[Bug fortran/101333] New: gfortran fails to enforce C711 on assumed-type actual arguments

[sandra at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101333

            Bug ID: 101333
           Summary: gfortran fails to enforce C711 on assumed-type actual
                    arguments
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sandra at gcc dot gnu.org
  Target Milestone: ---

C711 in the 2018 Fortran standard (originally C407c in TS 29113) says:  "An
assumed-type actual argument that corresponds to an assumed-rank dummy argument
shall be assumed-shape or assumed-rank."

gfortran is failing to diagnose violations when an assumed-size array or scalar
is passed.

Test case is c407-1.f90 from the TS29113 testsuite, WIP version posted here:

https://gcc.gnu.org/pipermail/gcc-patches/2021-July/574115.html