MoptionSourceA Moption is a mutable option, like 'a option ref, but with a more efficient implementation; in particular, set_some does not allocate.
include Core.Invariant.S1 with type 'a t := 'a tmodule Optional_syntax :
Core.Optional_syntax.S1 with type 'a t := 'a t with type 'a value := 'aDoes not check that is_some before unsafely accessing the stored value