diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index db497941642..45f63b83c05 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -40,6 +40,10 @@ jobs:
         rustc -Vv
         cargo -V
         cargo build
+      env:
+        RUSTFLAGS: '-D warnings'
 
     - name: test
       run: cargo test
+      env:
+        RUSTFLAGS: '-D warnings'
diff --git a/src/ignore_path.rs b/src/ignore_path.rs
index 7738eee0a76..d955949496a 100644
--- a/src/ignore_path.rs
+++ b/src/ignore_path.rs
@@ -32,16 +32,15 @@ impl IgnorePathSet {
 
 #[cfg(test)]
 mod test {
-    use std::path::{Path, PathBuf};
-
-    use crate::config::{Config, FileName};
-    use crate::ignore_path::IgnorePathSet;
-
     use rustfmt_config_proc_macro::nightly_only_test;
 
     #[nightly_only_test]
     #[test]
     fn test_ignore_path_set() {
+        use crate::config::{Config, FileName};
+        use crate::ignore_path::IgnorePathSet;
+        use std::path::{Path, PathBuf};
+
         let config =
             Config::from_toml(r#"ignore = ["foo.rs", "bar_dir/*"]"#, Path::new("")).unwrap();
         let ignore_path_set = IgnorePathSet::from_ignore_list(&config.ignore()).unwrap();
diff --git a/src/lib.rs b/src/lib.rs
index fae8080c02e..ad23b16e02e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,7 +3,6 @@
 #![warn(unreachable_pub)]
 #![recursion_limit = "256"]
 #![allow(clippy::match_like_matches_macro)]
-#![allow(unreachable_pub)]
 
 #[macro_use]
 extern crate derive_new;