diff --git a/ethers-core/src/utils/mod.rs b/ethers-core/src/utils/mod.rs
index 1a0b0c1b..e4c347af 100644
--- a/ethers-core/src/utils/mod.rs
+++ b/ethers-core/src/utils/mod.rs
@@ -493,8 +493,8 @@ mod tests {
         assert_eq!(parse_units("3_3_0", 3).unwrap(), U256::from(330000), "underscore");
         assert_eq!(parse_units("330", 0).unwrap(), U256::from(330), "zero decimals");
         assert_eq!(parse_units(".1234", 3).unwrap(), U256::from(123), "truncate too many decimals");
-        assert_eq!(parse_units("1", 80).is_err(), true, "overflow");
-        assert_eq!(parse_units("1", -1).is_err(), true, "neg units");
+        assert!(parse_units("1", 80).is_err(), "overflow");
+        assert!(parse_units("1", -1).is_err(), "neg units");
         let two_e30 = U256::from(2) * U256([0x4674edea40000000, 0xc9f2c9cd0, 0x0, 0x0]);
         assert_eq!(parse_units("2", 30).unwrap(), two_e30, "2e30");
         assert_eq!(parse_units(".33_319_2", 0).unwrap(), U256::zero(), "mix");
diff --git a/ethers-solc/src/compile/output/mod.rs b/ethers-solc/src/compile/output/mod.rs
index 1a73c794..15ffaed3 100644
--- a/ethers-solc/src/compile/output/mod.rs
+++ b/ethers-solc/src/compile/output/mod.rs
@@ -400,7 +400,9 @@ impl<T: ArtifactOutput> fmt::Display for ProjectCompileOutput<T> {
         if self.compiler_output.is_unchanged() {
             f.write_str("Nothing to compile")
         } else {
-            self.compiler_output.diagnostics(&self.ignored_error_codes, self.compiler_severity_filter.clone()).fmt(f)
+            self.compiler_output
+                .diagnostics(&self.ignored_error_codes, self.compiler_severity_filter.clone())
+                .fmt(f)
         }
     }
 }
@@ -428,15 +430,19 @@ impl AggregatedCompilerOutput {
     }
 
     /// Whether the output contains a compiler error
-    pub fn has_error(&self, ignored_error_codes: &[u64], compiler_severity_filter: &Severity) -> bool {
+    pub fn has_error(
+        &self,
+        ignored_error_codes: &[u64],
+        compiler_severity_filter: &Severity,
+    ) -> bool {
         self.errors.iter().any(|err| {
             if compiler_severity_filter.ge(&err.severity) {
-                if compiler_severity_filter.is_warning()  {
+                if compiler_severity_filter.is_warning() {
                     return self.has_warning(ignored_error_codes)
                 }
                 return true
             }
-            return false
+            false
         })
     }
 
@@ -451,7 +457,11 @@ impl AggregatedCompilerOutput {
         })
     }
 
-    pub fn diagnostics<'a>(&'a self, ignored_error_codes: &'a [u64], compiler_severity_filter: Severity) -> OutputDiagnostics {
+    pub fn diagnostics<'a>(
+        &'a self,
+        ignored_error_codes: &'a [u64],
+        compiler_severity_filter: Severity,
+    ) -> OutputDiagnostics {
         OutputDiagnostics { compiler_output: self, ignored_error_codes, compiler_severity_filter }
     }
 
@@ -719,7 +729,7 @@ pub struct OutputDiagnostics<'a> {
 impl<'a> OutputDiagnostics<'a> {
     /// Returns true if there is at least one error of high severity
     pub fn has_error(&self) -> bool {
-        self.compiler_output.has_error(&self.ignored_error_codes, &self.compiler_severity_filter)
+        self.compiler_output.has_error(self.ignored_error_codes, &self.compiler_severity_filter)
     }
 
