7 @@ impl Sig for ast::Item {
                     refs: vec![],
                 })
             }
-            ast::ItemKind::Ty(ref ty, ref generics) => {
+            ast::ItemKind::TyAlias(ref ty, ref generics) => {
                 let text = "type ".to_owned();
                 let mut sig = name_and_generics(text, offset, generics, self.id, self.ident, scx)?;
 
diff --git a/src/librustc_typeck/check/mod.rs b/src/librustc_typeck/check/mod.rs
index 8d6f9185962..e8ff83e7d2b 100644
--- a/src/librustc_typeck/check/mod.rs
+++ b/src/librustc_typeck/check/mod.rs
@@ -1409,7 +1409,7 @@ pub fn check_item_type<'tcx>(tcx: TyCtxt<'tcx>, it: &'tcx hir::Item) {
             let substs = InternalSubsts::identity_for_item(tcx, def_id);
             check_opaque(tcx, def_id, substs, it.span, &origin);
         }
-        hir::ItemKind::Ty(..) => {
+        hir::ItemKind::TyAlias(..) => {
             let def_id = tcx.hir().local_def_id(it.hir_id);
             let pty_ty = tcx.type_of(def_id);
             let generics = tcx.generics_of(def_id);
@@ -1543,7 +1543,7 @@ fn check_specialization_validity<'tcx>(
         hir::ImplItemKind::Const(..) => ty::AssocKind::Const,
         hir::ImplItemKind::Method(..) => ty::AssocKind::Method,
         hir::ImplItemKind::OpaqueTy(..) => ty::AssocKind::OpaqueTy,
-        hir::ImplItemKind::Type(_) => ty::AssocKind::Type
+        hir::ImplItemKind::TyAlias(_) => ty::AssocKind::Type,
     };
 
     let parent = ancestors.defs(tcx, trait_item.ident, kind, trait_def.def_id).nth(1)
@@ -1640,7 +1640,7 @@ fn check_impl_items_against_trait<'tcx>(
                     }
                 }
                 hir::ImplItemKind::OpaqueTy(..) |
-                hir::ImplItemKind::Type(_) => {
+                hir::ImplItemKind::TyAlias(_) => {
                     if ty_trait_item.kind == ty::AssocKind::Type {
                         if ty_trait_item.defaultness.has_value() {
                             overridden_associated_type = Some(impl_item);
diff --git a/src/librustc_typeck/collect.rs b/src/librustc_typeck/collect.rs
index 15687eaa943..a14040fe59a 100644
--- a/src/librustc_typeck/collect.rs
+++ b/src/librustc_typeck/collect.rs
@@ -293,7 +293,7 @@ fn type_param_predicates(
             match item.node {
                 ItemKind::Fn(.., ref generics, _)
                 | ItemKind::Impl(_, _, _, ref generics, ..)
-                | ItemKind::Ty(_, ref generics)
+                | ItemKind::TyAlias(_, ref generics)
                 | ItemKind::OpaqueTy(OpaqueTy {
                     ref generics,
                     impl_trait_fn: None,
@@ -462,7 +462,7 @@ fn convert_item(tcx: TyCtxt<'_>, item_id: hir::HirId) {
         }) => {}
 
         hir::ItemKind::OpaqueTy(..)
-        | hir::ItemKind::Ty(..)
+        | hir::ItemKind::TyAlias(..)
         | hir::ItemKind::Static(..)
         | hir::ItemKind::Const(..)
         | hir::ItemKind::Fn(..) => {
@@ -917,7 +917,7 @@ fn generics_of(tcx: TyCtxt<'_>, def_id: DefId) -> &ty::Generics {
                     generics
                 }
 
