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> Two related queries.
> 1. If you fail to checkstack and the function's error handling is
>     classified as '-', this may cause low-level errors (segmentation
>     etc) not caught by Lua, right?

Yes. That is life in C...

> 2. I've written a vararg function which builds up a lot of stuff
>     on top of the vararg, but the vararg itself is not returned.
>     There seems not to be a cheap API function for removing
>     contiguous buried items, you have to do it one at a time.
>     That's O(n^2) if the number 'n' of items to remove is the
>     same the depth to which they are buried. Is it in any way
>     perilous just to leave them there?

Not at all. It is expected. (The 'int' return in lua_Cfunction exists
only to allow this.)

-- Roberto