added test

test/libsolidity/SolidityNameAndTypeResolution.cpp

@@ -1761,6 +1761,25 @@ BOOST_AUTO_TEST_CASE(uninitialized_var)
 	BOOST_CHECK_THROW(parseTextAndResolveNames(sourceCode), TypeError);
 }
 
+BOOST_AUTO_TEST_CASE(deny_overwriting_of_attributes_when_deriving)
+{
+	// bug #1798
+	char const* sourceCode = R"(
+		contract owned {
+			address owner;
+		}
+
+		contract reg {
+			function owner(bytes32 x) returns (address) {}
+		}
+
+		contract x is owned, reg {
+		}
+	)";
+	ETH_TEST_CHECK_NO_THROW(parseTextAndResolveNames(sourceCode), "Parsing and Name Resolving Failed");
+	//BOOST_CHECK_THROW(parseTextAndResolveNames(sourceCode), TypeError);
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }