From 5f175bf3fc9be54b5711509f321ee4d2e21baed2 Mon Sep 17 00:00:00 2001
From: kcln1687 <kcln1687@corp.netease.com>
Date: Tue, 19 Jul 2016 21:20:03 +0800
Subject: [PATCH] fix: panic when passing pointer to pointer as param

---
 structs.go      |  2 +-
 structs_test.go | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/structs.go b/structs.go
index 1c05275..bfcfb70 100644
--- a/structs.go
+++ b/structs.go
@@ -431,7 +431,7 @@ func strctVal(s interface{}) reflect.Value {
 	v := reflect.ValueOf(s)
 
 	// if pointer get the underlying element≤
-	if v.Kind() == reflect.Ptr {
+	for v.Kind() == reflect.Ptr {
 		v = v.Elem()
 	}
 
diff --git a/structs_test.go b/structs_test.go
index 07c23db..69a3943 100644
--- a/structs_test.go
+++ b/structs_test.go
@@ -1376,3 +1376,24 @@ func TestMap_InterfaceValue(t *testing.T) {
 		t.Errorf("Value does not match expected: %q != %q", s["A"], expected)
 	}
 }
+
+func TestPointer2Pointer(t *testing.T) {
+	defer func() {
+		err := recover()
+		if err != nil {
+			fmt.Printf("err %+v\n", err)
+			t.Error("Internal nil pointer should not panic")
+		}
+	}()
+	a := &Animal{
+		Name: "Fluff",
+		Age:  4,
+	}
+	_ = Map(&a)
+
+	b := &a
+	_ = Map(&b)
+
+	c := &b
+	_ = Map(&c)
+}