== Why is this an issue?

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. 

=== Noncompliant code example

[source,java]
----
List <Object> objs = new ArrayList<Object>();
objs.add("Hello");

objs.add(objs); // Noncompliant; StackOverflowException if objs.hashCode() called
objs.addAll(objs); // Noncompliant; behavior undefined
objs.containsAll(objs); // Noncompliant; always true
objs.removeAll(objs); // Noncompliant; confusing. Use clear() instead
objs.retainAll(objs); // Noncompliant; NOOP
----

ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

=== Message

Remove or correct this "xxx" call.

'''
== Comments And Links
(visible only on this page)

include::../comments-and-links.adoc[]

endif::env-github,rspecator-view[]