Bump MSRV to 1.56

src/wallet/export.rs

@@ -101,7 +101,7 @@ impl FromStr for FullyNodedExport {
 }
 
 fn remove_checksum(s: String) -> String {
-    s.splitn(2, '#').next().map(String::from).unwrap()
+    s.split_once('#').map(|(a, _)| String::from(a)).unwrap()
 }
 
 impl FullyNodedExport {

src/wallet/mod.rs

@@ -1603,9 +1603,9 @@ where
     pub fn descriptor_checksum(&self, keychain: KeychainKind) -> String {
         self.get_descriptor_for_keychain(keychain)
             .to_string()
-            .splitn(2, '#')
-            .next()
+            .split_once('#')
             .unwrap()
+            .0
             .to_string()
     }
 }

src/wallet/signer.rs

@@ -479,6 +479,7 @@ pub struct SignOptions {
     pub allow_all_sighashes: bool,
 }
 
+#[allow(clippy::derivable_impls)]
 impl Default for SignOptions {
     fn default() -> Self {
         SignOptions {