Add better suggestion for the unsupported silent flag

src/bin/cargo/commands/vendor.rs

@@ -36,7 +36,7 @@ pub fn cli() -> Command {
  .arg(unsupported("relative-path"))
  .arg(unsupported("only-git-deps"))
  .arg(unsupported("disallow-duplicates"))
- .arg_quiet()
+ .arg_quiet_without_unknown_silent_arg_tip()
  .arg_manifest_path()
  .after_help(color_print::cstr!(
  "Run `<cyan,bold>cargo help vendor</>` for more detailed information.\n"

src/cargo/util/command_prelude.rs

@@ -331,6 +331,18 @@ pub trait CommandExt: Sized {
  }
 
  fn arg_quiet(self) -> Self {
+ let unsupported_silent_arg = {
+ let value_parser = UnknownArgumentValueParser::suggest_arg("--quiet");
+ flag("silent", "")
+ .short('s')
+ .value_parser(value_parser)
+ .hide(true)
+ };
+ self._arg(flag("quiet", "Do not print cargo log messages").short('q'))
+ ._arg(unsupported_silent_arg)
+ }
+
+ fn arg_quiet_without_unknown_silent_arg_tip(self) -> Self {
  self._arg(flag("quiet", "Do not print cargo log messages").short('q'))
  }
 

tests/testsuite/run.rs

@@ -37,6 +37,43 @@ fn quiet_arg() {
  .run();
 }
 
+#[cargo_test]
+fn unsupported_silent_arg() {
+ let p = project()
+ .file("src/main.rs", r#"fn main() { println!("hello"); }"#)
+ .build();
+
+ p.cargo("run -s")
+ .with_stderr(
+ "\
+error: unexpected argument '--silent' found
+
+ tip: a similar argument exists: '--quiet'
+
+Usage: cargo run [OPTIONS] [args]...
+
+For more information, try '--help'.
+",
+ )
+ .with_status(1)
+ .run();
+
+ p.cargo("run --silent")
+ .with_stderr(
+ "\
+error: unexpected argument '--silent' found
+
+ tip: a similar argument exists: '--quiet'
+
+Usage: cargo run [OPTIONS] [args]...
+
+For more information, try '--help'.
+",
+ )
+ .with_status(1)
+ .run();
+}
+
 #[cargo_test]
 fn quiet_arg_and_verbose_arg() {
  let p = project()