Change to add 1 if non zero shift

2019-11-05 01:16:06 +08:00 · 2019-11-05 01:16:06 +08:00 · a5839662f4
commit a5839662f4
parent 188a1412b9
1 changed files with 1 additions and 1 deletions
--- 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 })
    }