From 65622e319e21d95bb7275109aecacb8e2526ce04 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Wed, 20 Feb 2019 10:10:11 +0300
Subject: [PATCH] cleanup macro after 2018 transition

We can now use `?`
---
 src/libsyntax/ext/expand.rs | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index d398437d7af..f50663f9785 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -36,10 +36,8 @@ macro_rules! ast_fragments {
     (
         $($Kind:ident($AstTy:ty) {
             $kind_name:expr;
-            // FIXME: HACK: this should be `$(one ...)?` and `$(many ...)?` but `?` macro
-            // repetition was removed from 2015 edition in #51587 because of ambiguities.
-            $(one fn $mut_visit_ast:ident; fn $visit_ast:ident;)*
-            $(many fn $flat_map_ast_elt:ident; fn $visit_ast_elt:ident;)*
+            $(one fn $mut_visit_ast:ident; fn $visit_ast:ident;)?
+            $(many fn $flat_map_ast_elt:ident; fn $visit_ast_elt:ident;)?
             fn $make_ast:ident;
         })*
     ) => {