[Bug c/77853] New: -Wimplicit-fallthrough: Fall through comment made ineffective by following comment

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77853

            Bug ID: 77853
           Summary: -Wimplicit-fallthrough: Fall through comment made
                    ineffective by following comment
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: amodra at gmail dot com
  Target Milestone: ---

int
f (int x)
{
  int ret = 0;
  switch (x)
    {
    case 1:
      ret++;
      /* Fall through.  */

      /* Important comment about case 0.  */
    case 0:
      ret++;
    }
  return ret;
}

Noticed when building binutils with current master gcc.