Rule S2114: Collections should not be passed as arguments to their own methods

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Passing a collection as an argument to the collection's own method is either an error - some other argument was intended - or simply nonsensical code.
Further, because some methods require that the argument remain unmodified during the execution, passing a collection to itself can result in undefined behavior.

Code Example

var myList = new List<int>();

myList.AddRange(myList); // Noncompliant
myList.Concat(myList); // Noncompliant

myList.Union(myList); // Noncompliant; always returns myList
myList.Except(myList); // Noncompliant; always empty
myList.Intersect(myList); // Noncompliant; always myList
myList.SequenceEqual(myList); // Noncompliant; always true

var set = new HashSet<int>();
set.UnionWith(set); // Noncompliant; no changes
set.ExceptWith(set); // Noncompliant; use Clear instead

Implements RSPEC-2114