From a708900a11f829ee0c4df8c9b4950e9cc8756f20 Mon Sep 17 00:00:00 2001
From: cheme <emericchevalier.pro@gmail.com>
Date: Tue, 28 Apr 2020 19:42:49 +0200
Subject: [PATCH] Revert "remove deprecated description for TrieError (#85)"

This reverts commit bc8a83f935ceed16232aa994bd9e156758289d1a.
---
 trie-db/src/lib.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/trie-db/src/lib.rs b/trie-db/src/lib.rs
index d9b31b66..05b52686 100644
--- a/trie-db/src/lib.rs
+++ b/trie-db/src/lib.rs
@@ -121,6 +121,19 @@ impl<T, E> fmt::Display for TrieError<T, E> where T: MaybeDebug, E: MaybeDebug {
 	}
 }
 
+#[cfg(feature = "std")]
+impl<T, E> Error for TrieError<T, E> where T: fmt::Debug, E: Error {
+	fn description(&self) -> &str {
+		match *self {
+			TrieError::InvalidStateRoot(_) => "Invalid state root",
+			TrieError::IncompleteDatabase(_) => "Incomplete database",
+			TrieError::ValueAtIncompleteKey(_, _) => "Value at incomplete key",
+			TrieError::DecoderError(_, ref err) => err.description(),
+			TrieError::InvalidHash(_, _) => "Encoded node contains invalid hash reference",
+		}
+	}
+}
+
 /// Trie result type.
 /// Boxed to avoid copying around extra space for the `Hasher`s `Out` on successful queries.
 pub type Result<T, H, E> = crate::rstd::result::Result<T, Box<TrieError<H, E>>>;