[release/1.3.4] rlp: add "tail" struct tag

rlp/decode_test.go

@@ -312,6 +312,26 @@ type recstruct struct {
 	Child *recstruct `rlp:"nil"`
 }
 
+type invalidTail1 struct {
+	A uint `rlp:"tail"`
+	B string
+}
+
+type invalidTail2 struct {
+	A uint
+	B string `rlp:"tail"`
+}
+
+type tailRaw struct {
+	A    uint
+	Tail []RawValue `rlp:"tail"`
+}
+
+type tailUint struct {
+	A    uint
+	Tail []uint `rlp:"tail"`
+}
+
 var (
 	veryBigInt = big.NewInt(0).Add(
 		big.NewInt(0).Lsh(big.NewInt(0xFFFFFFFFFFFFFF), 16),
@@ -437,6 +457,38 @@ var decodeTests = []decodeTest{
 		ptr:   new(recstruct),
 		error: "rlp: expected input string or byte for uint, decoding into (rlp.recstruct).Child.I",
 	},
+	{
+		input: "C0",
+		ptr:   new(invalidTail1),
+		error: "rlp: invalid struct tag \"tail\" for rlp.invalidTail1.A (must be on last field)",
+	},
+	{
+		input: "C0",
+		ptr:   new(invalidTail2),
+		error: "rlp: invalid struct tag \"tail\" for rlp.invalidTail2.B (field type is not slice)",
+	},
+	{
+		input: "C50102C20102",
+		ptr:   new(tailUint),
+		error: "rlp: expected input string or byte for uint, decoding into (rlp.tailUint).Tail[1]",
+	},
+
+	// struct tag "tail"
+	{
+		input: "C3010203",
+		ptr:   new(tailRaw),
+		value: tailRaw{A: 1, Tail: []RawValue{unhex("02"), unhex("03")}},
+	},
+	{
+		input: "C20102",
+		ptr:   new(tailRaw),
+		value: tailRaw{A: 1, Tail: []RawValue{unhex("02")}},
+	},
+	{
+		input: "C101",
+		ptr:   new(tailRaw),
+		value: tailRaw{A: 1, Tail: []RawValue{}},
+	},
 
 	// RawValue
 	{input: "01", ptr: new(RawValue), value: RawValue(unhex("01"))},