From 817c2cbbb5b266440efcf4a1aa1a750d79694be9 Mon Sep 17 00:00:00 2001
From: hi-rustin <rustin.liu@gmail.com>
Date: Tue, 19 Sep 2023 10:47:09 +0800
Subject: [PATCH] Better suggestion for unsupported mode in install command

---
 src/bin/cargo/commands/install.rs | 1 +
 src/cargo/util/command_prelude.rs | 2 +-
 tests/testsuite/install.rs        | 4 ++--
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/bin/cargo/commands/install.rs b/src/bin/cargo/commands/install.rs
index 010a4f48385..57063f11dc8 100644
--- a/src/bin/cargo/commands/install.rs
+++ b/src/bin/cargo/commands/install.rs
@@ -83,6 +83,7 @@ pub fn cli() -> Command {
             "debug",
             "Build in debug mode (with the 'dev' profile) instead of release mode",
         ))
+        .arg_unsupported_mode("release", "install", "debug")
         .arg_profile("Install artifacts with the specified profile")
         .arg_target_triple("Build for the target triple")
         .arg_target_dir()
diff --git a/src/cargo/util/command_prelude.rs b/src/cargo/util/command_prelude.rs
index 303f965a74e..270b558c6c2 100644
--- a/src/cargo/util/command_prelude.rs
+++ b/src/cargo/util/command_prelude.rs
@@ -525,7 +525,7 @@ Run `{cmd}` to see possible targets."
 
         let name = match (
             self.maybe_flag("release"),
-            self.flag("debug"),
+            self.maybe_flag("debug"),
             specified_profile,
         ) {
             (false, false, None) => default,
diff --git a/tests/testsuite/install.rs b/tests/testsuite/install.rs
index ccd9be49bf0..b49cbec315e 100644
--- a/tests/testsuite/install.rs
+++ b/tests/testsuite/install.rs
@@ -2453,9 +2453,9 @@ fn install_with_unsupported_mode() {
             "\
 error: unexpected argument '--release' found
 
-  tip: a similar argument exists: '--examples'
+  tip: There is no `--release` for `cargo install`. Only `--debug` is supported.
 
-Usage: cargo[EXE] install --examples [crate]...
+Usage: cargo[EXE] install [OPTIONS] [crate]...
 
 For more information, try '--help'.
 ",