diff --git a/ffi/src/helpers.rs b/ffi/src/helpers.rs
index 88ec77b..b9399fd 100644
--- a/ffi/src/helpers.rs
+++ b/ffi/src/helpers.rs
@@ -64,7 +64,7 @@ where
     } else {
         slice::from_raw_parts(array, array_size)
             .iter()
-            .map(|c| mapper(c))
+            .map(mapper)
             .collect()
     }
 }
diff --git a/src/function/eval.rs b/src/function/eval.rs
index 410f948..34a1e07 100644
--- a/src/function/eval.rs
+++ b/src/function/eval.rs
@@ -96,7 +96,7 @@ fn evaluate_is_master(state: &State, file_path: &Path) -> Result<bool, Error> {
 fn evaluate_many_active(state: &State, regex: &Regex) -> Result<bool, Error> {
     let mut found_one = false;
     for active_plugin in &state.active_plugins {
-        if regex.is_match(&active_plugin) {
+        if regex.is_match(active_plugin) {
             if found_one {
                 return Ok(true);
             } else {
@@ -256,10 +256,10 @@ impl Function {
     /// the operation is simple.
     fn is_slow(&self) -> bool {
         use Function::*;
-        match self {
-            ActivePath(_) | ActiveRegex(_) | ManyActive(_) | Checksum(_, _) => false,
-            _ => true,
-        }
+        !matches!(
+            self,
+            ActivePath(_) | ActiveRegex(_) | ManyActive(_) | Checksum(_, _)
+        )
     }
 }
 
diff --git a/src/function/parse.rs b/src/function/parse.rs
index 1d29062..33238da 100644
--- a/src/function/parse.rs
+++ b/src/function/parse.rs
@@ -134,7 +134,7 @@ fn parse_regex_path(input: &str) -> ParsingResult<(PathBuf, Regex)> {
     let (parent_path_slice, regex_slice) = string
         .rfind('/')
         .map(|i| (&string[..i], &string[i + 1..]))
-        .unwrap_or_else(|| (".", &string));
+        .unwrap_or_else(|| (".", string));
 
     let parent_path = PathBuf::from(parent_path_slice);
 
diff --git a/src/function/path.rs b/src/function/path.rs
index 1f80559..16b6244 100644
--- a/src/function/path.rs
+++ b/src/function/path.rs
@@ -45,9 +45,8 @@ fn add_ghost_extension(path: PathBuf) -> PathBuf {
     }
 }
 
-pub fn normalise_file_name<'a>(game_type: GameType, name: &'a str) -> &'a str {
-    if name.ends_with(GHOST_EXTENSION_WITH_PERIOD) {
-        let stem = &name[..name.len() - GHOST_EXTENSION_WITH_PERIOD.len()];
+pub fn normalise_file_name(game_type: GameType, name: &str) -> &str {
+    if let Some(stem) = name.strip_suffix(GHOST_EXTENSION_WITH_PERIOD) {
         if has_unghosted_plugin_file_extension(game_type, Path::new(stem)) {
             return stem;
         }
diff --git a/src/function/version.rs b/src/function/version.rs
index a333083..28e0d5c 100644
--- a/src/function/version.rs
+++ b/src/function/version.rs
@@ -15,7 +15,9 @@ enum ReleaseId {
 
 impl<'a> From<&'a str> for ReleaseId {
     fn from(string: &'a str) -> Self {
-        u32::from_str_radix(string.trim(), 10)
+        string
+            .trim()
+            .parse()
             .map(ReleaseId::Numeric)
             .unwrap_or_else(|_| ReleaseId::NonNumeric(string.to_lowercase()))
     }
@@ -24,7 +26,7 @@ impl<'a> From<&'a str> for ReleaseId {
 fn are_numeric_values_equal(n: u32, s: &str) -> bool {
     // The values can only be equal if the trimmed string can be wholly
     // converted to the same u32 value.
-    match u32::from_str_radix(s.trim(), 10) {
+    match s.trim().parse() {
         Ok(n2) => n == n2,
         Err(_) => false,
     }
@@ -55,11 +57,8 @@ fn u32_from_str(id: &str) -> (Option<u32>, usize) {
         // If the first byte is not a digit, there is no number to parse (this
         // ignores + and - signs).
         Some(0) => (None, id.len()),
-        Some(index) => (
-            u32::from_str_radix(id[..index].trim(), 10).ok(),
-            id.len() - index,
-        ),
-        None => (u32::from_str_radix(id.trim(), 10).ok(), 0),
+        Some(index) => (id[..index].trim().parse().ok(), id.len() - index),
+        None => (id.trim().parse().ok(), 0),
     }
 }
 
@@ -100,7 +99,9 @@ enum PreReleaseId {
 
 impl<'a> From<&'a str> for PreReleaseId {
     fn from(string: &'a str) -> Self {
-        u32::from_str_radix(string.trim(), 10)
+        string
+            .trim()
+            .parse()
             .map(PreReleaseId::Numeric)
             .unwrap_or_else(|_| PreReleaseId::NonNumeric(string.to_lowercase()))
     }