util reexports less std

ethkey/src/secret.rs

@@ -17,6 +17,7 @@
 use std::fmt;
 use std::ops::Deref;
 use std::str::FromStr;
+use rustc_hex::ToHex;
 use secp256k1::key;
 use bigint::hash::H256;
 use {Error, SECP256K1};
@@ -26,6 +27,12 @@ pub struct Secret {
 	inner: H256,
 }
 
+impl ToHex for Secret {
+	fn to_hex(&self) -> String {
+		self.inner.to_hex()
+	}
+}
+
 impl fmt::Debug for Secret {
 	fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
 		write!(fmt, "Secret: 0x{:x}{:x}..{:x}{:x}", self.inner[0], self.inner[1], self.inner[30], self.inner[31])