diff --git a/src/exec/input.rs b/src/exec/input.rs
index 1026c17..d803eae 100644
--- a/src/exec/input.rs
+++ b/src/exec/input.rs
@@ -5,13 +5,13 @@ use crate::filesystem::strip_current_dir;
 
 /// Removes the parent component of the path
 pub fn basename(path: &Path) -> &OsStr {
-    path.file_name().unwrap_or(path.as_os_str())
+    path.file_name().unwrap_or_else(|| path.as_os_str())
 }
 
 /// Removes the extension from the path
 pub fn remove_extension(path: &Path) -> OsString {
     let dirname = dirname(path);
-    let stem = path.file_stem().unwrap_or(path.as_os_str());
+    let stem = path.file_stem().unwrap_or_else(|| path.as_os_str());
 
     let path = PathBuf::from(dirname).join(stem);
 
@@ -28,7 +28,7 @@ pub fn dirname(path: &Path) -> OsString {
                 p.as_os_str().to_owned()
             }
         })
-        .unwrap_or(path.as_os_str().to_owned())
+        .unwrap_or_else(|| path.as_os_str().to_owned())
 }
 
 #[cfg(test)]
diff --git a/src/exec/mod.rs b/src/exec/mod.rs
index 5da8807..129498a 100644
--- a/src/exec/mod.rs
+++ b/src/exec/mod.rs
@@ -201,7 +201,7 @@ impl ArgumentTemplate {
         }
     }
 
-    pub fn generate<'a>(&'a self, path: impl AsRef<Path>) -> OsString {
+    pub fn generate(&self, path: impl AsRef<Path>) -> OsString {
         use self::Token::*;
 
         match *self {
diff --git a/src/main.rs b/src/main.rs
index 4909743..377a698 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -65,9 +65,8 @@ fn run() -> Result<ExitCode> {
     let pattern = matches
         .value_of_os("pattern")
         .map(|p| {
-            p.to_str().ok_or(anyhow!(
-                "The search pattern includes invalid UTF-8 sequences."
-            ))
+            p.to_str()
+                .ok_or_else(|| anyhow!("The search pattern includes invalid UTF-8 sequences."))
         })
         .transpose()?
         .unwrap_or("");
@@ -122,7 +121,7 @@ fn run() -> Result<ExitCode> {
         ));
     }
 
-    let pattern_regex = if matches.is_present("glob") && pattern.len() > 0 {
+    let pattern_regex = if matches.is_present("glob") && !pattern.is_empty() {
         let glob = GlobBuilder::new(pattern).literal_separator(true).build()?;
         glob.regex().to_owned()
     } else if matches.is_present("fixed-strings") {
@@ -175,7 +174,13 @@ fn run() -> Result<ExitCode> {
         };
 
         let cmd: Vec<&str> = if cfg!(unix) {
-            if !cfg!(any(target_os = "macos", target_os = "dragonfly", target_os = "freebsd", target_os = "netbsd", target_os = "openbsd")) {
+            if !cfg!(any(
+                target_os = "macos",
+                target_os = "dragonfly",
+                target_os = "freebsd",
+                target_os = "netbsd",
+                target_os = "openbsd"
+            )) {
                 // Assume ls is GNU ls
                 gnu_ls("ls")
             } else {
@@ -239,10 +244,8 @@ fn run() -> Result<ExitCode> {
 
     let size_limits = if let Some(vs) = matches.values_of("size") {
         vs.map(|sf| {
-            SizeFilter::from_string(sf).ok_or(anyhow!(
-                "'{}' is not a valid size constraint. See 'fd --help'.",
-                sf
-            ))
+            SizeFilter::from_string(sf)
+                .ok_or_else(|| anyhow!("'{}' is not a valid size constraint. See 'fd --help'.", sf))
         })
         .collect::<Result<Vec<_>>>()?
     } else {
diff --git a/src/output.rs b/src/output.rs
index 175b1dd..d2737c6 100644
--- a/src/output.rs
+++ b/src/output.rs
@@ -11,7 +11,7 @@ use crate::exit_codes::ExitCode;
 use crate::filesystem::strip_current_dir;
 use crate::options::Options;
 
-pub fn replace_path_separator<'a>(path: &str, new_path_separator: &str) -> String {
+pub fn replace_path_separator(path: &str, new_path_separator: &str) -> String {
     path.replace(std::path::MAIN_SEPARATOR, &new_path_separator)
 }
 
diff --git a/tests/tests.rs b/tests/tests.rs
index d541304..8dedd61 100644
--- a/tests/tests.rs
+++ b/tests/tests.rs
@@ -9,9 +9,9 @@ use regex::escape;
 
 use crate::testenv::TestEnv;
 
-static DEFAULT_DIRS: &'static [&'static str] = &["one/two/three", "one/two/three/directory_foo"];
+static DEFAULT_DIRS: &[&str] = &["one/two/three", "one/two/three/directory_foo"];
 
-static DEFAULT_FILES: &'static [&'static str] = &[
+static DEFAULT_FILES: &[&str] = &[
     "a.foo",
     "one/b.foo",
     "one/two/c.foo",
@@ -88,18 +88,9 @@ fn test_empty_pattern() {
     one/two/three/directory_foo
     symlink";
 
-    te.assert_output(
-        &["--regex"],
-        expected,
-    );
-    te.assert_output(
-        &["--fixed-strings"],
-        expected,
-    );
-    te.assert_output(
-        &["--glob"],
-        expected,
-    );
+    te.assert_output(&["--regex"], expected);
+    te.assert_output(&["--fixed-strings"], expected);
+    te.assert_output(&["--glob"], expected);
 }
 
 /// Test multiple directory searches