style: Make clippy happy

clap_builder/src/util/color.rs

@@ -2,7 +2,7 @@ use crate::builder::PossibleValue;
 use crate::derive::ValueEnum;
 
 /// Represents the color preferences for program output
-#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Default)]
 pub enum ColorChoice {
     /// Enables colored output only when the output is going to a terminal or TTY.
     ///
@@ -23,6 +23,7 @@ pub enum ColorChoice {
     ///     .get_matches();
     /// # }
     /// ```
+    #[default]
     Auto,
 
     /// Enables colored output regardless of whether or not the output is going to a terminal/TTY.
@@ -65,12 +66,6 @@ impl ColorChoice {
     }
 }
 
-impl Default for ColorChoice {
-    fn default() -> Self {
-        Self::Auto
-    }
-}
-
 impl std::fmt::Display for ColorChoice {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         self.to_possible_value()

examples/tutorial_builder/04_04_custom.rs

@@ -37,7 +37,7 @@ fn main() {
             )
             .exit();
         }
-        ver.to_string()
+        ver.clone()
     } else {
         // Increment the one requested (in a real program, we'd reset the lower numbers)
         let (maj, min, pat) = (

tests/derive/value_enum.rs

@@ -41,16 +41,14 @@ fn basic() {
 #[test]
 fn default_value() {
     #[derive(clap::ValueEnum, PartialEq, Debug, Clone)]
+    #[derive(Default)]
     enum ArgChoice {
         Foo,
+        #[default]
         Bar,
     }
 
-    impl Default for ArgChoice {
-        fn default() -> Self {
-            Self::Bar
-        }
-    }
+    
 
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {