1 files changed, 33 insertions, 0 deletions
diff --git a/third_party/rust/thiserror/src/aserror.rs b/third_party/rust/thiserror/src/aserror.rs
new file mode 100644
index 0000000000..82902967cd
--- /dev/null
+++ b/third_party/rust/thiserror/src/aserror.rs
@@ -0,0 +1,33 @@
+use std::error::Error;
+
+pub trait AsDynError {
+    fn as_dyn_error(&self) -> &(dyn Error + 'static);
+}
+
+impl<T: Error + 'static> AsDynError for T {
+    #[inline]
+    fn as_dyn_error(&self) -> &(dyn Error + 'static) {
+        self
+    }
+}
+
+impl AsDynError for dyn Error + 'static {
+    #[inline]
+    fn as_dyn_error(&self) -> &(dyn Error + 'static) {
+        self
+    }
+}
+
+impl AsDynError for dyn Error + Send + 'static {
+    #[inline]
+    fn as_dyn_error(&self) -> &(dyn Error + 'static) {
+        self
+    }
+}
+
+impl AsDynError for dyn Error + Send + Sync + 'static {
+    #[inline]
+    fn as_dyn_error(&self) -> &(dyn Error + 'static) {
+        self
+    }
+}