`clippy_utils::ty::InteriorMut::interior_mut_ty_chain` must stop
recursing forever when types are chained indefinitely due to the use of
associated types in generics. A false negative is acceptable, and
documented here.
Should this situation be later identified specifically, a conversion of
`Option` to `Result` would allow separating the infinitely recursive
case from a negative one.
Samuel Tardieu
1ae37ada08