diff -r eace48b4a786 -r 184e46550dc8 rust/rhg/src/commands/debugrequirements.rs
--- a/rust/rhg/src/commands/debugrequirements.rs	Mon Feb 08 11:13:56 2021 +0100
+++ b/rust/rhg/src/commands/debugrequirements.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 hg::config::Config;
 use hg::repo::Repo;
 
@@ -8,25 +8,19 @@
 Print the current repo requirements.
 ";
 
-pub struct DebugRequirementsCommand {}
-
-impl DebugRequirementsCommand {
-    pub fn new() -> Self {
-        DebugRequirementsCommand {}
+pub fn run(
+    ui: &Ui,
+    config: &Config,
+    _args: &ArgMatches,
+) -> Result<(), CommandError> {
+    let repo = Repo::find(config)?;
+    let mut output = String::new();
+    let mut requirements: Vec<_> = repo.requirements().iter().collect();
+    requirements.sort();
+    for req in requirements {
+        output.push_str(req);
+        output.push('\n');
     }
+    ui.write_stdout(output.as_bytes())?;
+    Ok(())
 }
-
-impl Command for DebugRequirementsCommand {
-    fn run(&self, ui: &Ui, config: &Config) -> Result<(), CommandError> {
-        let repo = Repo::find(config)?;
-        let mut output = String::new();
-        let mut requirements: Vec<_> = repo.requirements().iter().collect();
-        requirements.sort();
-        for req in requirements {
-            output.push_str(req);
-            output.push('\n');
-        }
-        ui.write_stdout(output.as_bytes())?;
-        Ok(())
-    }
-}