provide general hex-literal error message, fixes #1802

dummy

libsolidity/parsing/Parser.cpp

@@ -1554,6 +1554,9 @@ ASTPointer<Expression> Parser::parsePrimaryExpression()
 		expression = nodeFactory.createNode<TupleExpression>(components, isArray);
 		break;
 	}
+	case Token::IllegalHex:
+		fatalParserError("Expected even number of hex-nibbles within double-quotes.");
+		break;		
 	default:
 		if (Token::isElementaryTypeName(token))
 		{

libsolidity/parsing/Scanner.cpp

@@ -612,7 +612,7 @@ void Scanner::scanToken()
 					if (m_char == '"' || m_char == '\'')
 						token = scanHexString();
 					else
-						token = Token::Illegal;
+						token = Token::IllegalHex;
 				}
 			}
 			else if (isDecimalDigit(m_char))
@@ -736,11 +736,11 @@ Token::Value Scanner::scanHexString()
 	{
 		char c = m_char;
 		if (!scanHexByte(c))
-			return Token::Illegal;
+			return Token::IllegalHex;
 		addLiteralChar(c);
 	}
 	if (m_char != quote)
-		return Token::Illegal;
+		return Token::IllegalHex;
 	literal.complete();
 	advance();  // consume quote
 	return Token::StringLiteral;

libsolidity/parsing/Token.h

@@ -261,6 +261,8 @@ namespace solidity
 	\
 	/* Illegal token - not able to scan. */                            \
 	T(Illegal, "ILLEGAL", 0)                                           \
+	/* Illegal hex token */                                            \
+	T(IllegalHex, "ILLEGAL_HEX", 0)                                    \
 	\
 	/* Scanner-internal use only. */                                   \
 	T(Whitespace, NULL, 0)