...

src/result.rs

@@ -4,7 +4,7 @@ use std::fmt::{Debug, Display, Formatter};
 #[derive(Debug)]
 pub struct Error<T> {
     message: String,
-    pub target: T,
+    target: T,
 }
 
 impl<T> Error<T> {
@@ -14,6 +14,10 @@ impl<T> Error<T> {
             target,
         }
     }
+
+    pub fn into_target(self) -> T {
+        self.target
+    }
 }
 
 impl<T> Display for Error<T> {

src/rule/composer/not.rs

@@ -26,7 +26,7 @@ where
     fn validate(target: Self::Item) -> Result<Self::Item, Error<Self::Item>> {
         let bounded_rule = move |t: T| match RULE::validate(t) {
             Ok(t) => Err(Error::new("Target satisfies the rule", t)),
-            Err(e) => Ok(e.target),
+            Err(e) => Ok(e.into_target()),
         };
         bounded_rule(target)
     }

src/rule/composer/or.rs

@@ -27,7 +27,8 @@ where
     type Item = T;
 
     fn validate(target: Self::Item) -> Result<Self::Item, Error<Self::Item>> {
-        let bounded_rule = move |t: T| RULE1::validate(t).or_else(|e| RULE2::validate(e.target));
+        let bounded_rule =
+            move |t: T| RULE1::validate(t).or_else(|e| RULE2::validate(e.into_target()));
         bounded_rule(target)
     }
 }