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scala> def foo[T]{
import scala.reflect.runtime.universe._
val tt = implicitly[WeakTypeTag[List[T]]]
println(tt)
}
<console>:13: free type: Ident(TypeName("T")) defined by foo in <console>:11:9
val tt = implicitly[WeakTypeTag[List[T]]]
^
foo: [T]=> Unit
scala> foo[Int]
WeakTypeTag[scala.List[T]]
scala> :quit
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