File: t3683b.check

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t3683b.scala:15: error: constructor cannot be instantiated to expected type;
 found   : X
 required: W[Bar]
Note: Foo >: Bar (and X <: W[Foo]), but trait W is invariant in type T.
You may wish to define T as -T instead. (SLS 4.5)
      case X() => 1
           ^
one error found