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-rw-r--r--crates/ra_mbe/src/lib.rs2
1 files changed, 1 insertions, 1 deletions
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 {
108 108
109 // Note that TokenId is started from zero, 109 // Note that TokenId is started from zero,
110 // We have to add 1 to prevent duplication. 110 // We have to add 1 to prevent duplication.
111 let shift = max_id(tt).unwrap_or(0) + 1; 111 let shift = max_id(tt).map_or(0, |it| it + 1);
112 Ok(MacroRules { rules, shift }) 112 Ok(MacroRules { rules, shift })
113 } 113 }
114 114