fix: determining embedded structs was wrong

fix #362

decode_test.go

@@ -3944,3 +3944,18 @@ func TestIssue364(t *testing.T) {
 		t.Errorf("unexpected result: %v", v.Description)
 	}
 }
+
+func TestIssue362(t *testing.T) {
+	type AliasedPrimitive int
+	type Combiner struct {
+		SomeField int
+		AliasedPrimitive
+	}
+	originalCombiner := Combiner{AliasedPrimitive: 7}
+	b, err := json.Marshal(originalCombiner)
+	assertErr(t, err)
+	newCombiner := Combiner{}
+	err = json.Unmarshal(b, &newCombiner)
+	assertErr(t, err)
+	assertEq(t, "TestEmbeddedPrimitiveAlias", originalCombiner, newCombiner)
+}

internal/decoder/compile.go

@@ -394,6 +394,15 @@ func compileStruct(typ *runtime.Type, structName, fieldName string, structTypeTo
 						allFields = append(allFields, fieldSet)
 					}
 				}
+			} else {
+				fieldSet := &structFieldSet{
+					dec:         dec,
+					offset:      field.Offset,
+					isTaggedKey: tag.IsTaggedKey,
+					key:         field.Name,
+					keyLen:      int64(len(field.Name)),
+				}
+				allFields = append(allFields, fieldSet)
 			}
 		} else {
 			if tag.IsString && isStringTagSupportedType(runtime.Type2RType(field.Type)) {

internal/encoder/code.go

@@ -2,6 +2,7 @@ package encoder
 
 import (
 	"fmt"
+	"reflect"
 	"unsafe"
 
 	"github.com/goccy/go-json/internal/runtime"
@@ -383,7 +384,7 @@ func (c *StructCode) Kind() CodeKind {
 }
 
 func (c *StructCode) lastFieldCode(field *StructFieldCode, firstField *Opcode) *Opcode {
-	if field.isAnonymous {
+	if isEmbeddedStruct(field) {
 		return c.lastAnonymousFieldCode(firstField)
 	}
 	lastField := firstField
@@ -436,7 +437,7 @@ func (c *StructCode) ToOpcode(ctx *compileContext) Opcodes {
 		}
 		if isEndField {
 			endField := fieldCodes.Last()
-			if field.isAnonymous {
+			if isEmbeddedStruct(field) {
 				firstField.End = endField
 				lastField := c.lastAnonymousFieldCode(firstField)
 				lastField.NextField = endField
@@ -1003,3 +1004,14 @@ func convertPtrOp(code *Opcode) OpType {
 	}
 	return code.Op
 }
+
+func isEmbeddedStruct(field *StructFieldCode) bool {
+	if !field.isAnonymous {
+		return false
+	}
+	t := field.typ
+	if t.Kind() == reflect.Pointer {
+		t = t.Elem()
+	}
+	return t.Kind() == reflect.Struct
+}

internal/runtime/struct_field.go

@@ -13,7 +13,11 @@ func getTag(field reflect.StructField) string {
 func IsIgnoredStructField(field reflect.StructField) bool {
 	if field.PkgPath != "" {
 		if field.Anonymous {
-			if !(field.Type.Kind() == reflect.Ptr && field.Type.Elem().Kind() == reflect.Struct) && field.Type.Kind() != reflect.Struct {
+			t := field.Type
+			if t.Kind() == reflect.Ptr {
+				t = t.Elem()
+			}
+			if !field.IsExported() && t.Kind() != reflect.Struct {
 				return true
 			}
 		} else {