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The following code produces no warning, even though the case _ is unreachable since Bar returns an instance of Some (scalac correctly produces a warning here):
objectBar {
defunapply(x: Int):Some[Int] =Some(0)
}
objectTest {
deftest(x: Int) =
x match {
caseBar(a) => a
case _ => x // should be unreachable
}
}
Interestingly, if we replace Int by a sealed trait, we do produce a warning:
sealedtraitBasecaseclassOne() extendsBaseobjectFoo {
defunapply(x: Base):Some[Int] =Some(0)
}
objectTest {
deftest(x: Base) =
x match {
caseFoo(a) => a
case _ => x
}
}
-- [E030] MatchcaseUnreachableWarning:try/some.scala:12:13-----------------12|case _ => x
|^^^^| unreachable code