diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 5c2da0c..1e4cae0 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -17,6 +17,6 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Build
-      run: cargo build --verbose
+      run: cargo build --verbose --all-features
     - name: Run tests
-      run: cargo test --verbose
+      run: cargo test --verbose --all-features
diff --git a/README.md b/README.md
index 8a7d56a..340ecef 100644
--- a/README.md
+++ b/README.md
@@ -270,8 +270,8 @@ Supported character sets via the optional dependency [encoding_rs](https://crate
 
 Licensed under either of
 
- * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
- * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+ * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
 
 at your option.
 
diff --git a/src/core/mod.rs b/src/core/mod.rs
index 541addd..f8ed003 100644
--- a/src/core/mod.rs
+++ b/src/core/mod.rs
@@ -4,10 +4,10 @@
  * SPDX-License-Identifier: Apache-2.0 OR MIT
  */
 
-pub mod address;
-pub mod body;
-pub mod builder;
-pub mod header;
-pub mod message;
+mod address;
+mod body;
+mod builder;
+mod header;
+mod message;
 #[cfg(feature = "rkyv")]
 pub mod rkyv;
diff --git a/src/decoders/charsets/mod.rs b/src/decoders/charsets/mod.rs
index cd8a61f..3c3f422 100644
--- a/src/decoders/charsets/mod.rs
+++ b/src/decoders/charsets/mod.rs
@@ -5,9 +5,9 @@
  */
 
 pub mod map;
-pub mod multi_byte;
-pub mod single_byte;
-pub mod utf;
+mod multi_byte;
+mod single_byte;
+mod utf;
 
 pub type DecoderFnc = fn(&[u8]) -> String;
 
diff --git a/src/decoders/encoded_word.rs b/src/decoders/encoded_word.rs
index 61138dc..fc3adfe 100644
--- a/src/decoders/encoded_word.rs
+++ b/src/decoders/encoded_word.rs
@@ -167,7 +167,7 @@ mod tests {
                     //println!("Decoded '{}'", string);
                     assert_eq!(result, expected_result);
                 }
-                _ => panic!("Failed to decode '{}'", input),
+                _ => panic!("Failed to decode '{input}'"),
             }
         }
     }
diff --git a/src/decoders/mod.rs b/src/decoders/mod.rs
index e5f8a28..8a6b0bd 100644
--- a/src/decoders/mod.rs
+++ b/src/decoders/mod.rs
@@ -10,7 +10,7 @@ use crate::parsers::MessageStream;
 
 pub mod base64;
 pub mod charsets;
-pub mod encoded_word;
+mod encoded_word;
 pub mod hex;
 pub mod html;
 pub mod quoted_printable;
diff --git a/src/lib.rs b/src/lib.rs
index ea84deb..26af548 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,7 +5,7 @@
  */
 #![doc = include_str!("../README.md")]
 #![deny(rust_2018_idioms)]
-#[forbid(unsafe_code)]
+#![forbid(unsafe_code)]
 pub mod core;
 pub mod decoders;
 pub mod mailbox;
diff --git a/src/parsers/fields/mod.rs b/src/parsers/fields/mod.rs
index 299c059..a663393 100644
--- a/src/parsers/fields/mod.rs
+++ b/src/parsers/fields/mod.rs
@@ -5,14 +5,14 @@
  */
 
 pub mod address;
-pub mod content_type;
+mod content_type;
 pub mod date;
-pub mod id;
-pub mod list;
-pub mod raw;
-pub mod received;
+mod id;
+mod list;
+mod raw;
+mod received;
 pub mod thread;
-pub mod unstructured;
+mod unstructured;
 
 #[cfg(test)]
 use serde::{Deserialize, Serialize};
diff --git a/src/parsers/fields/raw.rs b/src/parsers/fields/raw.rs
index e81dcb4..f427f00 100644
--- a/src/parsers/fields/raw.rs
+++ b/src/parsers/fields/raw.rs
@@ -79,8 +79,7 @@ mod tests {
                     .parse_raw()
                     .unwrap_text(),
                 expected,
-                "Failed for '{:?}'",
-                input
+                "Failed for '{input:?}'"
             );
         }
     }
diff --git a/src/parsers/mod.rs b/src/parsers/mod.rs
index 0f2574a..6fe0e74 100644
--- a/src/parsers/mod.rs
+++ b/src/parsers/mod.rs
@@ -7,9 +7,9 @@
 use std::{iter::Peekable, ops::Range, slice::Iter};
 
 pub mod fields;
-pub mod header;
-pub mod message;
-pub mod mime;
+mod header;
+mod message;
+mod mime;
 pub mod preview;
 
 pub struct MessageStream<'x> {