patch 7.4.1989
Problem:    filter() and map() only accept a string argument.
Solution:   Implement using a Funcref argument (Yasuhiro Matsumoto, Ken
            Takata)
diff --git a/src/testdir/test_alot.vim b/src/testdir/test_alot.vim
index 76134fb..e8546ef 100644
--- a/src/testdir/test_alot.vim
+++ b/src/testdir/test_alot.vim
@@ -12,6 +12,7 @@
 source test_feedkeys.vim
 source test_fnamemodify.vim
 source test_file_perm.vim
+source test_filter_map.vim
 source test_glob2regpat.vim
 source test_goto.vim
 source test_help_tagjump.vim