-                ItemKind::Ty(_, ref generics)
+                ItemKind::TyAlias(_, ref generics)
                 | ItemKind::Enum(_, ref generics)
                 | ItemKind::Struct(_, ref generics)
                 | ItemKind::OpaqueTy(hir::OpaqueTy { ref generics, .. })
@@ -1220,7 +1220,7 @@ pub fn checked_type_of(tcx: TyCtxt<'_>, def_id: DefId, fail: bool) -> Option<Ty<
 
                 find_opaque_ty_constraints(tcx, def_id)
             }
-            ImplItemKind::Type(ref ty) => {
+            ImplItemKind::TyAlias(ref ty) => {
                 if tcx
                     .impl_trait_ref(tcx.hir().get_parent_did(hir_id))
                     .is_none()
@@ -1242,7 +1242,7 @@ pub fn checked_type_of(tcx: TyCtxt<'_>, def_id: DefId, fail: bool) -> Option<Ty<
                         icx.to_ty(ty)
                     }
                 },
-                ItemKind::Ty(ref ty, _)
+                ItemKind::TyAlias(ref ty, _)
                 | ItemKind::Impl(.., ref ty, _) => icx.to_ty(ty),
                 ItemKind::Fn(..) => {
                     let substs = InternalSubsts::identity_for_item(tcx, def_id);
@@ -2038,7 +2038,7 @@ fn explicit_predicates_of(
                     generics
                 }
                 ItemKind::Fn(.., ref generics, _)
-                | ItemKind::Ty(_, ref generics)
+                | ItemKind::TyAlias(_, ref generics)
                 | ItemKind::Enum(_, ref generics)
                 | ItemKind::Struct(_, ref generics)
                 | ItemKind::Union(_, ref generics) => generics,
diff --git a/src/librustc_typeck/impl_wf_check.rs b/src/librustc_typeck/impl_wf_check.rs
index 029a8f9c41f..fcfd9adef54 100644
--- a/src/librustc_typeck/impl_wf_check.rs
+++ b/src/librustc_typeck/impl_wf_check.rs
@@ -189,7 +189,7 @@ fn enforce_impl_items_are_distinct(tcx: TyCtxt<'_>, impl_item_refs: &[hir::ImplI
     for impl_item_ref in impl_item_refs {
         let impl_item = tcx.hir().impl_item(impl_item_ref.id);
         let seen_items = match impl_item.node {
-            hir::ImplItemKind::Type(_) => &mut seen_type_items,
+            hir::ImplItemKind::TyAlias(_) => &mut seen_type_items,
             _                          => &mut seen_value_items,
         };
         match seen_items.entry(impl_item.ident.modern()) {
diff --git a/src/librustc_typeck/namespace.rs b/src/librustc_typeck/namespace.rs
index 732f0d3ebf2..1e1d3e7865c 100644
--- a/src/librustc_typeck/namespace.rs
+++ b/src/librustc_typeck/namespace.rs
@@ -23,7 +23,7 @@ impl<'a> From <&'a hir::ImplItemKind> for Namespace {
     fn from(impl_kind: &'a hir::ImplItemKind) -> Self {
         match *impl_kind {
             hir::ImplItemKind::OpaqueTy(..) |
-            hir::ImplItemKind::Type(..) => Namespace::Type,
+            hir::ImplItemKind::TyAlias(..) => Namespace::Type,
             hir::ImplItemKind::Const(..) |
             hir::ImplItemKind::Method(..) => Namespace::Value,
         }
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index a7fb18c3f2c..d3accff5c2c 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -2253,7 +2253,7 @@ impl Clean<Item> for hir::ImplItem {
             hir::ImplItemKind::Method(ref sig, body) => {
                 MethodItem((sig, &self.generics, body, Some(self.defaultness)).clean(cx))
             }
-            hir::ImplItemKind::Type(ref ty) => TypedefItem(Typedef {
+            hir::ImplItemKind::TyAlias(ref ty) => TypedefItem(Typedef {
                 type_: ty.clean(cx),
                 generics: Generics::default(),
             }, true),
@@ -2802,7 +2802,7 @@ impl Clean<Type> for hir::Ty {
                     }
                 };
 