     /// Returns true if there is at least one warning
diff --git a/ethers-solc/src/compile/project.rs b/ethers-solc/src/compile/project.rs
index 3994da3b..1233ba75 100644
--- a/ethers-solc/src/compile/project.rs
+++ b/ethers-solc/src/compile/project.rs
@@ -311,7 +311,8 @@ impl<'a, T: ArtifactOutput> CompiledState<'a, T> {
                 ctx,
                 &project.paths,
             )
-        } else if output.has_error(&project.ignored_error_codes, &project.compiler_severity_filter) {
+        } else if output.has_error(&project.ignored_error_codes, &project.compiler_severity_filter)
+        {
             trace!("skip writing cache file due to solc errors: {:?}", output.errors);
             project.artifacts_handler().output_to_artifacts(
                 &output.contracts,
@@ -361,14 +362,15 @@ impl<'a, T: ArtifactOutput> ArtifactsState<'a, T> {
         let project = cache.project();
         let ignored_error_codes = project.ignored_error_codes.clone();
         let compiler_severity_filter = project.compiler_severity_filter.clone();
-        let skip_write_to_disk = project.no_artifacts || output.has_error(&ignored_error_codes, &compiler_severity_filter);
+        let skip_write_to_disk = project.no_artifacts ||
+            output.has_error(&ignored_error_codes, &compiler_severity_filter);
         let cached_artifacts = cache.consume(&compiled_artifacts, !skip_write_to_disk)?;
         Ok(ProjectCompileOutput {
             compiler_output: output,
             compiled_artifacts,
             cached_artifacts,
             ignored_error_codes,
-            compiler_severity_filter
+            compiler_severity_filter,
         })
     }
 }
diff --git a/ethers-solc/tests/project.rs b/ethers-solc/tests/project.rs
index 6f99e982..84bc9bfb 100644
--- a/ethers-solc/tests/project.rs
+++ b/ethers-solc/tests/project.rs
@@ -1623,8 +1623,8 @@ fn test_compiler_severity_filter() {
     fn gen_test_data_warning_path() -> ProjectPathsConfig {
         let root =
             PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("test-data/test-contract-warnings");
-        let paths = ProjectPathsConfig::builder().sources(root).build().unwrap();
-        paths
+
+        ProjectPathsConfig::builder().sources(root).build().unwrap()
     }
 
     let project = Project::builder()
@@ -1652,20 +1652,20 @@ fn test_compiler_severity_filter() {
 #[test]
 fn test_compiler_severity_filter_and_ignored_error_codes() {
     fn gen_test_data_licensing_warning() -> ProjectPathsConfig {
-        let root =
-            PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("test-data/test-contract-warnings/LicenseWarning.sol");
-        let paths = ProjectPathsConfig::builder().sources(root).build().unwrap();
-        paths
+        let root = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+            .join("test-data/test-contract-warnings/LicenseWarning.sol");
+
+        ProjectPathsConfig::builder().sources(root).build().unwrap()
     }
 
     let missing_license_error_code = 1878;
 
     let project = Project::builder()
-    .no_artifacts()
-    .paths(gen_test_data_licensing_warning())
-    .ephemeral()
-    .build()
-    .unwrap();
+        .no_artifacts()
+        .paths(gen_test_data_licensing_warning())
+        .ephemeral()
+        .build()
+        .unwrap();
     let compiled = project.compile().unwrap();
     assert!(compiled.has_compiler_warnings());
 
@@ -1681,13 +1681,13 @@ fn test_compiler_severity_filter_and_ignored_error_codes() {
     assert!(!compiled.has_compiler_errors());
 
     let project = Project::builder()
-    .no_artifacts()
-    .paths(gen_test_data_licensing_warning())
-    .ephemeral()
-    .ignore_error_code(missing_license_error_code)
-    .set_compiler_severity_filter(ethers_solc::artifacts::Severity::Warning)
-    .build()
-    .unwrap();
+        .no_artifacts()
+        .paths(gen_test_data_licensing_warning())
+        .ephemeral()
+        .ignore_error_code(missing_license_error_code)
+        .set_compiler_severity_filter(ethers_solc::artifacts::Severity::Warning)
+        .build()
+        .unwrap();
     let compiled = project.compile().unwrap();
     assert!(!compiled.has_compiler_warnings());
     assert!(!compiled.has_compiler_errors());