patch 8.2.3974: Vim9: LISTAPPEND instruction does not check for a locked list
Problem: Vim9: LISTAPPEND instruction does not check for a locked list.
Solution: Check whether the list is locked. (closes #9452)
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index 978ceb0..df9e8ec 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -78,6 +78,17 @@
def Test_add()
CheckDefAndScriptFailure(['add({}, 1)'], ['E1013: Argument 1: type mismatch, expected list<any> but got dict<unknown>', 'E1226: List or Blob required for argument 1'])
CheckDefFailure(['add([1], "a")'], 'E1012: Type mismatch; expected number but got string')
+
+ var lines =<< trim END
+ vim9script
+ g:thelist = [1]
+ lockvar g:thelist
+ def TryChange()
+ g:thelist->add(2)
+ enddef
+ TryChange()
+ END
+ CheckScriptFailure(lines, 'E741:')
enddef
def Test_add_blob()