call feedkeys(":topleft new\<C-A>\<C-B>\"\<CR>", 'xt')
call assert_equal("\"topleft new", @:)
+ " completion for vim9 and legacy commands
+ call feedkeys(":vim9 call strle\<C-A>\<C-B>\"\<CR>", 'xt')
+ call assert_equal("\"vim9 call strlen(", @:)
+ call feedkeys(":legac call strle\<C-A>\<C-B>\"\<CR>", 'xt')
+ call assert_equal("\"legac call strlen(", @:)
+
" completion for the :match command
call feedkeys(":match Search /pat/\<C-A>\<C-B>\"\<CR>", 'xt')
call assert_equal("\"match Search /pat/\<C-A>", @:)