showCode does not print class constructor modifiers

[scabug]

scala> val name = TermName("foo")
name: reflect.runtime.universe.TermName = foo

scala> q"class Foo private[$name](bar: Bar)"
res10: reflect.runtime.universe.ClassDef =
class Foo extends scala.AnyRef {
  <paramaccessor> private[this] val bar: Bar = _;
  private[foo] def <init>(bar: Bar) = {
    super.<init>();
    ()
  }
}

scala> showCode(q"class Foo private[$name](bar: Bar)")
res11: String = class Foo(bar: Bar)

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-8875?orig=1
Reporter: Nicolas Stucki (stucki153)
Affected Versions: 2.11.0

[scabug]

@gourlaysama said:
scala/scala#4045