From 6db1acfcb64d486e947112239fafeef113a95890 Mon Sep 17 00:00:00 2001
From: Nao Yonashiro <owan.orisano@gmail.com>
Date: Fri, 22 Apr 2022 00:35:58 +0900
Subject: [PATCH] fix: to care about the case of OpInterfacePtr

fix #359
---
 decode_test.go             | 13 +++++++++++++
 internal/encoder/opcode.go |  2 +-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/decode_test.go b/decode_test.go
index 577d1d52..1d9f47c5 100644
--- a/decode_test.go
+++ b/decode_test.go
@@ -3918,3 +3918,16 @@ func TestIssue360(t *testing.T) {
 		t.Errorf("unexpected result: %v", uints)
 	}
 }
+
+func TestIssue359(t *testing.T) {
+	var a interface{} = 1
+	var b interface{} = &a
+	var c interface{} = &b
+	v, err := json.Marshal(c)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if string(v) != "1" {
+		t.Errorf("unexpected result: %v", string(v))
+	}
+}
diff --git a/internal/encoder/opcode.go b/internal/encoder/opcode.go
index b02ae351..05fc3ce0 100644
--- a/internal/encoder/opcode.go
+++ b/internal/encoder/opcode.go
@@ -363,7 +363,7 @@ func copyOpcode(code *Opcode) *Opcode {
 
 func setTotalLengthToInterfaceOp(code *Opcode) {
 	for c := code; !c.IsEnd(); {
-		if c.Op == OpInterface {
+		if c.Op == OpInterface || c.Op == OpInterfacePtr {
 			c.Length = uint32(code.TotalLength())
 		}
 		c = c.IterNext()