diff -r 13041ae61ac5 -r 387345a14b3f rust/hedgewars-server/src/handlers.rs
--- a/rust/hedgewars-server/src/handlers.rs	Fri Jul 05 21:48:01 2019 +0300
+++ b/rust/hedgewars-server/src/handlers.rs	Fri Jul 05 23:40:03 2019 +0300
@@ -59,9 +59,9 @@
             #[inline]
             fn convert(c: u8) -> u8 {
                 if c > b'9' {
-                    c.overflowing_sub(b'a').0.saturating_add(10)
+                    c.wrapping_sub(b'a').saturating_add(10)
                 } else {
-                    c.overflowing_sub(b'0').0
+                    c.wrapping_sub(b'0')
                 }
             }