no-spec

$ ls
A.scala B.scala

$ cat A.scala
class A[@specialized T](t: T)

$ scalac A.scala

$ cat B.scala
object Test extends App {
  println((new A(3)).getClass)
}

$ scalac B.scala
$ scala Test
class A$mcI$sp

$ scalac B.scala -no-specialization
$ scala Test
class A

$ rm A\$*.class
$ ls
A.class A.scala B.scala Test.class Test$.class Test$delayedInit$body.class

$ scala Test
class A