diff --git a/proto/src/lib.rs b/proto/src/lib.rs
index ede040640..0cfb74baa 100644
--- a/proto/src/lib.rs
+++ b/proto/src/lib.rs
@@ -32,11 +32,11 @@ include!("codegen/google.crypto.tink.rs");
 #[cfg(feature = "json")]
 include!("codegen/serde/google.crypto.tink.rs");
 
+// Manual keyset serialization implementations that map enums onto strings rather than
+// the `i32` values used by [prost](https://docs.rs/prost).
 #[cfg(feature = "json")]
 #[cfg_attr(docsrs, doc(cfg(feature = "json")))]
 pub mod json {
-    //! Manual keyset serialization implementations that map enums onto strings rather than
-    //! the `i32` values used by [prost](https://docs.rs/prost).
     pub mod key_status_type {
         //! Manual JSON serialization for [`KeyStatusType`](crate::KeyStatusType) enums.
         use serde::Deserialize;
diff --git a/signature/src/subtle/ecdsa_signer.rs b/signature/src/subtle/ecdsa_signer.rs
index 240734747..53fcff0d1 100644
--- a/signature/src/subtle/ecdsa_signer.rs
+++ b/signature/src/subtle/ecdsa_signer.rs
@@ -17,7 +17,6 @@
 use generic_array::typenum::Unsigned;
 use p256::elliptic_curve;
 use signature::RandomizedSigner;
-use std::convert::TryInto;
 use tink_core::{utils::wrap_err, TinkError};
 use tink_proto::{EcdsaSignatureEncoding, EllipticCurveType, HashType};
 
@@ -63,12 +62,8 @@ impl EcdsaSigner {
                     return Err("EcdsaSigner: invalid private key len".into());
                 }
                 EcdsaPrivateKey::NistP256(
-                    p256::ecdsa::SigningKey::from_bytes(
-                        key_value
-                            .try_into()
-                            .map_err(|e| wrap_err("EcdsaSigner: invalid private key", e))?,
-                    )
-                    .map_err(|e| wrap_err("EcdsaSigner: invalid private key", e))?,
+                    p256::ecdsa::SigningKey::from_bytes(key_value.into())
+                        .map_err(|e| wrap_err("EcdsaSigner: invalid private key", e))?,
                 )
             }
             _ => return Err(format!("EcdsaSigner: unsupported curve {curve:?}").into()),
diff --git a/testing/src/main.rs b/testing/src/main.rs
index 0082b16ce..9574a07c7 100644
--- a/testing/src/main.rs
+++ b/testing/src/main.rs
@@ -21,9 +21,9 @@ use log::info;
 use structopt::StructOpt;
 use tonic::transport::Server;
 
-#[allow(clippy::wrong_self_convention)]
 pub mod proto {
     //! Auto-generated code from protocol buffer message and service definitions.
+    #![allow(clippy::wrong_self_convention)]
     #![allow(clippy::large_enum_variant)]
     #![allow(clippy::derive_partial_eq_without_eq)]
     include!("codegen/tink_testing_api.rs");
diff --git a/tests/src/testdata.rs b/tests/src/testdata.rs
index 5da1a18ab..6d40a2754 100644
--- a/tests/src/testdata.rs
+++ b/tests/src/testdata.rs
@@ -42,7 +42,7 @@ pub fn key_template_proto(dir: &str, name: &str) -> Result<KeyTemplate, TinkErro
     let value_re = Regex::new(r#"^\s*value\s*:\s*"(.+)"\s*$"#).unwrap();
     let prefix_re = Regex::new(r#"^\s*output_prefix_type\s*:\s*(\S+)\s*$"#).unwrap();
     let file = std::fs::File::open(&path).map_err(|e| wrap_err("Failed to open", e))?;
-    for line in std::io::BufReader::new(file).lines().flatten() {
+    for line in std::io::BufReader::new(file).lines().map_while(Result::ok) {
         if comment_re.is_match(&line) {
             continue;
         }
diff --git a/tests/tests/aead/subtle/wycheproof.rs b/tests/tests/aead/subtle/wycheproof.rs
index ce4db490f..529185563 100644
--- a/tests/tests/aead/subtle/wycheproof.rs
+++ b/tests/tests/aead/subtle/wycheproof.rs
@@ -27,6 +27,7 @@ pub struct TestData {
     pub test_groups: Vec<TestGroup>,
 }
 
