Disallow packed encoding of literals.

Changelog.md

@@ -27,6 +27,7 @@ Breaking Changes:
  * Optimizer: Remove the no-op ``PUSH1 0 NOT AND`` sequence.
  * Parser: Disallow trailing dots that are not followed by a number.
  * Type Checker: Disallow arithmetic operations for boolean variables.
+ * Type Checker: Disallow tight packing of literals. This was already the case in the experimental 0.5.0 mode.
  * Type Checker: Disallow conversions between ``bytesX`` and ``uintY`` of different size.
  * Type Checker: Only accept a single ``bytes`` type for ``.call()`` (and family), ``keccak256()``, ``sha256()`` and ``ripemd160()``.
  * Remove obsolete ``std`` directory from the Solidity repository. This means accessing ``https://github.com/ethereum/soldity/blob/develop/std/*.sol`` (or ``https://github.com/ethereum/solidity/std/*.sol`` in Remix) will not be possible.

libsolidity/analysis/TypeChecker.cpp

@@ -1702,8 +1702,6 @@ bool TypeChecker::visit(FunctionCall const& _functionCall)
 	else
 		_functionCall.annotation().type = make_shared<TupleType>(returnTypes);
 
-	bool const v050 = m_scope->sourceUnit().annotation().experimentalFeatures.count(ExperimentalFeature::V050);
-
 	if (auto functionName = dynamic_cast<Identifier const*>(&_functionCall.expression()))
 	{
 		if (functionName->name() == "sha3" && functionType->kind() == FunctionType::Kind::SHA3)
@@ -1723,23 +1721,15 @@ bool TypeChecker::visit(FunctionCall const& _functionCall)
 			auto const& argType = type(*arguments[i]);
 			if (auto literal = dynamic_cast<RationalNumberType const*>(argType.get()))
 			{
-				/* If no mobile type is available an error will be raised elsewhere. */
 				if (literal->mobileType())
+					m_errorReporter.typeError(
+						arguments[i]->location(),
+						"Cannot perform packed encoding for a literal. Please convert it to an explicit type first."
+					);
+				else
 				{
-					if (v050)
-						m_errorReporter.typeError(
-							arguments[i]->location(),
-							"Cannot perform packed encoding for a literal. Please convert it to an explicit type first."
-						);
-					else
-						m_errorReporter.warning(
-							arguments[i]->location(),
-							"The type of \"" +
-							argType->toString() +
-							"\" was inferred as " +
-							literal->mobileType()->toString() +
-							". This is probably not desired. Use an explicit type to silence this warning."
-						);
+					/* If no mobile type is available an error will be raised elsewhere. */
+					solAssert(m_errorReporter.hasErrors(), "");
 				}
 			}
 		}

libsolidity/interface/ErrorReporter.h

@@ -92,6 +92,12 @@ public:
 
 	void clear();
 
+	/// @returns true iff there is any error (ignores warnings).
+	bool hasErrors() const
+	{
+		return m_errorCount > 0;
+	}
+
 private:
 	void error(Error::Type _type,
 		SourceLocation const& _location,

test/libsolidity/SolidityEndToEndTest.cpp

@@ -2082,7 +2082,7 @@ BOOST_AUTO_TEST_CASE(packed_keccak256)
 			function a(bytes32 input) returns (bytes32 hash) {
 				uint24 b = 65536;
 				uint c = 256;
-				return keccak256(abi.encodePacked(8, input, b, input, c));
+				return keccak256(abi.encodePacked(uint8(8), input, b, input, c));
 			}
 		}
 	)";
@@ -2134,7 +2134,7 @@ BOOST_AUTO_TEST_CASE(packed_sha256)
 			function a(bytes32 input) returns (bytes32 hash) {
 				uint24 b = 65536;
 				uint c = 256;
-				return sha256(abi.encodePacked(8, input, b, input, c));
+				return sha256(abi.encodePacked(uint8(8), input, b, input, c));
 			}
 		}
 	)";
@@ -2161,7 +2161,7 @@ BOOST_AUTO_TEST_CASE(packed_ripemd160)
 			function a(bytes32 input) returns (bytes32 hash) {
 				uint24 b = 65536;
 				uint c = 256;
-				return ripemd160(abi.encodePacked(8, input, b, input, c));
+				return ripemd160(abi.encodePacked(uint8(8), input, b, input, c));
 			}
 		}
 	)";
@@ -3578,7 +3578,7 @@ BOOST_AUTO_TEST_CASE(keccak256_multiple_arguments_with_numeric_literals)
 		contract c {
 			function foo(uint a, uint16 b) returns (bytes32 d)
 			{
-				d = keccak256(abi.encodePacked(a, b, 145));
+				d = keccak256(abi.encodePacked(a, b, uint8(145)));
 			}
 		}
 	)";
@@ -3603,7 +3603,7 @@ BOOST_AUTO_TEST_CASE(keccak256_multiple_arguments_with_string_literals)
 			}
 			function bar(uint a, uint16 b) returns (bytes32 d)
 			{
-				d = keccak256(abi.encodePacked(a, b, 145, "foo"));
+				d = keccak256(abi.encodePacked(a, b, uint8(145), "foo"));
 			}
 		}
 	)";

test/libsolidity/syntaxTests/tight_packing_literals.sol

@@ -5,4 +5,4 @@ contract C {
 }
 
 // ----
-// Warning: (92-93): The type of "int_const 1" was inferred as uint8. This is probably not desired. Use an explicit type to silence this warning.
+// TypeError: (92-93): Cannot perform packed encoding for a literal. Please convert it to an explicit type first.

test/libsolidity/syntaxTests/tight_packing_literals_050.sol

@@ -1,9 +0,0 @@
-pragma experimental "v0.5.0";
-contract C {
-    function k() pure public returns (bytes) {
-        return abi.encodePacked(1);
-    }
-}
-
-// ----
-// TypeError: (122-123): Cannot perform packed encoding for a literal. Please convert it to an explicit type first.