diff -r 5844cd8e81ca -r 37bc3edef76f rust/rhg/src/commands/debugrhgsparse.rs
--- a/rust/rhg/src/commands/debugrhgsparse.rs	Mon Nov 14 17:18:56 2022 +0100
+++ b/rust/rhg/src/commands/debugrhgsparse.rs	Tue Nov 15 00:02:43 2022 +0100
@@ -1,19 +1,21 @@
-use std::os::unix::prelude::OsStrExt;
+use std::{
+    ffi::{OsStr, OsString},
+    os::unix::prelude::OsStrExt,
+};
 
 use crate::error::CommandError;
-use clap::SubCommand;
 use hg::{self, utils::hg_path::HgPath};
 
 pub const HELP_TEXT: &str = "";
 
-pub fn args() -> clap::App<'static, 'static> {
-    SubCommand::with_name("debugrhgsparse")
+pub fn args() -> clap::Command {
+    clap::command!("debugrhgsparse")
         .arg(
-            clap::Arg::with_name("files")
+            clap::Arg::new("files")
+                .value_name("FILES")
                 .required(true)
-                .multiple(true)
-                .empty_values(false)
-                .value_name("FILES")
+                .num_args(1..)
+                .value_parser(clap::value_parser!(std::ffi::OsString))
                 .help("Files to check against sparse profile"),
         )
         .about(HELP_TEXT)
@@ -23,8 +25,12 @@
     let repo = invocation.repo?;
 
     let (matcher, _warnings) = hg::sparse::matcher(&repo).unwrap();
-    let files = invocation.subcommand_args.values_of_os("files");
+    let files = invocation.subcommand_args.get_many::<OsString>("files");
     if let Some(files) = files {
+        let files: Vec<&OsStr> = files
+            .filter(|s| !s.is_empty())
+            .map(|s| s.as_os_str())
+            .collect();
         for file in files {
             invocation.ui.write_stdout(b"matches: ")?;
             invocation.ui.write_stdout(