patch 8.2.0920: writing viminfo fails with a circular reference
Problem: Writing viminfo fails with a circular reference.
Solution: Use copyID to detect the cycle. (closes #6217)
diff --git a/src/testdir/test_viminfo.vim b/src/testdir/test_viminfo.vim
index b4708f5..8650598 100644
--- a/src/testdir/test_viminfo.vim
+++ b/src/testdir/test_viminfo.vim
@@ -91,6 +91,28 @@
set viminfo-=!
endfunc
+func Test_global_vars_with_circular_reference()
+ let g:MY_GLOBAL_LIST = []
+ call add(g:MY_GLOBAL_LIST, g:MY_GLOBAL_LIST)
+ let g:MY_GLOBAL_DICT = {}
+ let g:MY_GLOBAL_DICT['self'] = g:MY_GLOBAL_DICT
+
+ set viminfo='100,<50,s10,h,!,nviminfo
+ wv! Xviminfo
+ call assert_equal(v:errmsg, '')
+
+ unlet g:MY_GLOBAL_LIST
+ unlet g:MY_GLOBAL_DICT
+
+ rv! Xviminfo
+ call assert_equal(v:errmsg, '')
+ call assert_true(!exists('g:MY_GLOBAL_LIST'))
+ call assert_true(!exists('g:MY_GLOBAL_DICT'))
+
+ call delete('Xviminfo')
+ set viminfo-=!
+endfunc
+
func Test_cmdline_history()
call histdel(':')
call test_settime(11)