[Bug fortran/48298] [F03] User-Defined Derived-Type IO (DTIO)

[pault at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48298

--- Comment #22 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to Walter Spector from comment #18)
> Awesome!
> 
> I have noticed one bug so far.  The compiler is missing a check to see if
> the arguments in the I/O procedures have the 'optional' attribute.  It is
> allowing the attribute - even though it is illegal.  E.g. the following
> should be flagged as erroneous:
> 
>   SUBROUTINE pwf (dtv,unit,iotype,vlist,iostat,iomsg)
>     ! argument definitions
>     CLASS(person), INTENT(IN) :: dtv
>     INTEGER, INTENT(IN), OPTIONAL :: unit
>     CHARACTER (LEN=*), INTENT(IN), OPTIONAL :: iotype
>     INTEGER, INTENT(IN), OPTIONAL :: vlist(:)
>     INTEGER, INTENT(OUT), OPTIONAL :: iostat
>     CHARACTER (LEN=*), INTENT(INOUT), OPTIONAL :: iomsg
>     ...
> 
> Walter

Hi Walter,

I missed this comment - apologies. I will deal with it asap.

Cheers

Paul