Merge pull request #2048 from crytic/dev-abidecode-tuple-udt

Fix abi.decode tuple result with udt

slither/slithir/convert.py

@@ -1294,7 +1294,12 @@ def convert_to_solidity_func(
         and len(new_ir.arguments) == 2
         and isinstance(new_ir.arguments[1], list)
     ):
-        types = list(new_ir.arguments[1])
+        types = []
+        for arg_type in new_ir.arguments[1]:
+            decode_type = arg_type
+            if isinstance(decode_type, (Structure, Enum, Contract)):
+                decode_type = UserDefinedType(decode_type)
+            types.append(decode_type)
         new_ir.lvalue.set_type(types)
     # abi.decode where the type to decode is a singleton
     # abi.decode(a, (uint))