Derive Hash for enums

Audit the whole crate and for any enum that can derive `Hash`. Exclude
error enums.

Derive `Hash` on any non-error enums that can.

src/descriptor/key.rs

@@ -22,7 +22,7 @@ pub enum DescriptorPublicKey {
 }
 
 /// The descriptor secret key, either a single private key or an xprv.
-#[derive(Debug)]
+#[derive(Debug, Hash)]
 pub enum DescriptorSecretKey {
     /// Single private key.
     Single(SinglePriv),

src/expression.rs

@@ -37,6 +37,7 @@ pub trait FromTree: Sized {
     fn from_tree(top: &Tree) -> Result<Self, Error>;
 }
 
+#[derive(Hash)]
 enum Found {
     Nothing,
     LBracket(usize), // Either a left ( or {

src/interpreter/mod.rs

@@ -59,7 +59,7 @@ pub struct Interpreter<'txin> {
 // Ecdsa and Schnorr signatures
 
 /// A type for representing signatures supported as of bitcoin core 22.0
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum KeySigPair {
     /// A Full public key and corresponding Ecdsa signature
     Ecdsa(bitcoin::PublicKey, bitcoin::EcdsaSig),
@@ -451,7 +451,7 @@ impl<'txin> Interpreter<'txin> {
 }
 
 /// Type of HashLock used for SatisfiedConstraint structure
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
 pub enum HashLockType {
     ///SHA 256 hashlock
     Sha256(sha256::Hash),
@@ -466,7 +466,7 @@ pub enum HashLockType {
 /// A satisfied Miniscript condition (Signature, Hashlock, Timelock)
 /// 'intp represents the lifetime of descriptor and `stack represents
 /// the lifetime of witness
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
 pub enum SatisfiedConstraint {
     ///Public key and corresponding signature
     PublicKey {

src/miniscript/decode.rs

@@ -95,7 +95,7 @@ mod private {
     impl Sealed for super::bitcoin::secp256k1::XOnlyPublicKey {}
 }
 
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, Hash)]
 enum NonTerm {
     Expression,
     WExpression,

src/miniscript/lex.rs

@@ -24,7 +24,7 @@ use std::fmt;
 use super::Error;
 
 /// Atom of a tokenized version of a script
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 #[allow(missing_docs)]
 pub enum Token<'s> {
     BoolAnd,