forlab_io.f90 Fortran runtime error: Attempt to DEALLOCATE unallocated 'self' about forlab

[Beliavsky]

The subroutine where the error occurs is

    subroutine close (self)

        class(file), intent(out) :: self

        deallocate(self%filename)
        close(self%unit)

    end subroutine close

Since self is intent(out), I think its components start out unallocated, and you cannot deallocate something that is not allocated. When I remove the deallocate statement there is no error.

[Beliavsky]

Works for me, thanks.

[zoziha]

Yes, It shall be class(file), intent(inout) :: self.

Thank you for your use. I have recently been in contact with fortran-lang's projects stdlib and fftpack. I tried to improve the forlab project before, but it seems that I am not experienced enough and don’t have the idea of engineering. I have studied in fortran-lang for a period of time. Yesterday I just wanted to refactor forlab to make it perfect.
I plan to contribute some more meaningful routines to stdlib. Forlab will use stdlib as a dependency and specify it in the document to determine the survival range of forlab.

[zoziha]

I submitted and merged a PR #18 , which should solve this issue.