Section ALLOC.
Variable m1: mem.
Variables lo hi: Z.
Variable m2: mem.
Variable b: Values.block.
Hypothesis ALLOC: Mem.alloc m1 lo hi = (m2, b).
Transparent Mem.alloc.
Opaque Mem.alloc.

Lemma nextblock_freelist:
forall fbl m m',
Mem.free_list m fbl = Some m' ->
Mem.nextblock m' = Mem.nextblock m.