patch 8.2.1126: Vim9: using :copen causes an error
Problem: Vim9: using :copen causes an error.
Solution: Add flag LET_NO_COMMAND in set_var().
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 8411621..e548717 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -2219,6 +2219,12 @@
delete('Xvim9_script.vim')
enddef
+def Test_vim9_copen()
+ # this was giving an error for setting w:quickfix_title
+ copen
+ quit
+enddef
+
" Keep this last, it messes up highlighting.
def Test_substitute_cmd()
new