Make literals an error for tight packing (experimental 0.5.0)

test/libsolidity/syntaxTests/tight_packing_literals_050.sol

@@ -0,0 +1,26 @@
+pragma experimental "v0.5.0";
+contract C {
+    function f() pure public returns (bytes32) {
+        return keccak256(1);
+    }
+    function g() pure public returns (bytes32) {
+        return sha3(1);
+    }
+    function h() pure public returns (bytes32) {
+        return sha256(1);
+    }
+    function j() pure public returns (bytes32) {
+        return ripemd160(1);
+    }
+    function k() pure public returns (bytes) {
+        return abi.encodePacked(1);
+    }
+}
+
+// ----
+// TypeError: (117-118): Cannot perform packed encoding for a literal. Please convert it to an explicit type first.
+// Warning: (191-198): "sha3" has been deprecated in favour of "keccak256"
+// TypeError: (196-197): Cannot perform packed encoding for a literal. Please convert it to an explicit type first.
+// TypeError: (277-278): Cannot perform packed encoding for a literal. Please convert it to an explicit type first.
+// TypeError: (361-362): Cannot perform packed encoding for a literal. Please convert it to an explicit type first.
+// TypeError: (450-451): Cannot perform packed encoding for a literal. Please convert it to an explicit type first.