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 AllocContentsUndef1: forall z,
ZMap.get z (Mem.mem_contents m2) !! b = Undef.