Add test and changelog

Changelog.md

@@ -7,6 +7,7 @@ Features:
  * Type Checker: Disallow value transfers to contracts without a payable fallback function.
  * Type Checker: Include types in explicit conversion error message.
  * Type Checker: Raise proper error for arrays too large for ABI encoding.
+ * Type checker: Warn if using ``this`` in a constructor.
 
 Bugfixes:
  * Type Checker: Fix invalid "specify storage keyword" warning for reference members of structs.

test/libsolidity/SolidityNameAndTypeResolution.cpp

@@ -4506,7 +4506,7 @@ BOOST_AUTO_TEST_CASE(var_handle_divided_integers)
 			}
 		}
 	)";
-	CHECK_SUCCESS(text);	
+	CHECK_SUCCESS(text);
 }
 
 BOOST_AUTO_TEST_CASE(rational_bitnot_unary_operation)
@@ -6373,6 +6373,20 @@ BOOST_AUTO_TEST_CASE(modifiers_access_storage_pointer)
 	CHECK_SUCCESS_NO_WARNINGS(text);
 }
 
+BOOST_AUTO_TEST_CASE(using_this_in_constructor)
+{
+	char const* text = R"(
+		contract C {
+			function C() {
+				this.f();
+			}
+			function f() {
+			}
+		}
+	)";
+	CHECK_WARNING(text, "\"this\" used in constructor");
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }