https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91752

            Bug ID: 91752
           Summary: BOZ constant outside DATA/INT/REAL/DBLE/CMPLX flagged
                    as error
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: juergen.reuter at desy dot de
  Target Milestone: ---

nagfor and ifort do not flag this as an error, but only warn as an extension: 

program main
  implicit none
  integer :: h
  h = B"11"   

end program main

This has been introduced into gfortran 10 very recently, but breaks many
running codes. Wouldn't you mind turning this into a warning?

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