VS 2015 debugger integration issue with allocated derived sub-types

Hi all,

today I stumbled over an issue in the debugger extension into VS 2015 (update 1). I have a dereived type with again derived type sub-component which is allocatable. In a module I allocate this sub-component. The debugger shows a 'syntax error' in hover over. However, I'm not sure whether the code is conforming to standard.

  program DerivedTypeAllocatableDebugger
    use mod_test
    use mod_allocate
    implicit none

    ! Variables!

    integer, parameter    :: n = 10

    ! ----------------------------------------------------------------------------------

    ! Body of DerivedTypeAllocatableDebugger
    write(*,*) '*** DerivedTypeAllocatableDebugger ***'

    call sub_alloc(n,test_type)

end program DerivedTypeAllocatableDebugger

module mod_test
  implicit none

  type :: subdummy1
    integer             :: number
    character(len=80)   :: name=''
  end type subdummy1
  !
  type :: subdummy2
    integer             :: number
    character(len=80)   :: name=''
    character(len=2 )   :: site=''
  end type subdummy2

  type :: dummy
    type(subdummy1),dimension(:  ),allocatable :: planes
    type(subdummy2),dimension(:,:),allocatable :: lines
  end type dummy

  type(dummy) :: test_type


end module mod_test

module mod_allocate
  implicit none

  private
  public  :: sub_alloc

  contains

  ! --------------------------------------------------------
  subroutine sub_alloc(n,test_type)
    use mod_test, only : dummy
    implicit none
    ! parameter
    integer     :: n
    type(dummy) :: test_type
    ! locals
    character(len=4) :: tdummy
    integer          :: i


    ! -----------------------------------

    allocate(test_type%planes(n))

    do i = 1, n
      write(tdummy,'(i0.4)') i
      test_type%planes(i)%name   = tdummy
      test_type%planes(i)%number = i
    end do

    return


  end subroutine sub_alloc
  ! --------------------------------------------------------

end module mod_allocate

The error looks like:

Any hint what is wrong?

EDIT: VS 2015 Update 1 + PSXE 2016 Update 1

Best regards Johannes