patch 7.4.1559
Problem:    Passing cookie to a callback is clumsy.
Solution:   Change function() to take arguments and return a partial.
diff --git a/src/testdir/test_alot.vim b/src/testdir/test_alot.vim
index a1d819d..55502ba 100644
--- a/src/testdir/test_alot.vim
+++ b/src/testdir/test_alot.vim
@@ -12,6 +12,7 @@
 source test_join.vim
 source test_lispwords.vim
 source test_menu.vim
+source test_partial.vim
 source test_reltime.vim
 source test_searchpos.vim
 source test_set.vim