Fix detection of indirect field

cover_string_test.go

@@ -32,6 +32,18 @@ func TestCoverString(t *testing.T) {
 		name string
 		data interface{}
 	}{
+		{
+			name: "PtrHeadStringComplicated",
+			data: &struct {
+				X *struct {
+					A string
+					B []string
+				}
+			}{X: &struct {
+				A string
+				B []string
+			}{A: "hello", B: []string{"a", "b"}}},
+		},
 		{
 			name: "String",
 			data: string("a"),

internal/encoder/compiler.go

@@ -1399,7 +1399,15 @@ func compileStruct(ctx *compileContext, isPtr bool) (*Opcode, error) {
 				valueCode.Indirect = indirect
 			}
 		} else {
+			if indirect {
+				// if parent is indirect type, set child indirect property to true
 				valueCode.Indirect = indirect
+			} else {
+				// if parent is not indirect type and child have only one field, set child indirect property to false
+				if i == 0 && valueCode.NextField != nil && valueCode.NextField.Op == OpStructEnd {
+					valueCode.Indirect = indirect
+				}
+			}
 		}
 		key := fmt.Sprintf(`"%s":`, tag.Key)
 		escapedKey := fmt.Sprintf(`%s:`, string(AppendEscapedString([]byte{}, tag.Key)))