@alpha annotation on a class clashes with auto-generated companion object definition

[panacekcz]

In the code bellow, a default argument causes automatic generation of a companion object. This object seems to inherit the @alpha annotation from the class. Then, the annotations on the class and the object clash.

minimized code

@scala.annotation.alpha("A") class B(i: Int = 1)

output

1 |@scala.annotation.alpha("A") class B(i: Int = 1)
  |^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |@alpha annotation "A" clashes with other definition is same scope

expectation

The companion object should be generated in such a way, that its definition does not clash with the class.