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t856.scala:3: error: class ComplexRect needs to be abstract, since:
it has 2 unimplemented members.
/** As seen from class ComplexRect, the missing signatures are as follows.
* For convenience, these are usable as stub implementations.
*/
// Members declared in scala.Equals
def canEqual(that: Any): Boolean = ???
// Members declared in scala.Product2
def _2: Double = ???
class ComplexRect(val _1:Double, _2:Double) extends Complex {
^
one error found
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