[Bug python/16324] New: py-finishbreakpoint.c incorrect frame_id_eq

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16324

            Bug ID: 16324
           Summary: py-finishbreakpoint.c incorrect frame_id_eq
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com

if (frame_id_eq (frame_id, null_frame_id))
                PyErr_SetString (PyExc_ValueError,
                                 _("Invalid ID for the `frame' object."));

it can never happen as frame_id_eq (null_frame_id, null_frame_id) is false:
     /* Like a NaN, if either ID is invalid, the result is false.
+
  /* Make the sentinel frame's ID valid, but invalid.  That way all
     comparisons with it should fail.  */
  frame->this_id.p = 1;
  frame->this_id.value = null_frame_id;

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