patch 8.1.2013: more functions can be used as methods
Problem: More functions can be used as methods.
Solution: Make various functions usable as a method.
diff --git a/src/testdir/test_undo.vim b/src/testdir/test_undo.vim
index 5154b20..c424273 100644
--- a/src/testdir/test_undo.vim
+++ b/src/testdir/test_undo.vim
@@ -456,7 +456,7 @@
call delete('Xundodir', 'd')
" Test undofile() with 'undodir' set to a non-existing directory.
- call assert_equal('', undofile('Xundofoo'))
+ call assert_equal('', 'Xundofoo'->undofile())
if isdirectory('/tmp')
set undodir=/tmp