Bypass "previously defined" errors?

[mitchell]

Adrian,

> Could you give a bit more information about the use case? I haven't
> heard of anyone needing to do this before. Is it because you've got some
> stock ragel parser and you want to specialize it to some task by
> redefining things?

I am writing programming language parsers. Some languages have other
languages embedded in them. I want to "include" an embedded (child)
language into a parent one. However, since either language parser can
be used separately on its own, both "include" a common.rl file that
contains common definitions and actions used by most parsers. Thus
there is a double inclusion of common.rl and the error message for a
parent-child language parser.

Thanks for your time,