On 15/09/2010, at 14.39, Joseph Wright <[log in to unmask]> wrote:

> On 15/09/2010 06:33, Heiko Oberdiek wrote:
>> At least etex.sty provides \reserveinserts.
> 
> This I did not know. Perhaps expl3 should make sure it leaves some 'space' for inserts to be safe. Now, what I don't know is how many might be needed.

I usually reserve 30 or so before loading a 'heavy' document class such as memoir. 

Morten