message: Ignore clippy::not_unsafe_ptr_arg_deref lint
diff: // Catch documentation errors caused by code changes.
  #![deny(intra_doc_link_resolution_failure)]
  +// Clippy has a default-deny lint to prevent dereferencing raw pointer arguments
  +// in a non-unsafe function. However, declaring a function as unsafe has the
  +// side-effect that the entire function body is treated as an unsafe {} block,
  +// and rustc will not enforce full safety checks on the parts of the function
  +// that would otherwise be safe.
  +//
  +// The functions in this crate are all for FFI usage, so it's obvious to the
  +// caller (which is only ever zcashd) that the arguments must satisfy the
  +// necessary assumptions. We therefore ignore this lint to retain the benefit of
  +// explicitly annotating the parts of each function that must themselves satisfy
  +// assumptions of underlying code.
  +//
  +// See https://github.com/rust-lang/rfcs/pull/2585 for more background.
  +#![allow(clippy::not_unsafe_ptr_arg_deref)]
  use bellman::{
  gadgets::multipack,
  