1 files changed, 55 insertions, 0 deletions
diff --git a/compiler/rustc_hir/src/arena.rs b/compiler/rustc_hir/src/arena.rs
new file mode 100644
index 000000000..44335b7f4
--- /dev/null
+++ b/compiler/rustc_hir/src/arena.rs
@@ -0,0 +1,55 @@
+/// This higher-order macro declares a list of types which can be allocated by `Arena`.
+///
+/// Specifying the `decode` modifier will add decode impls for `&T` and `&[T]`,
+/// where `T` is the type listed. These impls will appear in the implement_ty_decoder! macro.
+#[macro_export]
+macro_rules! arena_types {
+    ($macro:path) => (
+        $macro!([
+            // HIR types
+            [] hir_krate: rustc_hir::Crate<'tcx>,
+            [] arm: rustc_hir::Arm<'tcx>,
+            [] asm_operand: (rustc_hir::InlineAsmOperand<'tcx>, rustc_span::Span),
+            [] asm_template: rustc_ast::InlineAsmTemplatePiece,
+            [] attribute: rustc_ast::Attribute,
+            [] closure: rustc_hir::Closure<'tcx>,
+            [] block: rustc_hir::Block<'tcx>,
+            [] bare_fn_ty: rustc_hir::BareFnTy<'tcx>,
+            [] body: rustc_hir::Body<'tcx>,
+            [] generics: rustc_hir::Generics<'tcx>,
+            [] generic_arg: rustc_hir::GenericArg<'tcx>,
+            [] generic_args: rustc_hir::GenericArgs<'tcx>,
+            [] generic_bound: rustc_hir::GenericBound<'tcx>,
+            [] generic_param: rustc_hir::GenericParam<'tcx>,
+            [] expr: rustc_hir::Expr<'tcx>,
+            [] impl_: rustc_hir::Impl<'tcx>,
+            [] let_expr: rustc_hir::Let<'tcx>,
+            [] expr_field: rustc_hir::ExprField<'tcx>,
+            [] pat_field: rustc_hir::PatField<'tcx>,
+            [] fn_decl: rustc_hir::FnDecl<'tcx>,
+            [] foreign_item: rustc_hir::ForeignItem<'tcx>,
+            [] foreign_item_ref: rustc_hir::ForeignItemRef,
+            [] impl_item: rustc_hir::ImplItem<'tcx>,
+            [] impl_item_ref: rustc_hir::ImplItemRef,
+            [] item: rustc_hir::Item<'tcx>,
+            [] inline_asm: rustc_hir::InlineAsm<'tcx>,
+            [] local: rustc_hir::Local<'tcx>,
+            [] mod_: rustc_hir::Mod<'tcx>,
+            [] owner_info: rustc_hir::OwnerInfo<'tcx>,
+            [] param: rustc_hir::Param<'tcx>,
+            [] pat: rustc_hir::Pat<'tcx>,
+            [] path: rustc_hir::Path<'tcx>,
+            [] path_segment: rustc_hir::PathSegment<'tcx>,
+            [] poly_trait_ref: rustc_hir::PolyTraitRef<'tcx>,
+            [] qpath: rustc_hir::QPath<'tcx>,
+            [] stmt: rustc_hir::Stmt<'tcx>,
+            [] field_def: rustc_hir::FieldDef<'tcx>,
+            [] trait_item: rustc_hir::TraitItem<'tcx>,
+            [] trait_item_ref: rustc_hir::TraitItemRef,
+            [] ty: rustc_hir::Ty<'tcx>,
+            [] type_binding: rustc_hir::TypeBinding<'tcx>,
+            [] variant: rustc_hir::Variant<'tcx>,
+            [] where_predicate: rustc_hir::WherePredicate<'tcx>,
+        ]);
+    )
+}