tests on collection's item assignments and some other changes

t_dict_test.go

@@ -28,6 +28,8 @@ func TestDictParser(t *testing.T) {
 		/*  5 */ {`#{1:"one",2:"two",3:"three"}`, int64(3), nil},
 		/*  6 */ {`{1:"one"} + {2:"two"}`, map[any]any{1: "one", 2: "two"}, nil},
 		/*  7 */ {`2 in {1:"one", 2:"two"}`, true, nil},
+		/*  8 */ {`D={"a":1, "b":2}; D["a"]=9; D`, map[any]any{"a":9, "b":2},nil},
+		/*  9 */ {`D={"a":1, "b":2}; D["z"]=9; D`, map[any]any{"z":9, "a":1, "b":2},nil},
 	}
 
 	succeeded := 0