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From: "ygalklein at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/101199] program changes the value of a dummy argument
Date: Fri, 25 Jun 2021 05:59:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101199

--- Comment #2 from ygal klein <ygalklein at gmail dot com> ---
The problem also persists in an example code that is with no extended type:

```fortran
module mod_original_struct
    implicit none

    private
    public :: original_struct

    type original_struct
        private
        real, PUBLIC :: var1
        contains

        private
        procedure, public :: init=3D>initoriginal_struct, advance
    end type original_struct

    contains

    subroutine advance(this)
        class(original_struct), intent(inout) :: this
        print*, 'head of advance, this%var1 =3D ', this%var1
        call this%init(var1=3Dthis%var1)
    end subroutine advance

    subroutine initoriginal_struct(this, var1)
        class(original_struct), intent(out) :: this
        real, intent(in) :: var1
        print*, 'head of initoriginal_struct, the input argument var1 =3D '=
, var1
        this%var1 =3D var1
    end subroutine initoriginal_struct

end module mod_original_struct

program example
    use mod_original_struct, only: original_struct
    implicit none
    type(original_struct) :: struct1
    call struct1%init(var1=3D10.)
    print*, 'bf advance, struct1%var1 =3D ', struct1%var1
    call struct1%advance()
end program example
```

The gfortran wrong output is:

 head of initoriginal_struct, the input argument var1 =3D    10.00000000000=
0000=20=20=20
 bf advance, struct1%var1 =3D    10.000000000000000=20=20=20=20=20
 head of advance, this%var1 =3D    10.000000000000000=20=20=20=20=20
 head of initoriginal_struct, the input argument var1 =3D    0.000000000000=
0000=20

using intel 2020u4 provides the right output.=