Fix anyhow_kind dispatch on owned value

src/kind.rs

@@ -42,7 +42,7 @@
 //     #[allow(unused_imports)]
 //     use $crate::private::{AdhocKind, TraitKind};
 //     let error = $msg;
-//     error.anyhow_kind().new(error)
+//     (&error).anyhow_kind().new(error)
 
 use crate::Error;
 use std::error::Error as StdError;

src/lib.rs

@@ -404,7 +404,7 @@ macro_rules! anyhow {
         #[allow(unused_imports)]
         use $crate::private::{AdhocKind, TraitKind};
         let error = $err;
-        error.anyhow_kind().new(error)
+        (&error).anyhow_kind().new(error)
     });
     ($fmt:expr, $($arg:tt)*) => {
         $crate::private::new_adhoc(format!($fmt, $($arg)*))

tests/test_source.rs

@@ -35,6 +35,10 @@ fn test_variable_source() {
     let msg = "oh no!";
     let error = anyhow!(msg);
     assert!(error.source().is_none());
+
+    let msg = msg.to_owned();
+    let error = anyhow!(msg);
+    assert!(error.source().is_none());
 }
 
 #[test]