From 8d143cc92eac7f241f9b9fe56fed2b15b50ca2cb Mon Sep 17 00:00:00 2001
From: Scott Schafer <schaferjscott@gmail.com>
Date: Fri, 2 Jun 2023 11:29:18 -0500
Subject: [PATCH] test(z-flags): Verify `-Z` flags list is sorted

---
 src/cargo/core/features.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/cargo/core/features.rs b/src/cargo/core/features.rs
index fa63be96eb2..e9cb7bcc0a9 100644
--- a/src/cargo/core/features.rs
+++ b/src/cargo/core/features.rs
@@ -687,6 +687,26 @@ macro_rules! unstable_cli_options {
                 fields
             }
         }
+
+        #[cfg(test)]
+        mod test {
+            #[test]
+            fn ensure_sorted() {
+                // This will be printed out if the fields are not sorted.
+                let location = std::panic::Location::caller();
+                println!(
+                    "\nTo fix this test, sort the features inside the macro at {}:{}\n",
+                    location.file(),
+                    location.line()
+                );
+                let mut expected = vec![$(stringify!($element)),*];
+                expected[2..].sort();
+                snapbox::assert_eq(
+                    format!("{:#?}", expected),
+                    format!("{:#?}", vec![$(stringify!($element)),*])
+                );
+            }
+        }
     }
 }