module mod1
interface
    module subroutine bar()
    end subroutine bar
end interface 
end module mod1
!-------------------------------------------

submodule (mod1) submod
contains
    module subroutine bar()
    implicit none
    !parameter in a submodule causes ICE with ifort 2021.4.0 when compiler flags
    ! /debug-parameters:all or /debug-parameters:used are set aside /debug:full
    integer,parameter :: k = 3  
    end subroutine bar
end submodule submod 
!-------------------------------------------

program test_ICE
use mod1
call bar()
end program test_ICE
    
!command line flags leading to internal compiler error:
! ifort /c /Od /debug:full /debug-parameters:all .\test_ICE_submodule_param.f90
    
! --> fortcom: Fatal: There has been an internal compiler error (C0000005).