Fix name clashes between constructor and fallback function.

test/libsolidity/SolidityNameAndTypeResolution.cpp

@@ -1140,7 +1140,6 @@ BOOST_AUTO_TEST_CASE(fallback_function_twice)
 		}
 	)";
 	CHECK_ERROR_ALLOW_MULTI(text, DeclarationError, (vector<string>{
-		"Function with same name and arguments defined twice.",
 		"Only one fallback function is"
 	}));
 }

test/libsolidity/syntaxTests/constructor/two_constructors_mixed.sol

@@ -0,0 +1,7 @@
+contract test {
+	function test(uint) public { }
+	constructor() public {}
+}
+// ----
+// Warning: (17-47): Defining constructors as functions with the same name as the contract is deprecated. Use "constructor(...) { ... }" instead.
+// DeclarationError: (49-72): More than one constructor defined.

test/libsolidity/syntaxTests/constructor/two_constructors_new.sol

@@ -0,0 +1,6 @@
+contract test {
+	constructor(uint) public { }
+	constructor() public {}
+}
+// ----
+// DeclarationError: (47-70): More than one constructor defined.

test/libsolidity/syntaxTests/constructor/two_constructors_old.sol

@@ -5,4 +5,4 @@ contract test {
 // ----
 // Warning: (17-49): Defining constructors as functions with the same name as the contract is deprecated. Use "constructor(...) { ... }" instead.
 // Warning: (51-76): Defining constructors as functions with the same name as the contract is deprecated. Use "constructor(...) { ... }" instead.
-// DeclarationError: (17-49): More than one constructor defined.
+// DeclarationError: (51-76): More than one constructor defined.