1 files changed, 8 insertions, 1 deletions
diff --git a/src/aserror.rs b/src/aserror.rs
index c036b7b..5fea84e 100644
--- a/src/aserror.rs
+++ b/src/aserror.rs
@@ -1,7 +1,7 @@
 use std::error::Error;
 use std::panic::UnwindSafe;
 
-pub trait AsDynError<'a> {
+pub trait AsDynError<'a>: Sealed {
     fn as_dyn_error(&self) -> &(dyn Error + 'a);
 }
 
@@ -39,3 +39,10 @@ impl<'a> AsDynError<'a> for dyn Error + Send + Sync + UnwindSafe + 'a {
         self
     }
 }
+
+pub trait Sealed {}
+impl<'a, T: Error + 'a> Sealed for T {}
+impl<'a> Sealed for dyn Error + 'a {}
+impl<'a> Sealed for dyn Error + Send + 'a {}
+impl<'a> Sealed for dyn Error + Send + Sync + 'a {}
+impl<'a> Sealed for dyn Error + Send + Sync + UnwindSafe + 'a {}