https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70842
--- Comment #6 from nathanael.huebbe at informatik dot uni-hamburg.de --- (In reply to kargl from comment #5) > With the patch I posted earlier today and code in comment #1, I see > > gfc7 -c a.f90 > a.f90:14:30: > > print*, len(me%string) > 1 > Error: Data transfer element at (1) cannot be polymorphic unless it > is processed by a defined input/output procedure > > I don't use CLASS and know little about its expected behavior. > Is the above even remotely right? I don't think so, but I may be wrong since I'm not an expert when it comes to the FORTRAN standard. The error sounds weird to me, because I would not consider `me%string` to be polymorphic to begin with, and because the value that is printed is the result of the `len()` intrinsic, which is just a non-polymorphic `integer`. Even the type of `me` is known precisely at this point since the statement appears within a `type is()` clause. What I would naively expect is that the code * compiles without error or warning (the issue in comment #1), and that it * prints the correct length of the string (the issue in comment #3). (I do hope my expectations are not in conflict with the standard...)
