fix: loosen lifetime constraint on mut_subcommand

src/builder/command.rs

@@ -298,10 +298,10 @@ impl<'help> App<'help> {
     /// assert!(res.is_ok());
     /// ```
     #[must_use]
-    pub fn mut_subcommand<T, F>(mut self, subcmd_id: T, f: F) -> Self
+    pub fn mut_subcommand<'a, T, F>(mut self, subcmd_id: T, f: F) -> Self
     where
         F: FnOnce(App<'help>) -> App<'help>,
-        T: Into<&'help str>,
+        T: Into<&'a str>,
     {
         let subcmd_id: &str = subcmd_id.into();
         let id = Id::from(subcmd_id);

tests/builder/tests.rs

@@ -445,6 +445,25 @@ fn mut_subcommand_all() {
     );
 }
 
+#[test]
+fn mut_subcommand_with_alias_resolve() {
+    let mut cmd =
+        Command::new("foo").subcommand(Command::new("bar").alias("baz").about("test subcmd"));
+    assert_eq!(
+        cmd.find_subcommand("baz").unwrap().get_about().unwrap(),
+        "test subcmd"
+    );
+
+    let true_name = cmd.find_subcommand("baz").unwrap().get_name().to_string();
+    assert_eq!(true_name, "bar");
+
+    cmd = cmd.mut_subcommand(&*true_name, |subcmd| subcmd.about("modified about"));
+    assert_eq!(
+        cmd.find_subcommand("baz").unwrap().get_about().unwrap(),
+        "modified about"
+    );
+}
+
 #[test]
 fn issue_3669_command_build_recurses() {
     let mut cmd = Command::new("ctest").subcommand(