Make XmlError be Send and Sync

Author: andy128k

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Fix a regression: make `Error` and `XmlError` be `Send` and `Sync` again [`#89`](https://github.com/rust-syndication/atom/pull/89)
+
 ## 0.12.5 - 2024-11-16
 
 - Remove ambiguous statements about escaping from documentation. [`#85`](https://github.com/rust-syndication/atom/pull/85)

src/error.rs

@@ -64,10 +64,10 @@ impl From<XmlError> for Error {
 }
 
 #[derive(Debug)]
-pub struct XmlError(Box<dyn StdError>);
+pub struct XmlError(Box<dyn StdError + Send + Sync>);
 
 impl XmlError {
-    pub(crate) fn new(err: impl StdError + 'static) -> Self {
+    pub(crate) fn new(err: impl StdError + Send + Sync + 'static) -> Self {
         Self(Box::new(err))
     }
 }
@@ -83,3 +83,15 @@ impl fmt::Display for XmlError {
         fmt::Display::fmt(&self.0, f)
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn error_send_and_sync() {
+        fn assert_send_sync<T: Send + Sync>() {}
+        assert_send_sync::<Error>();
+        assert_send_sync::<XmlError>();
+    }
+}