Refactor slightly to avoid a new clippy failure

src/git_tool.rs

@@ -136,7 +136,7 @@ pub struct Editor<'a> {
     run_editor: Box<dyn FnOnce(&Path) -> io::Result<bool> + 'a>,
 }
 
-impl<'a> Editor<'a> {
+impl Editor<'_> {
     /// Create a new editor for a temporary file.
     pub fn new(name: &str) -> io::Result<Self> {
         let tempfile = tempfile::Builder::new()
@@ -174,12 +174,6 @@ impl<'a> Editor<'a> {
         );
     }
 
-    #[cfg(test)]
-    /// Test-only method to mock out the actual invocation of the editor.
-    pub fn set_run_editor(&mut self, run_editor: impl FnOnce(&Path) -> io::Result<bool> + 'a) {
-        self.run_editor = Box::new(run_editor);
-    }
-
     /// Add comment lines to the editor. Any newlines in the input will be
     /// normalized to the current platform, and a comment character will be
     /// added.
@@ -260,6 +254,14 @@ impl<'a> Editor<'a> {
     }
 }
 
+#[cfg(test)]
+impl<'a> Editor<'a> {
+    /// Test-only method to mock out the actual invocation of the editor.
+    pub fn set_run_editor(&mut self, run_editor: impl FnOnce(&Path) -> io::Result<bool> + 'a) {
+        self.run_editor = Box::new(run_editor);
+    }
+}
+
 /// Read the git configuration to determine the value for GIT_EDITOR.
 fn git_pager() -> Option<String> {
     let output = Command::new("git")