-                if let Some(&hir::ItemKind::Ty(ref ty, ref generics)) = alias {
+                if let Some(&hir::ItemKind::TyAlias(ref ty, ref generics)) = alias {
                     let provided_params = &path.segments.last().expect("segments were empty");
                     let mut ty_substs = FxHashMap::default();
                     let mut lt_substs = FxHashMap::default();
diff --git a/src/librustdoc/visit_ast.rs b/src/librustdoc/visit_ast.rs
index 098cecef95c..1ba2c0333d6 100644
--- a/src/librustdoc/visit_ast.rs
+++ b/src/librustdoc/visit_ast.rs
@@ -458,7 +458,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
                 om.unions.push(self.visit_union_data(item, ident.name, sd, gen)),
             hir::ItemKind::Fn(ref fd, header, ref gen, body) =>
                 self.visit_fn(om, item, ident.name, &**fd, header, gen, body),
-            hir::ItemKind::Ty(ref ty, ref gen) => {
+            hir::ItemKind::TyAlias(ref ty, ref gen) => {
                 let t = Typedef {
                     ty,
                     gen,
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index ea8fa023855..849e77c4f31 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -1509,7 +1509,7 @@ pub struct ImplItem {
 pub enum ImplItemKind {
     Const(P<Ty>, P<Expr>),
     Method(MethodSig, P<Block>),
-    Type(P<Ty>),
+    TyAlias(P<Ty>),
     OpaqueTy(GenericBounds),
     Macro(Mac),
 }
@@ -2346,7 +2346,7 @@ pub enum ItemKind {
     /// A type alias (`type` or `pub type`).
     ///
     /// E.g., `type Foo = Bar<u8>;`.
-    Ty(P<Ty>, Generics),
+    TyAlias(P<Ty>, Generics),
     /// An opaque `impl Trait` type alias.
     ///
     /// E.g., `type Foo = impl Bar + Boo;`.
@@ -2403,7 +2403,7 @@ impl ItemKind {
             ItemKind::Mod(..) => "module",
             ItemKind::ForeignMod(..) => "foreign module",
             ItemKind::GlobalAsm(..) => "global asm",
-            ItemKind::Ty(..) => "type alias",
+            ItemKind::TyAlias(..) => "type alias",
             ItemKind::OpaqueTy(..) => "opaque type",
             ItemKind::Enum(..) => "enum",
             ItemKind::Struct(..) => "struct",
diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index b4b15ba31b7..59e13fdc8f1 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -858,7 +858,7 @@ impl<'a> ExtCtxt<'a> {
 
     pub fn item_ty_poly(&self, span: Span, name: Ident, ty: P<ast::Ty>,
                     generics: Generics) -> P<ast::Item> {
-        self.item(span, name, Vec::new(), ast::ItemKind::Ty(ty, generics))
+        self.item(span, name, Vec::new(), ast::ItemKind::TyAlias(ty, generics))
     }
 
