derive Debug for various structs

sapling-crypto/src/jubjub/edwards.rs

@@ -25,6 +25,7 @@ use std::io::{
 //
 // See "Twisted Edwards Curves Revisited"
 //     Huseyin Hisil, Kenneth Koon-Ho Wong, Gary Carter, and Ed Dawson
+#[derive(Debug)]
 pub struct Point<E: JubjubEngine, Subgroup> {
     x: E::Fr,
     y: E::Fr,

sapling-crypto/src/jubjub/mod.rs

@@ -43,6 +43,7 @@ pub mod fs;
 pub mod tests;
 
 /// Point of unknown order.
+#[derive(Debug)]
 pub enum Unknown { }
 
 /// Point of prime order.