module Weak:sig..end
Weak is like the OCaml standard library module of the same name, except that it
requires that the values in the weak set are heap blocks.type 'a t
val create : len:int -> 'a tval length : 'a t -> intval set : 'a t -> int -> 'a Heap_block.t option -> unitval get : 'a t -> int -> 'a Heap_block.t optionval sexp_of_t : ('a -> Sexplib.Sexp.t) -> 'a t -> Sexplib.Sexp.t