Index: subversion/bindings/swig/svn_client.i
===================================================================
--- subversion/bindings/swig/svn_client.i	(revision 20090)
+++ subversion/bindings/swig/svn_client.i	(working copy)
@@ -25,6 +25,7 @@
 #endif
 
 %include typemaps.i
+%include constraints.i
 
 %include svn_global.swg
 %import core.i
@@ -49,6 +50,11 @@
   svn_client_ctx_t **
 };
 
+%apply Pointer NONNULL { 
+  const svn_opt_revision_t *revision,
+  const svn_opt_revision_t *peg_revision
+};
+
 %apply const apr_array_header_t *STRINGLIST {
     const apr_array_header_t *targets,
     const apr_array_header_t *diff_options