no ambiguity error when inheriting conflicting member from java default method

[lrytz]

$ cat A.java
interface A { default int f() { return -10; } }
$ cat Test.scala
trait T { def f = 99 }
class C extends A with T

$ javac A.java
$ qsc Test.scala
$ qs
scala> new C().f
res0: Int = 99

Swapping the order of parents gives the error:

$ cat Test.scala
trait T { def f = 99 }
class C extends T with A

$ qsc Test.scala
Test.scala:5: error: class C inherits conflicting members:
  method f in trait T of type => Int  and
  method f in trait A of type ()Int
(Note: this can be resolved by declaring an override in class C.)
class C extends T with A
      ^
one error found

also, if A is a class instead of an interface, we get the error:

$ cat A.java
public class A { public int f() { return -10; } }
$ cat Test.scala
trait T {  def f = 99 }
class C extends A with T

$ javac A.java
$ qsc Test.scala
Test.scala:5: error: class C inherits conflicting members:
  method f in class A of type ()Int  and
  method f in trait T of type => Int
(Note: this can be resolved by declaring an override in class C.)
class C extends A with T
      ^
one error found

[lrytz]

scala/scala#5282