Fix examples

src/librustc_typeck/error_codes.rs

@@ -3797,22 +3797,34 @@ E0592: r##"
 This error occurs when you defined methods or associated functions with same
 name.
 
-For example, in the following code:
+Erroneous code example:
 
 ```compile_fail,E0592
 struct Foo;
 
+impl Foo {
+    fn bar() {} // previous definition here
+}
+
+impl Foo {
+    fn bar() {} // duplicate definition here
+}
+```
+
+A similar error is E0201. The difference is whether there is one declaration
+block or not. To avoid this error, you have to give them one name each.
+
+```
+struct Foo;
+
 impl Foo {
     fn bar() {}
 }
 
 impl Foo {
-    fn bar() {}
+    fn baz() {} // define with different name
 }
 ```
-
-A similar error is E0201. The difference is whether there is one declaration
-block or not. To avoid this error, you have to give them one name each.
 "##,
 
 E0599: r##"