From a5839662f448602d6aa2d724432844fc2d08947e Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Tue, 5 Nov 2019 01:16:06 +0800
Subject: Change to  add 1 if non zero shift

---
 crates/ra_mbe/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'crates/ra_mbe/src')

diff --git a/crates/ra_mbe/src/lib.rs b/crates/ra_mbe/src/lib.rs
index b92312d52..15f000175 100644
--- a/crates/ra_mbe/src/lib.rs
+++ b/crates/ra_mbe/src/lib.rs
@@ -108,7 +108,7 @@ impl MacroRules {
 
         // Note that TokenId is started from zero,
         // We have to add 1 to prevent duplication.
-        let shift = max_id(tt).unwrap_or(0) + 1;
+        let shift = max_id(tt).map_or(0, |it| it + 1);
         Ok(MacroRules { rules, shift })
     }
 
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