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Merge pull request #10198 from som-snytt/issue/12671-dotty-override-i…
…nference Use narrowest type for pt of override if Xsrc:3
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// scalac: -Xsource:3 | ||
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import scala.collection.{mutable, IterableOnce} | ||
import scala.collection.immutable.{AbstractSet, Set, SetOps} | ||
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final case class Foo[-T](components: IndexedSeq[Int]) | ||
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sealed trait FooTrie[T] | ||
extends AbstractSet[Foo[T]] | ||
with SetOps[Foo[T], Set, FooTrie[T]] { | ||
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override def fromSpecific( | ||
coll: IterableOnce[Foo[T]] | ||
): FooTrie[T] = { | ||
coll.iterator.foldLeft(empty)(_ incl _) // error here | ||
} | ||
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override def newSpecificBuilder | ||
: mutable.Builder[Foo[T], FooTrie[T]] = ??? | ||
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override def incl(elem: Foo[T]): FooTrie[T] = ??? | ||
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override def empty = FooTrie.empty[T] | ||
//override def empty: FooTrie[T] = FooTrie.empty[T] | ||
} | ||
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object FooTrie { | ||
def empty[T]: FooTrie[T] = ??? | ||
} |