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+t8736-c.scala:4: warning: higher-kinded type should be enabled
+by making the implicit value scala.language.higherKinds visible.
+This can be achieved by adding the import clause 'import scala.language.higherKinds'
+or by setting the compiler option -language:higherKinds.
+See the Scala docs for value scala.language.higherKinds for a discussion
+why the feature should be explicitly enabled.
+ def hk[M[_]] = ???
+ ^
+error: No warnings can be incurred under -Xfatal-warnings.
+one warning found
+one error found