The interpretation request came in a long time ago but I only just got
around to implementing it.

The updated text from the standard is in the comment. Now I am writing
this, I think that I should perhaps use switch(op)/case rather than using
if/else if and depending on the order of the gfc_intrinsic_op enum being
maintained. Thoughts?

The testcase runs fine with both mainline and nagfor. I think that
compile-only with counts of star-eq and star_not should suffice.

Regtests with no regressions. OK for mainline?

Paul

Fortran: Defined operators with unlimited polymorphic args [PR98498]

2023-11-01  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
PR fortran/98498
* interface.cc (upoly_ok): New function.
(gfc_extend_expr): Use new function to ensure that defined
operators using unlimited polymorphic formal arguments do not
override their intrinsic uses.

gcc/testsuite/
PR fortran/98498
* gfortran.dg/interface_50.f90: New test.