From b2df5d55ec626bc02b1c4706608bbadaa530e283 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Mon, 4 Nov 2024 16:29:55 -0500
Subject: [PATCH] Add test of r#source that is not Error::source

Without r#source:

    error[E0599]: the method `as_dyn_error` exists for type `char`, but its trait bounds were not satisfied
      --> tests/test_source.rs:72:9
       |
    72 |         source: char,
       |         ^^^^^^ method cannot be called on `char` due to unsatisfied trait bounds
       |
       = note: the following trait bounds were not satisfied:
               `char: std::error::Error`
               which is required by `char: AsDynError<'_>`
---
 tests/test_source.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tests/test_source.rs b/tests/test_source.rs
index 637f4ac0..29968bee 100644
--- a/tests/test_source.rs
+++ b/tests/test_source.rs
@@ -63,3 +63,20 @@ error_from_macro! {
     #[error("Something")]
     Variant(#[from] io::Error)
 }
+
+#[test]
+fn test_not_source() {
+    #[derive(Error, Debug)]
+    #[error("{source} ==> {destination}")]
+    pub struct NotSource {
+        r#source: char,
+        destination: char,
+    }
+
+    let error = NotSource {
+        source: 'S',
+        destination: 'D',
+    };
+    assert_eq!(error.to_string(), "S ==> D");
+    assert!(error.source().is_none());
+}