Add conditions to parse AddrVar

tlb/messages.go

@@ -3,6 +3,7 @@ package tlb
 import (
 	"encoding/hex"
 	"fmt"
+	"math"
 	"strconv"
 	"strings"
 
@@ -330,7 +331,9 @@ func (a *MsgAddress) UnmarshalJSON(b []byte) error {
 		}
 	}
 	// try AddrStd first
-	if len(parts[1]) == 64 {
+	num, err := strconv.ParseInt(parts[0], 10, 32)
+	isWorkchainInt8 := err == nil && num >= int64(math.MinInt8) && num <= int64(math.MaxInt8)
+	if len(parts[1]) == 64 && isWorkchainInt8 && !strings.HasSuffix(parts[1], "_") {
 		var dst [32]byte
 		_, err := hex.Decode(dst[:], []byte(parts[1]))
 		if err != nil {

tlb/messages_test.go

@@ -194,6 +194,30 @@ func TestMsgAddress_UnmarshalJSON(t *testing.T) {
 				},
 			},
 		},
+		{
+			name:       "AddrVar - all good",
+			addressStr: "-43464703:B36192BFD8DB3EABFCC47AE5EF2E7F4ED6AEFB1C2E8F0A3549A66FFC45051CD3:Anycast(30,927184944)",
+			wantAddr: &MsgAddress{
+				SumType: "AddrVar",
+				AddrVar: &struct {
+					Anycast     Maybe[Anycast]
+					AddrLen     Uint9
+					WorkchainId int32
+					Address     boc.BitString
+				}{
+					Anycast: Maybe[Anycast]{
+						Exists: true,
+						Value: Anycast{
+							Depth:      30,
+							RewritePfx: 927184944,
+						},
+					},
+					AddrLen:     256,
+					WorkchainId: -43464703,
+					Address:     mustFromFiftHex("B36192BFD8DB3EABFCC47AE5EF2E7F4ED6AEFB1C2E8F0A3549A66FFC45051CD3"),
+				},
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {