patch 8.1.1954: more functions can be used as a method

Problem:    More functions can be used as a method.
Solution:   Allow more functions to be used as a method.
diff --git a/src/testdir/test_lispwords.vim b/src/testdir/test_lispwords.vim
index 4c05504..aa5a738 100644
--- a/src/testdir/test_lispwords.vim
+++ b/src/testdir/test_lispwords.vim
@@ -43,6 +43,9 @@
 	      \ ',@body',
 	      \ '(princ "</a>")))'
 	      \ ])
+  call assert_equal(7, lispindent(2))
+  call assert_equal(5, 6->lispindent())
+
   set lisp
   set lispwords&
   let save_copt = &cpoptions