String errorParam = StringUtil.segmentAfterMatch(mde.value, "_");
SourceRange errorRange = mde.getSourceRange();
String errorSource = null;
ParserErrorTypes errorType = getErrorTypeFromMDE(mde);
switch (errorType) {
case INVALID_TOKEN_CHARACTERS:
return new ParserError(ParserErrorTypes.INVALID_TOKEN_CHARACTERS, errorRange, mde.sourceValue, null);
case MALFORMED_TOKEN:
errorParam = DeeLexerSourceTests.parseExpectedError(errorParam).toString();