name-lookup-stable.scala:15: error: reference to PrimaryKey is ambiguous;
it is both defined in class A and imported subsequently by
import ColumnOption._
    (null: Any) match { case PrimaryKey => }
                             ^
name-lookup-stable.scala:17: error: reference to PrimaryKey is ambiguous;
it is both defined in class A and imported subsequently by
import ColumnOption._
    PrimaryKey // was already ambiguous in 2.10.3
    ^
two errors found