Bump clippy msrv to 1.64

the msrv was bumped in in the Cargo.toml #847 but not in clippy.toml,
clippy was complaining at startup and defaulting to 1.57

.clippy.toml

@@ -1,2 +1,2 @@
 # Specify the minimum supported Rust version
-msrv = "1.57.0"
+msrv = "1.64.0"

src/bindgen/config.rs

@@ -61,8 +61,10 @@ impl Language {
 /// Controls what type of line endings are used in the generated code.
 #[derive(Debug, Clone, Copy)]
 #[allow(clippy::upper_case_acronyms)]
+#[derive(Default)]
 pub enum LineEndingStyle {
     /// Use Unix-style linefeed characters
+    #[default]
     LF,
     /// Use classic Mac-style carriage-return characters
     CR,
@@ -72,12 +74,6 @@ pub enum LineEndingStyle {
     Native,
 }
 
-impl Default for LineEndingStyle {
-    fn default() -> Self {
-        LineEndingStyle::LF
-    }
-}
-
 impl LineEndingStyle {
     pub fn as_str(&self) -> &'static str {
         match self {
@@ -213,8 +209,9 @@ impl FromStr for DocumentationLength {
 deserialize_enum_str!(DocumentationLength);
 
 /// A style of Style to use when generating structs and enums.
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Default)]
 pub enum Style {
+    #[default]
     Both,
     Tag,
     Type,
@@ -245,12 +242,6 @@ impl Style {
     }
 }
 
-impl Default for Style {
-    fn default() -> Self {
-        Style::Both
-    }
-}
-
 impl FromStr for Style {
     type Err = String;
 

src/bindgen/ir/repr.rs

@@ -6,19 +6,14 @@ use syn::ext::IdentExt;
 
 use crate::bindgen::ir::ty::{IntKind, PrimitiveType};
 
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Default)]
 pub enum ReprStyle {
+    #[default]
     Rust,
     C,
     Transparent,
 }
 
-impl Default for ReprStyle {
-    fn default() -> Self {
-        ReprStyle::Rust
-    }
-}
-
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub struct ReprType {
     kind: IntKind,

src/bindgen/rename.rs

@@ -28,9 +28,10 @@ impl<'a> IdentifierType<'a> {
 }
 
 /// A rule to apply to an identifier when generating bindings.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, Default)]
 pub enum RenameRule {
     /// Do not apply any renaming. The default.
+    #[default]
     None,
     /// Converts the identifier to PascalCase and adds a context dependent prefix
     GeckoCase,
@@ -93,12 +94,6 @@ impl RenameRule {
     }
 }
 
-impl Default for RenameRule {
-    fn default() -> RenameRule {
-        RenameRule::None
-    }
-}
-
 impl FromStr for RenameRule {
     type Err = String;
 

tests/depfile.rs

@@ -93,7 +93,6 @@ fn test_project(project_path: &str) {
     );
 
     std::fs::remove_dir_all(build_dir).expect("Failed to remove old build directory");
-    ()
 }
 
 macro_rules! test_file {

tests/tests.rs

@@ -251,7 +251,7 @@ fn run_compile_test(
     );
     if generate_depfile {
         let depfile = depfile_contents.expect("No depfile generated");
-        assert!(depfile.len() > 0);
+        assert!(!depfile.is_empty());
         let mut rules = depfile.split(':');
         let target = rules.next().expect("No target found");
         assert_eq!(target, generated_file.as_os_str().to_str().unwrap());