patch 8.2.4384: Vim9: error message not tested, some code not tested

Problem:    Vim9: error message not tested, some code not tested.
Solution:   Add a couple of test cases.  Give an error for a command modifier
            without a command.

src/errors.h

@@ -2791,7 +2791,8 @@ EXTERN char e_missing_argument_type_for_str[]
 // E1080 unused
 EXTERN char e_cannot_unlet_str[]
 	INIT(= N_("E1081: Cannot unlet %s"));
-// E1082 unused
+EXTERN char e_command_modifier_without_command[]
+	INIT(= N_("E1082: Command modifier without command"));
 EXTERN char e_missing_backtick[]
 	INIT(= N_("E1083: Missing backtick"));
 EXTERN char e_cannot_delete_vim9_script_function_str[]

src/ex_docmd.c

@@ -2784,6 +2784,7 @@ parse_command_modifiers(
 {
     char_u  *p;
     int	    starts_with_colon = FALSE;
+    int	    vim9script = in_vim9script();
 
     CLEAR_POINTER(cmod);
     cmod->cmod_flags = sticky_cmdmod_flags;
@@ -2819,12 +2820,18 @@ parse_command_modifiers(
 		if (eap->nextcmd != NULL)
 		    ++eap->nextcmd;
 	    }
+	    if (vim9script && has_cmdmod(cmod, FALSE))
+		*errormsg = _(e_command_modifier_without_command);
 	    return FAIL;
 	}
 	if (*eap->cmd == NUL)
 	{
 	    if (!skip_only)
+	    {
 		ex_pressedreturn = TRUE;
+		if (vim9script && has_cmdmod(cmod, FALSE))
+		    *errormsg = _(e_command_modifier_without_command);
+	    }
 	    return FAIL;
 	}
 
@@ -2838,7 +2845,7 @@ parse_command_modifiers(
 	//   verbose[expr] = 2
 	// But not:
 	//   verbose [a, b] = list
-	if (in_vim9script())
+	if (vim9script)
 	{
 	    char_u *s, *n;
 
@@ -2915,7 +2922,7 @@ parse_command_modifiers(
 #ifdef FEAT_EVAL
 					// in ":filter #pat# cmd" # does not
 					// start a comment
-				     && (!in_vim9script() || VIM_ISWHITE(p[1]))
+				     && (!vim9script || VIM_ISWHITE(p[1]))
 #endif
 				     ))
 				break;
@@ -2928,7 +2935,7 @@ parse_command_modifiers(
 			    }
 #ifdef FEAT_EVAL
 			    // Avoid that "filter(arg)" is recognized.
-			    if (in_vim9script() && !VIM_ISWHITE(p[-1]))
+			    if (vim9script && !VIM_ISWHITE(p[-1]))
 				break;
 #endif
 			    if (skip_only)

src/testdir/test_vim9_assign.vim

@@ -350,6 +350,11 @@ def Test_assign_unpack()
     assert_equal(1, v1)
     assert_equal(2, v2)
 
+    var _x: number
+    [_x, v2] = [6, 7]
+    assert_equal(6, _x)
+    assert_equal(7, v2)
+
     var reslist = []
     for text in ['aaa {bbb} ccc', 'ddd {eee} fff']
       var before: string
@@ -1481,6 +1486,7 @@ def Test_assign_dict()
 
   v9.CheckDefFailure(["var d: dict<number> = {a: '', b: true}"], 'E1012: Type mismatch; expected dict<number> but got dict<any>', 1)
   v9.CheckDefFailure(["var d: dict<dict<number>> = {x: {a: '', b: true}}"], 'E1012: Type mismatch; expected dict<dict<number>> but got dict<dict<any>>', 1)
+  v9.CheckDefFailure(["var d = {x: 1}", "d[1 : 2] = {y: 2}"], 'E1165: Cannot use a range with an assignment: d[1 : 2] =', 2)
 enddef
 
 def Test_assign_dict_unknown_type()

src/testdir/test_vim9_cmd.vim

@@ -1133,6 +1133,16 @@ def Test_useless_command_modifier()
       silent endtry
   END
   v9.CheckDefAndScriptFailure(lines, 'E1176:', 3)
+
+  lines =<< trim END
+      leftabove
+  END
+  v9.CheckDefAndScriptFailure(lines, 'E1082:', 1)
+
+  lines =<< trim END
+      leftabove # comment
+  END
+  v9.CheckDefAndScriptFailure(lines, 'E1082:', 1)
 enddef
 
 def Test_eval_command()

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4384,
 /**/
     4383,
 /**/

src/vim9compile.c

@@ -2761,13 +2761,7 @@ compile_def_function(
 	cctx.ctx_has_cmdmod = FALSE;
 	if (parse_command_modifiers(&ea, &errormsg, &local_cmdmod, FALSE)
 								       == FAIL)
-	{
-	    if (errormsg != NULL)
 	    goto erret;
-	    // empty line or comment
-	    line = (char_u *)"";
-	    continue;
-	}
 	generate_cmdmods(&cctx, &local_cmdmod);
 	undo_cmdmod(&local_cmdmod);