== Why is this an issue?

The requirement for a final ``++case _++`` clause is defensive programming. The clause should either take appropriate action, or contain a suitable comment as to why no action is taken.

=== Noncompliant code example

[source,scala]
----
param match {
  case 1 => doSomething
  case 2 => doSomethingElse
}
----

=== Compliant solution

[source,scala]
----
param match {
  case 1 => doSomething
  case 2 => doSomethingElse
  case _ => throw new IllegalArgumentException(s"Unexpected param: $param")
}
----

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== Implementation Specification
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== Comments And Links
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