scalac-hash v2.11.4 sandbox/test.scala
sandbox/test.scala:5: error: recursive value test needs type
  def b = test.b
          ^
sandbox/test.scala:3: warning: type-checking the invocation of method apply checks if the named argument expression 'b = ...' is a valid assignment
in the current scope. The resulting type inference error (see above) can be fixed by providing an explicit type in the local definition for b.
  val test = Test(a = 10, b = "123")
                            ^
sandbox/test.scala:3: warning: type-checking the invocation of method apply checks if the named argument expression 'a = ...' is a valid assignment
in the current scope. The resulting type inference error (see above) can be fixed by providing an explicit type in the local definition for a.
  val test = Test(a = 10, b = "123")
                    ^
two warnings found
one error found