Duplicate case in pattern-matching SC-W1007

Duplicate cases in pattern matching are unreachable and are usually the result of human error. Because such cases are unreachable, they have the potential to affect the overall control-flow and the behaviour of the program. It is suggested that you remove such duplicate cases.

Bad Practice

someVar match {
  case foo => ...
  case bar => ...
  case baz => ...
  case foo => ... // This case is unreachable!
}

Recommended

someVar match {
  case foo => ...
  case bar => ...
  case baz => ...
}