Shield hash_newtypes from rustfmt

In preparation for running the formatter on root level modules and a
submodule that holds all the macro calls in `hash_types` so we can
configure rustfmt to skip formatting them.

src/hash_types.rs

@@ -20,8 +20,6 @@
 //! hash).
 //!
 
-use crate::hashes::{Hash, sha256, sha256d, hash160, hash_newtype};
-
 macro_rules! impl_hashencode {
     ($hashtype:ident) => {
         impl $crate::consensus::Encodable for $hashtype {
@@ -39,40 +37,47 @@ macro_rules! impl_hashencode {
     }
 }
 
-hash_newtype!(
-    Txid, sha256d::Hash, 32, doc="A bitcoin transaction hash/transaction ID.
+// newtypes module is solely here so we can rustfmt::skip.
+pub use newtypes::*;
+
+#[rustfmt::skip]
+mod newtypes {
+    use crate::hashes::{Hash, sha256, sha256d, hash160, hash_newtype};
+
+    hash_newtype!(
+        Txid, sha256d::Hash, 32, doc="A bitcoin transaction hash/transaction ID.
 
 For compatibility with the existing Bitcoin infrastructure and historical
 and current versions of the Bitcoin Core software itself, this and
 other [`sha256d::Hash`] types, are serialized in reverse
 byte order when converted to a hex string via [`std::fmt::Display`] trait operations.
 See [`hashes::Hash::DISPLAY_BACKWARD`] for more details.
 ");
-hash_newtype!(Wtxid, sha256d::Hash, 32, doc="A bitcoin witness transaction ID.");
-hash_newtype!(BlockHash, sha256d::Hash, 32, doc="A bitcoin block hash.");
-hash_newtype!(Sighash, sha256d::Hash, 32, doc="Hash of the transaction according to the signature algorithm");
+    hash_newtype!(Wtxid, sha256d::Hash, 32, doc="A bitcoin witness transaction ID.");
+    hash_newtype!(BlockHash, sha256d::Hash, 32, doc="A bitcoin block hash.");
+    hash_newtype!(Sighash, sha256d::Hash, 32, doc="Hash of the transaction according to the signature algorithm");
 
-hash_newtype!(PubkeyHash, hash160::Hash, 20, doc="A hash of a public key.");
-hash_newtype!(ScriptHash, hash160::Hash, 20, doc="A hash of Bitcoin Script bytecode.");
-hash_newtype!(WPubkeyHash, hash160::Hash, 20, doc="SegWit version of a public key hash.");
-hash_newtype!(WScriptHash, sha256::Hash, 32, doc="SegWit version of a Bitcoin Script bytecode hash.");
+    hash_newtype!(PubkeyHash, hash160::Hash, 20, doc="A hash of a public key.");
+    hash_newtype!(ScriptHash, hash160::Hash, 20, doc="A hash of Bitcoin Script bytecode.");
+    hash_newtype!(WPubkeyHash, hash160::Hash, 20, doc="SegWit version of a public key hash.");
+    hash_newtype!(WScriptHash, sha256::Hash, 32, doc="SegWit version of a Bitcoin Script bytecode hash.");
 
-hash_newtype!(TxMerkleNode, sha256d::Hash, 32, doc="A hash of the Merkle tree branch or root for transactions");
-hash_newtype!(WitnessMerkleNode, sha256d::Hash, 32, doc="A hash corresponding to the Merkle tree root for witness data");
-hash_newtype!(WitnessCommitment, sha256d::Hash, 32, doc="A hash corresponding to the witness structure commitment in the coinbase transaction");
-hash_newtype!(XpubIdentifier, hash160::Hash, 20, doc="XpubIdentifier as defined in BIP-32.");
+    hash_newtype!(TxMerkleNode, sha256d::Hash, 32, doc="A hash of the Merkle tree branch or root for transactions");
+    hash_newtype!(WitnessMerkleNode, sha256d::Hash, 32, doc="A hash corresponding to the Merkle tree root for witness data");
+    hash_newtype!(WitnessCommitment, sha256d::Hash, 32, doc="A hash corresponding to the witness structure commitment in the coinbase transaction");
+    hash_newtype!(XpubIdentifier, hash160::Hash, 20, doc="XpubIdentifier as defined in BIP-32.");
 
-hash_newtype!(FilterHash, sha256d::Hash, 32, doc="Filter hash, as defined in BIP-157");
-hash_newtype!(FilterHeader, sha256d::Hash, 32, doc="Filter header, as defined in BIP-157");
+    hash_newtype!(FilterHash, sha256d::Hash, 32, doc="Filter hash, as defined in BIP-157");
+    hash_newtype!(FilterHeader, sha256d::Hash, 32, doc="Filter header, as defined in BIP-157");
 
+    impl_hashencode!(Txid);
+    impl_hashencode!(Wtxid);
+    impl_hashencode!(BlockHash);
+    impl_hashencode!(Sighash);
 
-impl_hashencode!(Txid);
-impl_hashencode!(Wtxid);
-impl_hashencode!(BlockHash);
-impl_hashencode!(Sighash);
+    impl_hashencode!(TxMerkleNode);
+    impl_hashencode!(WitnessMerkleNode);
 
-impl_hashencode!(TxMerkleNode);
-impl_hashencode!(WitnessMerkleNode);
-
-impl_hashencode!(FilterHash);
-impl_hashencode!(FilterHeader);
+    impl_hashencode!(FilterHash);
+    impl_hashencode!(FilterHeader);
+}