Merge pull request #1018 from ethereum/constructor-constant

Constructor constant

Changelog.md

@@ -22,6 +22,7 @@ Breaking Changes:
  * Modifiers: return does not skip part in modifier after ``_``
  * Placeholder statement `_` in modifier now requires explicit `;`.
  * ``ecrecover`` now returns zero if the input is malformed (it previously returned garbage)
+ * The ``constant`` keyword cannot be used for constructors or the fallback function.
  * Removed ``--interface`` (Solidity interface) output option
  * JSON AST: General cleanup, renamed many nodes to match their C++ names.
  * Json Output: srcmap-runtime renamed to srcmapRuntime

libsolidity/analysis/TypeChecker.cpp

@@ -75,8 +75,12 @@ bool TypeChecker::visit(ContractDefinition const& _contract)
 	checkContractAbstractConstructors(_contract);
 
 	FunctionDefinition const* function = _contract.constructor();
-	if (function && !function->returnParameters().empty())
-		typeError(function->returnParameterList()->location(), "Non-empty \"returns\" directive for constructor.");
+	if (function) {
+		if (!function->returnParameters().empty())
+			typeError(function->returnParameterList()->location(), "Non-empty \"returns\" directive for constructor.");
+		if (function->isDeclaredConst())
+			typeError(function->location(), "Constructor cannot be defined as constant.");
+	}
 
 	FunctionDefinition const* fallbackFunction = nullptr;
 	for (FunctionDefinition const* function: _contract.definedFunctions())

test/libsolidity/SolidityNameAndTypeResolution.cpp

@@ -3989,6 +3989,17 @@ BOOST_AUTO_TEST_CASE(unsatisfied_version)
 	BOOST_CHECK(expectError(text, true) == Error::Type::SyntaxError);
 }
 
+BOOST_AUTO_TEST_CASE(constant_constructor)
+{
+	char const* text = R"(
+		contract test {
+			function test() constant {}
+		}
+	)";
+	BOOST_CHECK(expectError(text, false) == Error::Type::TypeError);
+}
+
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }