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+Type in expressions to have them evaluated.
+Type :help for more information.
+
+scala>
+
+scala> :kind scala.Option
+scala.Option's kind is F[+A]
+
+scala> :k (Int, Int) => Int
+scala.Function2's kind is F[-A1,-A2,+A3]
+
+scala> :k -v Either
+scala.util.Either's kind is F[+A1,+A2]
+* -(+)-> * -(+)-> *
+This is a type constructor: a 1st-order-kinded type.
+
+scala> :k -v scala.collection.generic.ImmutableSortedMapFactory
+scala.collection.generic.ImmutableSortedMapFactory's kind is X[CC[A,B] <: scala.collection.immutable.SortedMap[A,B] with scala.collection.SortedMapLike[A,B,CC[A,B]]]
+(* -> * -> *(scala.collection.immutable.SortedMap[A,B] with scala.collection.SortedMapLike[A,B,CC[A,B]])) -> *
+This is a type constructor that takes type constructor(s): a higher-kinded type.
+
+scala> :k new { def empty = false }
+AnyRef{def empty: Boolean}'s kind is A
+
+scala> :k Nonexisting
+<console>:8: error: not found: value Nonexisting
+ Nonexisting
+ ^
+
+scala>
+
+scala>