[Bug fortran/38619] error message when converting between different derived types with same name

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38619

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P5
             Status|NEW                         |WAITING
           Severity|normal                      |enhancement

--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The test compiles if SEQUENCE is added after

   TYPE :: ta

I agree that the error "Can't convert TYPE(ta) to TYPE(ta)" is not very
helpful.

One possibility is to split

      gfc_error ("Can't convert %s to %s at %L",
                 gfc_typename (&from_ts), gfc_typename (ts), &expr->where);

in intrinsic.c, one for the general case and one for derived types with the
addition of something such as "consider adding a SEQUENCE statement".

Is it worth the trouble (the PR is ten year old)?