MenhirLib.InfiniteArraySourceThis module implements infinite arrays. *
get a i returns the element contained at offset i in the array a. Slots are numbered 0 and up. *
set a i x sets the element contained at offset i in the array a to x. Slots are numbered 0 and up. *
extent a is the length of an initial segment of the array a that is sufficiently large to contain all set operations ever performed. In other words, all elements beyond that segment have the default value.