patch 8.2.3900: it is not easy to use a script-local function for an option
Problem: It is not easy to use a script-local function for an option.
Solution: recognize s: and <SID> at the start of the expression. (Yegappan
Lakshmanan, closes #9401)
diff --git a/src/testdir/test_fold.vim b/src/testdir/test_fold.vim
index 85fa43d..d35b7c8 100644
--- a/src/testdir/test_fold.vim
+++ b/src/testdir/test_fold.vim
@@ -1382,4 +1382,30 @@
bw!
endfunc
+" Test for using a script-local function for 'foldexpr'
+func Test_foldexpr_scriptlocal_func()
+ func! s:FoldFunc()
+ let g:FoldLnum = v:lnum
+ endfunc
+ new | only
+ call setline(1, 'abc')
+ let g:FoldLnum = 0
+ set foldmethod=expr foldexpr=s:FoldFunc()
+ redraw!
+ call assert_equal(expand('<SID>') .. 'FoldFunc()', &foldexpr)
+ call assert_equal(1, g:FoldLnum)
+ set foldmethod& foldexpr=
+ bw!
+ new | only
+ call setline(1, 'abc')
+ let g:FoldLnum = 0
+ set foldmethod=expr foldexpr=<SID>FoldFunc()
+ redraw!
+ call assert_equal(expand('<SID>') .. 'FoldFunc()', &foldexpr)
+ call assert_equal(1, g:FoldLnum)
+ set foldmethod& foldexpr=
+ delfunc s:FoldFunc
+ bw!
+endfunc
+
" vim: shiftwidth=2 sts=2 expandtab