Extract DescriptorExtendedPublicKey type

Author: Scott Robinson

src/descriptor/key.rs

@@ -18,13 +18,15 @@ use crate::prelude::*;
 use crate::serde::{Deserialize, Deserializer, Serialize, Serializer};
 use crate::{hash256, MiniscriptKey, ToPublicKey};
 
+type DescriptorExtendedPublicKey = DescriptorXKey<bip32::ExtendedPubKey>;
+
 /// The descriptor pubkey, either a single pubkey or an xpub.
 #[derive(Debug, Eq, PartialEq, Clone, Ord, PartialOrd, Hash)]
 pub enum DescriptorPublicKey {
     /// Single public key.
     Single(SinglePub),
     /// Extended public key (xpub).
-    XPub(DescriptorXKey<bip32::ExtendedPubKey>),
+    XPub(DescriptorExtendedPublicKey),
     /// Multiple extended public keys.
     MultiXPub(DescriptorMultiXKey<bip32::ExtendedPubKey>),
 }
@@ -221,7 +223,7 @@ impl DescriptorXKey<bip32::ExtendedPrivKey> {
     fn to_public<C: Signing>(
         &self,
         secp: &Secp256k1<C>,
-    ) -> Result<DescriptorXKey<bip32::ExtendedPubKey>, DescriptorKeyParseError> {
+    ) -> Result<DescriptorExtendedPublicKey, DescriptorKeyParseError> {
         let unhardened = self
             .derivation_path
             .into_iter()