refactor: make Operator/Function ordering consistent

src/nodes/eval.rs

@@ -127,6 +127,17 @@ fn collapse_toplevel(nodes: &mut Vec<Node>, mut end: usize) -> Result<(), Error>
     Ok(())
 }
 
+impl Operator {
+    fn apply_to(&self, rhs: &mut Float, lhs: Float) {
+        match self {
+            Self::Plus => Float::add_from(rhs, lhs),
+            Self::Minus => Float::sub_from(rhs, lhs),
+            Self::Mult => Float::mul_from(rhs, lhs),
+            Self::Div => Float::div_from(rhs, lhs),
+            Self::Exp => Float::pow_from(rhs, lhs),
+        }
+    }
+}
 impl Function {
     fn apply_to(&self, n: &mut Float) {
         match self {
@@ -145,17 +156,6 @@ impl Function {
         }
     }
 }
-impl Operator {
-    fn apply_to(&self, rhs: &mut Float, lhs: Float) {
-        match self {
-            Self::Plus => Float::add_from(rhs, lhs),
-            Self::Minus => Float::sub_from(rhs, lhs),
-            Self::Mult => Float::mul_from(rhs, lhs),
-            Self::Div => Float::div_from(rhs, lhs),
-            Self::Exp => Float::pow_from(rhs, lhs),
-        }
-    }
-}
 
 #[cfg(test)]
 mod tests {