patch 8.2.4530: making comparison with null work changes legacy behavior
Problem: Making comparison with null work changes legacy behavior.
Solution: Only use the better comparison in Vim9 script. (closes #9910)
diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index 5f2020d..3c61d27 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -181,6 +181,38 @@
call v9.CheckScriptFailure(lines, 'E121: Undefined variable: null_list')
endfunc
+func Test_compare_with_null()
+ let s:value = v:null
+ call assert_true(s:value == v:null)
+ let s:value = v:true
+ call assert_false(s:value == v:null)
+ let s:value = v:none
+ call assert_false(s:value == v:null)
+ let s:value = 0
+ call assert_true(s:value == v:null)
+ if has('float')
+ let s:value = 0.0
+ call assert_true(s:value == v:null)
+ endif
+ let s:value = ''
+ call assert_false(s:value == v:null)
+ let s:value = 0z
+ call assert_false(s:value == v:null)
+ let s:value = []
+ call assert_false(s:value == v:null)
+ let s:value = {}
+ call assert_false(s:value == v:null)
+ let s:value = function('len')
+ call assert_false(s:value == v:null)
+ if has('job')
+ let s:value = test_null_job()
+ call assert_true(s:value == v:null)
+ let s:value = test_null_channel()
+ call assert_true(s:value == v:null)
+ endif
+ unlet s:value
+endfunc
+
func Test_setreg_null_list()
let lines =<< trim END
call setreg('x', test_null_list())