Add an indirection for closures in hir::ExprKind

This helps bring `hir::Expr` size down, `Closure` was the biggest
variant, especially after `for<>` additions.

compiler/rustc_hir/src/arena.rs

@@ -12,6 +12,7 @@ macro_rules! arena_types {
             [] 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>,

compiler/rustc_hir/src/hir.rs

@@ -922,6 +922,17 @@ pub struct Crate<'hir> {
     pub hir_hash: Fingerprint,
 }
 
+#[derive(Debug, HashStable_Generic)]
+pub struct Closure<'hir> {
+    pub binder: ClosureBinder,
+    pub capture_clause: CaptureBy,
+    pub bound_generic_params: &'hir [GenericParam<'hir>],
+    pub fn_decl: &'hir FnDecl<'hir>,
+    pub body: BodyId,
+    pub fn_decl_span: Span,
+    pub movability: Option<Movability>,
+}
+
 /// A block of statements `{ .. }`, which may have a label (in this case the
 /// `targeted_by_break` field will be `true`) and may be `unsafe` by means of
 /// the `rules` being anything but `DefaultBlock`.
@@ -1930,15 +1941,7 @@ pub enum ExprKind<'hir> {
     ///
     /// This may also be a generator literal or an `async block` as indicated by the
     /// `Option<Movability>`.
-    Closure {
-        binder: &'hir ClosureBinder,
-        capture_clause: CaptureBy,
-        bound_generic_params: &'hir [GenericParam<'hir>],
-        fn_decl: &'hir FnDecl<'hir>,
-        body: BodyId,
-        fn_decl_span: Span,
-        movability: Option<Movability>,
-    },
+    Closure(&'hir Closure<'hir>),
     /// A block (e.g., `'label: { ... }`).
     Block(&'hir Block<'hir>, Option<Label>),
 

compiler/rustc_hir/src/intravisit.rs

@@ -1144,23 +1144,17 @@ pub fn walk_expr<'v, V: Visitor<'v>>(visitor: &mut V, expression: &'v Expr<'v>)
             visitor.visit_expr(subexpression);
             walk_list!(visitor, visit_arm, arms);
         }
-        ExprKind::Closure {
+        ExprKind::Closure(&Closure {
             binder: _,
             bound_generic_params,
-            ref fn_decl,
+            fn_decl,
             body,
             capture_clause: _,
             fn_decl_span: _,
             movability: _,
-        } => {
+        }) => {
             walk_list!(visitor, visit_generic_param, bound_generic_params);
-            visitor.visit_fn(
-                FnKind::Closure,
-                fn_decl,
-                body,
-                expression.span,
-                expression.hir_id,
-            )
+            visitor.visit_fn(FnKind::Closure, fn_decl, body, expression.span, expression.hir_id)
         }
         ExprKind::Block(ref block, ref opt_label) => {
             walk_list!(visitor, visit_label, opt_label);