     pub fn item_ty(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> P<ast::Item> {
diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 33d10b269e1..76ea8e607b7 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -2254,7 +2254,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
                     "`impl Trait` in type aliases is unstable"
                 );
             }
-            ast::ImplItemKind::Type(_) => {
+            ast::ImplItemKind::TyAlias(_) => {
                 if !ii.generics.params.is_empty() {
                     gate_feature_post!(&self, generic_associated_types, ii.span,
                                        "generic associated types are unstable");
diff --git a/src/libsyntax/mut_visit.rs b/src/libsyntax/mut_visit.rs
index cbad74e1561..be04c6a76b0 100644
--- a/src/libsyntax/mut_visit.rs
+++ b/src/libsyntax/mut_visit.rs
@@ -847,7 +847,7 @@ pub fn noop_visit_item_kind<T: MutVisitor>(kind: &mut ItemKind, vis: &mut T) {
         ItemKind::Mod(m) => vis.visit_mod(m),
         ItemKind::ForeignMod(nm) => vis.visit_foreign_mod(nm),
         ItemKind::GlobalAsm(_ga) => {}
-        ItemKind::Ty(ty, generics) => {
+        ItemKind::TyAlias(ty, generics) => {
             vis.visit_ty(ty);
             vis.visit_generics(generics);
         }
@@ -933,7 +933,7 @@ pub fn noop_flat_map_impl_item<T: MutVisitor>(mut item: ImplItem, visitor: &mut
             visit_method_sig(sig, visitor);
             visitor.visit_block(body);
         }
-        ImplItemKind::Type(ty) => visitor.visit_ty(ty),
+        ImplItemKind::TyAlias(ty) => visitor.visit_ty(ty),
         ImplItemKind::OpaqueTy(bounds) => visit_bounds(bounds, visitor),
         ImplItemKind::Macro(mac) => visitor.visit_mac(mac),
     }
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index b14000aeaf3..d85c2df16a3 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -5707,7 +5707,7 @@ impl<'a> Parser<'a> {
         let (name, node, generics) = if let Some(type_) = self.eat_type() {
             let (name, alias, generics) = type_?;
             let kind = match alias {
-                AliasKind::Weak(typ) => ast::ImplItemKind::Type(typ),
+                AliasKind::Weak(typ) => ast::ImplItemKind::TyAlias(typ),
                 AliasKind::OpaqueTy(bounds) => ast::ImplItemKind::OpaqueTy(bounds),
             };
             (name, kind, generics)
@@ -7263,7 +7263,7 @@ impl<'a> Parser<'a> {
             let (ident, alias, generics) = type_?;
             // TYPE ITEM
             let item_ = match alias {
-                AliasKind::Weak(ty) => ItemKind::Ty(ty, generics),
+                AliasKind::Weak(ty) => ItemKind::TyAlias(ty, generics),
                 AliasKind::OpaqueTy(bounds) => ItemKind::OpaqueTy(bounds, generics),
             };
             let prev_span = self.prev_span;
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index f3989be45dd..2ef8a919b9c 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -1208,7 +1208,7 @@ impl<'a> State<'a> {
                 self.s.word(ga.asm.as_str().to_string());
                 self.end();
             }
-            ast::ItemKind::Ty(ref ty, ref generics) => {
+            ast::ItemKind::TyAlias(ref ty, ref generics) => {
                 self.head(visibility_qualified(&item.vis, "type"));
                 self.print_ident(item.ident);
                 self.print_generic_params(&generics.params);
@@ -1579,7 +1579,7 @@ impl<'a> State<'a> {
                 self.nbsp();
                 self.print_block_with_attrs(body, &ii.attrs);
             }
-            ast::ImplItemKind::Type(ref ty) => {
+            ast::ImplItemKind::TyAlias(ref ty) => {
                 self.print_associated_type(ii.ident, None, Some(ty));
             }
             ast::ImplItemKind::OpaqueTy(ref bounds) => {
diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs
index 67226c2177f..596c5b46b98 100644
--- a/src/libsyntax/visit.rs
+++ b/src/libsyntax/visit.rs
@@ -255,7 +255,7 @@ pub fn walk_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a Item) {
             walk_list!(visitor, visit_foreign_item, &foreign_module.items);
         }
         ItemKind::GlobalAsm(ref ga) => visitor.visit_global_asm(ga),
-        ItemKind::Ty(ref typ, ref generics) => {
+        ItemKind::TyAlias(ref typ, ref generics) => {
             visitor.visit_ty(typ);
             visitor.visit_generics(generics)
         }
@@ -616,7 +616,7 @@ pub fn walk_impl_item<'a, V: Visitor<'a>>(visitor: &mut V, impl_item: &'a ImplIt
             visitor.visit_fn(FnKind::Method(impl_item.ident, sig, Some(&impl_item.vis), body),
                              &sig.decl, impl_item.span, impl_item.id);
         }
-        ImplItemKind::Type(ref ty) => {
+        ImplItemKind::TyAlias(ref ty) => {
             visitor.visit_ty(ty);
         }
         ImplItemKind::OpaqueTy(ref bounds) => {
diff --git a/src/libsyntax_ext/deriving/generic/mod.rs b/src/libsyntax_ext/deriving/generic/mod.rs
index 4a0c4a39f78..cb89a68b9f2 100644
--- a/src/libsyntax_ext/deriving/generic/mod.rs
+++ b/src/libsyntax_ext/deriving/generic/mod.rs
@@ -529,7 +529,8 @@ impl<'a> TraitDef<'a> {
                 defaultness: ast::Defaultness::Final,
                 attrs: Vec::new(),
                 generics: Generics::default(),
-                node: ast::ImplItemKind::Type(type_def.to_ty(cx, self.span, type_ident, generics)),
+                node: ast::ImplItemKind::TyAlias(
+                    type_def.to_ty(cx, self.span, type_ident, generics)),
                 tokens: None,
             }
         });