Merge pull request #120 from ngrok/josh/common-error-pointers

ngrok: add Error impls for common pointer types

ngrok/src/internals/proto.rs

@@ -9,6 +9,7 @@ use std::{
     },
     str::FromStr,
     string::FromUtf8Error,
+    sync::Arc,
 };
 
 use muxado::typed::StreamType;
@@ -54,6 +55,42 @@ pub trait Error: error::Error {
     }
 }
 
+impl<E> Error for Box<E>
+where
+    E: Error,
+{
+    fn error_code(&self) -> Option<&str> {
+        <E as Error>::error_code(self)
+    }
+    fn msg(&self) -> String {
+        <E as Error>::msg(self)
+    }
+}
+
+impl<E> Error for Arc<E>
+where
+    E: Error,
+{
+    fn error_code(&self) -> Option<&str> {
+        <E as Error>::error_code(self)
+    }
+    fn msg(&self) -> String {
+        <E as Error>::msg(self)
+    }
+}
+
+impl<'a, E> Error for &'a E
+where
+    E: Error,
+{
+    fn error_code(&self) -> Option<&str> {
+        <E as Error>::error_code(self)
+    }
+    fn msg(&self) -> String {
+        <E as Error>::msg(self)
+    }
+}
+
 #[derive(Serialize, Deserialize, Debug, Clone, Default)]
 pub struct ErrResp {
     pub msg: String,