[Bug fortran/54594] New: [OOP] Type-bound ASSIGNMENTs (elemental + array version) rejected as ambiguous

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54594

             Bug #: 54594
           Summary: [OOP] Type-bound ASSIGNMENTs (elemental + array
                    version) rejected as ambiguous
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: bur...@gcc.gnu.org
                CC: ja...@gcc.gnu.org


Created attachment 28197
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28197
generic_defined_assignment.f90

(Note, I haven't checked whether the following bug report is valid.=

The following program by James Van Buskirk compiles with Cray ftn and prints:

 Explicit calls:
 Overloaded
 Overloaded
 Overloaded
 Implicit calls:
 Overloaded array->array
 Overloaded scalar->array
 Overloaded

However, it fails with gfortran with the error:

     generic :: assignment(=) => a_ass
                                1
Error: 'a_ass' and 'a_ass_sv' for GENERIC '=' at (1) are ambiguous


Note for the defined assignment, you need the patch for PR46897, cf.
http://gcc.gnu.org/ml/fortran/2012-09/msg00034.html

See also discussion at
https://groups.google.com/forum/?fromgroups=#!topic/comp.lang.fortran/5eAz5ns6AG0