Box ExprKind::{Closure,MethodCall}, and QSelf in expressions, types, and patterns.

compiler/rustc_resolve/src/def_collector.rs

@@ -262,11 +262,11 @@ impl<'a, 'b> visit::Visitor<'a> for DefCollector<'a, 'b> {
     fn visit_expr(&mut self, expr: &'a Expr) {
         let parent_def = match expr.kind {
             ExprKind::MacCall(..) => return self.visit_macro_invoc(expr.id),
-            ExprKind::Closure(_, _, asyncness, ..) => {
+            ExprKind::Closure(ref closure) => {
                 // Async closures desugar to closures inside of closures, so
                 // we must create two defs.
                 let closure_def = self.create_def(expr.id, DefPathData::ClosureExpr, expr.span);
-                match asyncness {
+                match closure.asyncness {
                     Async::Yes { closure_id, .. } => {
                         self.create_def(closure_id, DefPathData::ClosureExpr, expr.span)
                     }