Implicitly-created companion object clashes when extending inner class with same name

[scabug]

This code fails to compile

class Foo { class Inner(x: Int = 42) }
class Bar extends Foo { class Inner(y: Int = 0) extends super.Inner() }

with the error message

scalatest.scala:2: error: overriding object Inner in class Foo;
 object Inner cannot override final member
class Bar extends Foo { class Inner(y: Int = 0) extends super.Inner() }
                              ^
one error found

This is a bit misleading if you didn't expect the object Inner to be created, particularly as it only refuses to compile if the companion object needs to be created (e.g. when there are default parameters).

A more explanatory error message would probably suffice for now...

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-7769?orig=1
Reporter: @propensive
Affected Versions: 2.10.2, 2.10.4

[scabug]

Christopher Vogt (cvogt) said:
Just because it is easy to miss: the reason that companions are created here are the default values.

[scabug]

Christopher Vogt (cvogt) said:
Workaround suggested by @szeiger:

class Foo { class Inner(x: Int){ def this() = this(42) } }
class Bar extends Foo { class Inner(y: Int = 0) extends super.Inner() }