t6902.scala:4: error: unreachable code
    case Some(b) => 3 // no warning was emitted
                    ^
t6902.scala:9: error: unreachable code
    case Some(b) => 3 // no warning was emitted
                    ^
t6902.scala:21: error: unreachable code
    case 1 => 3 // crash
              ^
three errors found