Refer to Script{Buf} as Self where relevant

Using `Self` instead of specific type name can make some refactorings
easier.

primitives/src/script/borrowed.rs

@@ -74,28 +74,28 @@ impl ToOwned for Script {
 impl Script {
     /// Constructs a new empty script.
     #[inline]
-    pub const fn new() -> &'static Script { Script::from_bytes(&[]) }
+    pub const fn new() -> &'static Self { Self::from_bytes(&[]) }
 
     /// Treat byte slice as `Script`
     #[inline]
-    pub const fn from_bytes(bytes: &[u8]) -> &Script {
+    pub const fn from_bytes(bytes: &[u8]) -> &Self {
         // SAFETY: copied from `std`
         // The pointer was just created from a reference which is still alive.
         // Casting slice pointer to a transparent struct wrapping that slice is sound (same
         // layout).
-        unsafe { &*(bytes as *const [u8] as *const Script) }
+        unsafe { &*(bytes as *const [u8] as *const Self) }
     }
 
     /// Treat mutable byte slice as `Script`
     #[inline]
-    pub fn from_bytes_mut(bytes: &mut [u8]) -> &mut Script {
+    pub fn from_bytes_mut(bytes: &mut [u8]) -> &mut Self {
         // SAFETY: copied from `std`
         // The pointer was just created from a reference which is still alive.
         // Casting slice pointer to a transparent struct wrapping that slice is sound (same
         // layout).
         // Function signature prevents callers from accessing `bytes` while the returned reference
         // is alive.
-        unsafe { &mut *(bytes as *mut [u8] as *mut Script) }
+        unsafe { &mut *(bytes as *mut [u8] as *mut Self) }
     }
 
     /// Returns the script data as a byte slice.

primitives/src/script/mod.rs

@@ -299,7 +299,7 @@ impl From<ScriptBuf> for Vec<u8> {
 
 impl AsRef<Script> for Script {
     #[inline]
-    fn as_ref(&self) -> &Script { self }
+    fn as_ref(&self) -> &Self { self }
 }
 
 impl AsRef<Script> for ScriptBuf {
@@ -319,7 +319,7 @@ impl AsRef<[u8]> for ScriptBuf {
 
 impl AsMut<Script> for Script {
     #[inline]
-    fn as_mut(&mut self) -> &mut Script { self }
+    fn as_mut(&mut self) -> &mut Self { self }
 }
 
 impl AsMut<Script> for ScriptBuf {
@@ -435,14 +435,14 @@ impl fmt::LowerHex for Script {
     }
 }
 #[cfg(feature = "alloc")]
-internals::impl_to_hex_from_lower_hex!(Script, |script: &Script| script.len() * 2);
+internals::impl_to_hex_from_lower_hex!(Script, |script: &Self| script.len() * 2);
 
 impl fmt::LowerHex for ScriptBuf {
     #[inline]
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fmt::LowerHex::fmt(self.as_script(), f) }
 }
 #[cfg(feature = "alloc")]
-internals::impl_to_hex_from_lower_hex!(ScriptBuf, |script_buf: &ScriptBuf| script_buf.len() * 2);
+internals::impl_to_hex_from_lower_hex!(ScriptBuf, |script_buf: &Self| script_buf.len() * 2);
 
 impl fmt::UpperHex for Script {
     #[inline]

primitives/src/script/owned.rs

@@ -23,13 +23,13 @@ pub struct ScriptBuf(Vec<u8>);
 impl ScriptBuf {
     /// Constructs a new empty script.
     #[inline]
-    pub const fn new() -> Self { ScriptBuf::from_bytes(Vec::new()) }
+    pub const fn new() -> Self { Self::from_bytes(Vec::new()) }
 
     /// Converts byte vector into script.
     ///
     /// This method doesn't (re)allocate.
     #[inline]
-    pub const fn from_bytes(bytes: Vec<u8>) -> Self { ScriptBuf(bytes) }
+    pub const fn from_bytes(bytes: Vec<u8>) -> Self { Self(bytes) }
 
     /// Returns a reference to unsized script.
     #[inline]