Manually throw error for incomplete expression

[melonedo]

Fix #311

[Gnimuc]

To fix #311, we should add support for this macro pattern instead of skipping it.

[melonedo]

Can we support this kind of macro? void * is tricky even in C...
But at least we must ensure the generated code is valid Julia code, so I forced the generator to ignore this macro.

[Gnimuc]

No need to be generic. In this specific case, we can check: if the parsed expr is incomplete and the last char in str is *, then we remove this * from str and parse again until all of the tailing * are recursively removed; now the only thing left should be a valid Julia type, if not, we just give up and skip.

[Gnimuc]

@melonedo, is this ready to merge?

[melonedo]

I think yes. I do not see any regression locally.

[Gnimuc]

Thanks!