tree 3c73f72b0fe18bc46895eeae077370396289f4b0
parent 99c679159433963ec770627428e0db32c21b0007
author John Glassmyer <jogl@google.com> 1436566588 -0700
committer John Glassmyer <jogl@google.com> 1436566588 -0700

Improvments to checking for conflicts among tag numbers and names:
1) Do not consider elements of a nested "extend" when checking for conflicts
   with "reserved" or "extensions" declarations.
2) Do not report more than one conflict error per element.
3) Consider elements of groups when checking for field-number conflicts.

Change-Id: Iee85fd7b16ef79686984f1f20ee9b22053577dd6