From 71adf02435464dfb638f0b45d0caddaab03e318f Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Tue, 5 Nov 2024 17:02:31 -0500
Subject: [PATCH] Add test of transparent variant in enum with format args

    error: cannot have both #[error(transparent)] and a display attribute
      --> tests/test_transparent.rs:51:5
       |
    51 |     #[error("this failed: {0}_{1}")]
       |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
---
 tests/test_transparent.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tests/test_transparent.rs b/tests/test_transparent.rs
index 6f3c03e..ee30f5b 100644
--- a/tests/test_transparent.rs
+++ b/tests/test_transparent.rs
@@ -45,6 +45,24 @@ fn test_transparent_enum() {
     assert_eq!("inner", error.source().unwrap().to_string());
 }
 
+#[test]
+fn test_transparent_enum_with_default_message() {
+    #[derive(Error, Debug)]
+    #[error("this failed: {0}_{1}")]
+    enum Error {
+        This(i32, i32),
+        #[error(transparent)]
+        Other(anyhow::Error),
+    }
+
+    let error = Error::This(-1, -1);
+    assert_eq!("this failed: -1_-1", error.to_string());
+
+    let error = Error::Other(anyhow!("inner").context("outer"));
+    assert_eq!("outer", error.to_string());
+    assert_eq!("inner", error.source().unwrap().to_string());
+}
+
 #[test]
 fn test_anyhow() {
     #[derive(Error, Debug)]