rpcbinding: fix wrappers for Any type, fix #2898

cli/smartcontract/testdata/types/config.yml

@@ -1,3 +1,3 @@
 name: "Types"
 sourceurl: https://github.com/nspcc-dev/neo-go/
-safemethods: ["bool", "int", "bytes", "string", "hash160", "hash256", "publicKey", "signature", "bools", "ints", "bytess", "strings", "hash160s", "hash256s", "publicKeys", "signatures", "aAAStrings", "maps", "crazyMaps"]
+safemethods: ["bool", "int", "bytes", "string", "any", "hash160", "hash256", "publicKey", "signature", "bools", "ints", "bytess", "strings", "hash160s", "hash256s", "publicKeys", "signatures", "aAAStrings", "maps", "crazyMaps"]

cli/smartcontract/testdata/types/rpcbindings.out

@@ -90,6 +90,16 @@ func (c *ContractReader) AAAStrings(s [][][]string) ([][][]string, error) {
 	} (unwrap.Item(c.invoker.Call(Hash, "aAAStrings", s)))
 }
 
+// Any invokes `any` method of contract.
+func (c *ContractReader) Any(a interface{}) (interface{}, error) {
+	return func (item stackitem.Item, err error) (interface{}, error) {
+		if err != nil {
+			return nil, err
+		}
+		return item.Value(), nil
+	} (unwrap.Item(c.invoker.Call(Hash, "any", a)))
+}
+
 // Bool invokes `bool` method of contract.
 func (c *ContractReader) Bool(b bool) (bool, error) {
 	return unwrap.Bool(c.invoker.Call(Hash, "bool", b))

cli/smartcontract/testdata/types/types.go

@@ -20,6 +20,10 @@ func String(s string) string {
 	return ""
 }
 
+func Any(a interface{}) interface{} {
+	return nil
+}
+
 func Hash160(h interop.Hash160) interop.Hash160 {
 	return nil
 }

pkg/smartcontract/rpcbinding/binding.go

@@ -565,7 +565,7 @@ func scTemplateToRPC(cfg binding.Config, ctr ContractTmpl, imports map[string]st
 				ctr.HasIterator = true
 			} else {
 				imports["github.com/nspcc-dev/neo-go/pkg/vm/stackitem"] = struct{}{}
-				ctr.SafeMethods[i].ReturnType = "stackitem.Item"
+				ctr.SafeMethods[i].ReturnType = "interface{}"
 				ctr.SafeMethods[i].Unwrapper = "Item"
 			}
 		case "bool":