diff -r eace48b4a786 -r 184e46550dc8 rust/rhg/src/commands/root.rs
--- a/rust/rhg/src/commands/root.rs	Mon Feb 08 11:13:56 2021 +0100
+++ b/rust/rhg/src/commands/root.rs	Mon Feb 08 20:33:04 2021 +0100
@@ -1,6 +1,6 @@
-use crate::commands::Command;
 use crate::error::CommandError;
 use crate::ui::Ui;
+use clap::ArgMatches;
 use format_bytes::format_bytes;
 use hg::config::Config;
 use hg::repo::Repo;
@@ -12,19 +12,13 @@
 Returns 0 on success.
 ";
 
-pub struct RootCommand {}
-
-impl RootCommand {
-    pub fn new() -> Self {
-        RootCommand {}
-    }
+pub fn run(
+    ui: &Ui,
+    config: &Config,
+    _args: &ArgMatches,
+) -> Result<(), CommandError> {
+    let repo = Repo::find(config)?;
+    let bytes = get_bytes_from_path(repo.working_directory_path());
+    ui.write_stdout(&format_bytes!(b"{}\n", bytes.as_slice()))?;
+    Ok(())
 }
-
-impl Command for RootCommand {
-    fn run(&self, ui: &Ui, config: &Config) -> Result<(), CommandError> {
-        let repo = Repo::find(config)?;
-        let bytes = get_bytes_from_path(repo.working_directory_path());
-        ui.write_stdout(&format_bytes!(b"{}\n", bytes.as_slice()))?;
-        Ok(())
-    }
-}