From a3f419f8df723fa253670f4a14f22f7bd16bc97f Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Tue, 4 Aug 2020 12:03:31 +0300
Subject: [PATCH] emit: allow to emit Null

---
 pkg/vm/emit/emit.go      | 7 +++++--
 pkg/vm/emit/emit_test.go | 3 ++-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/pkg/vm/emit/emit.go b/pkg/vm/emit/emit.go
index 0d3fbd38a..e2de1df46 100644
--- a/pkg/vm/emit/emit.go
+++ b/pkg/vm/emit/emit.go
@@ -79,8 +79,11 @@ func Array(w *io.BinWriter, es ...interface{}) {
 		case bool:
 			Bool(w, e)
 		default:
-			w.Err = errors.New("unsupported type")
-			return
+			if es[i] != nil {
+				w.Err = errors.New("unsupported type")
+				return
+			}
+			Opcode(w, opcode.PUSHNULL)
 		}
 	}
 	Int(w, int64(len(es)))
diff --git a/pkg/vm/emit/emit_test.go b/pkg/vm/emit/emit_test.go
index 67fec612d..ddda3e684 100644
--- a/pkg/vm/emit/emit_test.go
+++ b/pkg/vm/emit/emit_test.go
@@ -142,7 +142,7 @@ func TestBytes(t *testing.T) {
 func TestEmitArray(t *testing.T) {
 	t.Run("good", func(t *testing.T) {
 		buf := io.NewBufBinWriter()
-		Array(buf.BinWriter, int64(1), "str", true, []byte{0xCA, 0xFE})
+		Array(buf.BinWriter, nil, int64(1), "str", true, []byte{0xCA, 0xFE})
 		require.NoError(t, buf.Err)
 
 		res := buf.Bytes()
@@ -154,6 +154,7 @@ func TestEmitArray(t *testing.T) {
 		assert.EqualValues(t, 3, res[6])
 		assert.EqualValues(t, []byte("str"), res[7:10])
 		assert.EqualValues(t, opcode.PUSH1, res[10])
+		assert.EqualValues(t, opcode.PUSHNULL, res[11])
 	})
 
 	t.Run("empty", func(t *testing.T) {