save compiling state during refactor

rust/src/util.rs

@@ -1,10 +1,10 @@
 
 pub trait LimitPrecision {
-    fn to_precision(self, presision: i32) -> self;
+    fn to_precision(self, presision: i32) -> Self;
 }
 
 impl LimitPrecision for f32 {
-    fn to_precision(self, precision: i32) -> self {
+    fn to_precision(self, precision: i32) -> Self {
         (self * (10_f32).powi(precision)).round() / (10_f32).powi(precision)
     }
 }