Now that the rst plugin uses Python3, the test should test docutils existence also with Python3:

--- rst.t.orig  2018-02-28 10:41:06.000000000 +0000
+++ rst.t   2018-03-03 17:17:23.862702468 +0000
@@ -3,7 +3,7 @@
 use strict;

 BEGIN {
-   if (system("python -c 'import docutils.core'") != 0) {
+   if (system("python3 -c 'import docutils.core'") != 0) {
        eval 'use Test::More skip_all => "docutils not available"';
    }
 }

Applied, thanks. --smcv