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+use-returnValue
+===============
+
+Warn when idempotent methods are called and their return value is unused.
+
+Examples of incorrect code for this rule:
+-----------------------------------------
+
+.. code-block:: js
+
+ foo.concat(bar)
+ baz.concat()
+
+Examples of correct code for this rule:
+---------------------------------------
+
+.. code-block:: js
+
+ a = foo.concat(bar)
+ b = baz.concat()