Temporarily allow clippy::result_unit_err lint

Fixing these lints is deferred to zcash/librustzcash#367.

zcash_client_backend/src/lib.rs

@@ -5,6 +5,8 @@
 
 // Catch documentation errors caused by code changes.
 #![deny(broken_intra_doc_links)]
+// Temporary until we have addressed all Result<T, ()> cases.
+#![allow(clippy::result_unit_err)]
 
 pub mod address;
 pub mod data_api;

zcash_primitives/src/lib.rs

@@ -6,6 +6,8 @@
 #![cfg_attr(docsrs, feature(doc_cfg))]
 // Catch documentation errors caused by code changes.
 #![deny(broken_intra_doc_links)]
+// Temporary until we have addressed all Result<T, ()> cases.
+#![allow(clippy::result_unit_err)]
 
 pub mod block;
 pub mod consensus;

zcash_proofs/src/lib.rs

@@ -6,6 +6,8 @@
 #![cfg_attr(docsrs, feature(doc_cfg))]
 // Catch documentation errors caused by code changes.
 #![deny(broken_intra_doc_links)]
+// Temporary until we have addressed all Result<T, ()> cases.
+#![allow(clippy::result_unit_err)]
 
 use bellman::groth16::{prepare_verifying_key, Parameters, PreparedVerifyingKey, VerifyingKey};
 use bls12_381::Bls12;