Align ignore syntax of json tags with fmt, cbor

core/encoding/json/marshal.odin

@@ -406,16 +406,19 @@ marshal_to_writer :: proc(w: io.Writer, v: any, opt: ^Marshal_Options) -> (err:
 			ti := runtime.type_info_base(type_info_of(v.id))
 			info := ti.variant.(runtime.Type_Info_Struct)
 			first_iteration := true
-			fields_loop: for name, i in info.names {
+			for name, i in info.names {
 				omitempty := false
 
 				json_name, extra := json_name_from_tag_value(reflect.struct_tag_get(reflect.Struct_Tag(info.tags[i]), "json"))
+
+				if json_name == "-" {
+					continue
+				}
+
 				for flag in strings.split_iterator(&extra, ",") {
 					switch flag {
 					case "omitempty":
 						omitempty = true
-					case "ignore":
-						continue fields_loop
 					}
 				}
 

tests/core/encoding/json/test_core_json.odin

@@ -373,7 +373,7 @@ utf8_string_of_multibyte_characters :: proc(t: ^testing.T) {
 @test
 struct_with_ignore_tags :: proc(t: ^testing.T) {
 	My_Struct :: struct {
-		a: string `json:"_,ignore"`,
+		a: string `json:"-"`,
 	}
 
 	my_struct := My_Struct{