When using implicit scopes together with the linker API, it is easy to run into cases where a memory is cleared before the native call is completed. This can happen at least in 2 cases:

* when a segment is passed by reference to a function (e.g. segment.address()) - this includes the important case of upcall segments

* when a valist is passed to a function

In such cases it's possible for the segment, or the valist not to be alive when the native function starts operating on it.

Of course solving this problem in general is not possible (the native call could hold on to the address for longer and refer to it on a subsequent call) - however, it feels that, for simple cases, this is something that should "just" work.