From 6c47848c2553ea2703ef12e1e767cf583ff390c6 Mon Sep 17 00:00:00 2001
From: Nilstrieb <48135649+Nilstrieb@users.noreply.github.com>
Date: Thu, 27 Oct 2022 21:43:48 +0200
Subject: [PATCH] Small parser cleanups

---
 compiler/rustc_expand/src/mbe/macro_parser.rs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/compiler/rustc_expand/src/mbe/macro_parser.rs b/compiler/rustc_expand/src/mbe/macro_parser.rs
index aa7a06f66d72..6513928e78c8 100644
--- a/compiler/rustc_expand/src/mbe/macro_parser.rs
+++ b/compiler/rustc_expand/src/mbe/macro_parser.rs
@@ -451,7 +451,7 @@ impl TtParser {
                         // Try zero matches of this sequence, by skipping over it.
                         self.cur_mps.push(MatcherPos {
                             idx: idx_first_after,
-                            matches: mp.matches.clone(), // a cheap clone
+                            matches: Lrc::clone(&mp.matches),
                         });
                     }
 
@@ -464,8 +464,8 @@ impl TtParser {
                     // sequence. If that's not possible, `ending_mp` will fail quietly when it is
                     // processed next time around the loop.
                     let ending_mp = MatcherPos {
-                        idx: mp.idx + 1,             // +1 skips the Kleene op
-                        matches: mp.matches.clone(), // a cheap clone
+                        idx: mp.idx + 1, // +1 skips the Kleene op
+                        matches: Lrc::clone(&mp.matches),
                     };
                     self.cur_mps.push(ending_mp);
 
@@ -480,8 +480,8 @@ impl TtParser {
                     // separator yet. Try ending the sequence. If that's not possible, `ending_mp`
                     // will fail quietly when it is processed next time around the loop.
                     let ending_mp = MatcherPos {
-                        idx: mp.idx + 2,             // +2 skips the separator and the Kleene op
-                        matches: mp.matches.clone(), // a cheap clone
+                        idx: mp.idx + 2, // +2 skips the separator and the Kleene op
+                        matches: Lrc::clone(&mp.matches),
                     };
                     self.cur_mps.push(ending_mp);