wip

core/any_error.rs

@@ -3,12 +3,12 @@ use std::convert::From;
 use std::error::Error;
 
 #[allow(dead_code)]
-pub type BoxError = Box<dyn AnyError + Sync>;
+pub type BoxError = Box<dyn AnyError>;
 #[allow(dead_code)]
 pub type DynError<'a> = &'a dyn AnyError;
 
-pub trait AnyError: Error + Any + Send + Sync + 'static {}
-impl<T> AnyError for T where T: Error + Any + Send + Sync + Sized + 'static {}
+pub trait AnyError: Error + Any + Send + 'static {}
+impl<T> AnyError for T where T: Error + Any + Send + Sized + 'static {}
 
 impl<T> From<T> for Box<dyn AnyError>
 where
@@ -46,6 +46,21 @@ pub trait DowncastErrorRef: Sized {
     T: AnyError + Sized;
 }
 
+impl DowncastErrorRef for Box<dyn AnyError> {
+  fn downcast_ref<T>(&self) -> Option<&T>
+  where
+    T: AnyError + Sized,
+  {
+    if Any::type_id(&**self) == TypeId::of::<T>() {
+      let target = self as *const Self as *const &T;
+      let target = unsafe { &(*target as &T) };
+      Some(target)
+    } else {
+      None
+    }
+  }
+}
+
 impl DowncastErrorRef for &dyn AnyError {
   fn downcast_ref<T>(&self) -> Option<&T>
   where