Update rule.adoc

rules/S7458/rust/rule.adoc

@@ -1,44 +1,46 @@
-FIXME: add a description
-
-// If you want to factorize the description uncomment the following line and create the file.
-//include::../description.adoc[]
 
 == Why is this an issue?
+Defining an inherent `to_string(&self)` method on a type that also implements the `Display` trait can lead to confusion, as this inherent method will overshadow the `to_string` method automatically provided by the `Display` trait. The inherent method is less versatile, preventing proper use of the `Display` trait's feature.
 
-FIXME: remove the unused optional headers (that are commented out)
-
-//=== What is the potential impact?
-
-== How to fix it
-//== How to fix it in FRAMEWORK NAME
 
 === Code examples
 
 ==== Noncompliant code example
-
 [source,rust,diff-id=1,diff-type=noncompliant]
 ----
-FIXME
+use std::fmt;
+
+pub struct A;
+
+impl A {
+    pub fn to_string(&self) -> String {
+        "I am A".to_string() // Noncompliant: Inherent method shadows `Display::to_string`.
+    }
+}
+
+impl fmt::Display for A {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "I am A, too")
+    }
+}
 ----
 
 ==== Compliant solution
 
 [source,rust,diff-id=1,diff-type=compliant]
 ----
-FIXME
+use std::fmt;
+
+pub struct A;
+
+impl fmt::Display for A {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "I am A")
+    }
+}
 ----
 
-//=== How does this work?
+== Resources
+=== Documentation
 
-//=== Pitfalls
-
-//=== Going the extra mile
-
-
-//== Resources
-//=== Documentation
-//=== Articles & blog posts
-//=== Conference presentations
-//=== Standards
-//=== External coding guidelines
-//=== Benchmarks
+* Clippy Lints - https://rust-lang.github.io/rust-clippy/master/index.html#inherent_to_string_shadow_display