> Oh, I thought we never rely on exception "message" for anything
> important. However this seems to be an exception for that exception.
> :-)

I think you're missing the point. People usually don't catch SyntaxError
and run fallback code in this case. And even if they do, they are
unlikely to care about whether the ErreurDeSyntaxe is due to a genuinely
faulty piece of code, or a parser limitation ;)