+#[allow(dead_code)]
 #[derive(Debug, Deserialize)]
 pub struct TestGroup {
     #[serde(flatten)]
diff --git a/tests/tests/daead/factory_test.rs b/tests/tests/daead/factory_test.rs
index fa46cf4d0..ed79bc66a 100644
--- a/tests/tests/daead/factory_test.rs
+++ b/tests/tests/daead/factory_test.rs
@@ -88,13 +88,13 @@ fn test_factory_raw_key_as_primary() {
 
 // Return an `Err` if decryption fails, panic if something else goes wrong.
 #[allow(clippy::borrowed_box)]
-fn validate_daead_factory_cipher<T: ?Sized>(
+fn validate_daead_factory_cipher<T>(
     encrypt_cipher: &Box<T>,
     decrypt_cipher: &Box<T>,
     expected_prefix: &[u8],
 ) -> Result<(), TinkError>
 where
-    T: tink_core::DeterministicAead,
+    T: tink_core::DeterministicAead + ?Sized,
 {
     let prefix_size = expected_prefix.len();
     // regular plaintext.
diff --git a/tests/tests/mac/subtle/cmac_test.rs b/tests/tests/mac/subtle/cmac_test.rs
index 1fbcb684b..00f3f7fd6 100644
--- a/tests/tests/mac/subtle/cmac_test.rs
+++ b/tests/tests/mac/subtle/cmac_test.rs
@@ -34,6 +34,7 @@ lazy_static! {
     };
 }
 
+#[allow(dead_code)]
 #[derive(Debug, Deserialize)]
 pub struct TestData {
     #[serde(flatten)]
@@ -42,6 +43,7 @@ pub struct TestData {
     pub test_groups: Vec<TestGroup>,
 }
 
+#[allow(dead_code)]
 #[derive(Debug, Deserialize)]
 pub struct TestGroup {
     #[serde(flatten)]
diff --git a/tests/tests/prf/subtle/aes_cmac_test.rs b/tests/tests/prf/subtle/aes_cmac_test.rs
index c7f606f7b..28d8e8a35 100644
--- a/tests/tests/prf/subtle/aes_cmac_test.rs
+++ b/tests/tests/prf/subtle/aes_cmac_test.rs
@@ -43,6 +43,7 @@ fn test_vectors_rfc4493() {
     }
 }
 
+#[allow(dead_code)]
 #[derive(Debug, Deserialize)]
 pub struct TestData {
     #[serde(flatten)]
@@ -51,6 +52,7 @@ pub struct TestData {
     pub test_groups: Vec<TestGroup>,
 }
 
+#[allow(dead_code)]
 #[derive(Debug, Deserialize)]
 pub struct TestGroup {
     #[serde(flatten)]
diff --git a/tests/tests/signature/ecdsa_signer_key_manager_test.rs b/tests/tests/signature/ecdsa_signer_key_manager_test.rs
index 31587da87..936243c53 100644
--- a/tests/tests/signature/ecdsa_signer_key_manager_test.rs
+++ b/tests/tests/signature/ecdsa_signer_key_manager_test.rs
@@ -106,7 +106,7 @@ fn test_ecdsa_sign_new_key_with_invalid_input() {
     let km = tink_core::registry::get_key_manager(tink_tests::ECDSA_SIGNER_TYPE_URL)
         .expect("cannot obtain EcdsaSigner key manager");
     // invalid hash and curve type
-    let test_params = vec![
+    let test_params = [
         EcdsaParams {
             hash_type: HashType::UnknownHash as i32,
             curve: EllipticCurveType::NistP256 as i32,