ICE on clash of names imported via use statement

[Harald1]

The following invalid code crashes current ifort/ifx:

module M1
  use, intrinsic :: ISO_C_BINDING, only: C_PTR
  use, intrinsic :: ISO_C_BINDING, only: X_PTR => C_FUNPTR
  implicit none
end module

module M2
  use M1, only: X_PTR => C_PTR ! C_PTR
  implicit none
end module

module M3
  use M1, only: C_PTR => X_PTR ! C_FUNPTR
  use M2, only: C_PTR => X_PTR ! C_PTR
  implicit none
  type(c_ptr) :: ptr
end module

I get e.g. with ifx:

% ifx ifort-use-clash.f90
ifort-use-clash.f90(13): error #6496: There is more than one use-name for a local-name.   [C_PTR]
  use M1, only: C_PTR => X_PTR ! C_FUNPTR
----------------^
ifort-use-clash.f90(17): internal error: Please visit 'http://www.intel.com/software/products/support' for assistance.
end module
^
ifort-use-clash.f90(17): catastrophic error: Internal Compiler Error: Ref module: ffe_cl.c
compilation aborted for ifort-use-clash.f90 (code 1)

Found while debugging a different issue...

[Barbara_P_Intel]

Thanks for reporting this. The compilers shouldn't ICE even if there is a coding error. I filed CMPLRLLVM-47099 to address it.