[Bug fortran/85841] New: [F018] reject deleted features

[janus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85841

            Bug ID: 85841
           Summary: [F018] reject deleted features
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: janus at gcc dot gnu.org
  Target Milestone: ---

Fortran 2018 removes the following features:
 * arithmetic IF statement
 * nonblock DO construct

They have been obsolescent since F90, and should now be rejected with
-std=f2018.