Fix in preparation for next edition

Use cargo to upgrade from edition 2015 to edition 2018.

 cargo fix --edition

No manual changes made. The result of the command above is just to fix
all the use statements (add `crate::`) and fix the fully qualified path
formats i.e., `::Foo` -> `crate::Foo`.

src/blockdata/block.rs

@@ -20,22 +20,22 @@
 //! these blocks and the blockchain.
 //!
 
-use prelude::*;
+use crate::prelude::*;
 
 use core::fmt;
 
-use util;
-use util::Error::{BlockBadTarget, BlockBadProofOfWork};
-use util::hash::bitcoin_merkle_root;
-use hashes::{Hash, HashEngine};
-use hash_types::{Wtxid, BlockHash, TxMerkleNode, WitnessMerkleNode, WitnessCommitment};
-use util::uint::Uint256;
-use consensus::encode::Encodable;
-use network::constants::Network;
-use blockdata::transaction::Transaction;
-use blockdata::constants::{max_target, WITNESS_SCALE_FACTOR};
-use blockdata::script;
-use VarInt;
+use crate::util;
+use crate::util::Error::{BlockBadTarget, BlockBadProofOfWork};
+use crate::util::hash::bitcoin_merkle_root;
+use crate::hashes::{Hash, HashEngine};
+use crate::hash_types::{Wtxid, BlockHash, TxMerkleNode, WitnessMerkleNode, WitnessCommitment};
+use crate::util::uint::Uint256;
+use crate::consensus::encode::Encodable;
+use crate::network::constants::Network;
+use crate::blockdata::transaction::Transaction;
+use crate::blockdata::constants::{max_target, WITNESS_SCALE_FACTOR};
+use crate::blockdata::script;
+use crate::VarInt;
 
 /// A block header, which contains all the block's information except
 /// the actual transactions
@@ -359,13 +359,13 @@ impl ::std::error::Error for Bip34Error {}
 
 #[cfg(test)]
 mod tests {
-    use hashes::hex::FromHex;
+    use crate::hashes::hex::FromHex;
 
-    use blockdata::block::{Block, BlockHeader};
-    use consensus::encode::{deserialize, serialize};
-    use util::uint::Uint256;
-    use util::Error::{BlockBadTarget, BlockBadProofOfWork};
-    use network::constants::Network;
+    use crate::blockdata::block::{Block, BlockHeader};
+    use crate::consensus::encode::{deserialize, serialize};
+    use crate::util::uint::Uint256;
+    use crate::util::Error::{BlockBadTarget, BlockBadProofOfWork};
+    use crate::network::constants::Network;
 
     #[test]
     fn test_coinbase_and_bip34() {

src/blockdata/constants.rs

@@ -19,19 +19,19 @@
 //! single transaction.
 //!
 
-use prelude::*;
+use crate::prelude::*;
 
 use core::default::Default;
 
-use hashes::hex::{self, HexIterator};
-use hashes::sha256d;
-use blockdata::opcodes;
-use blockdata::script;
-use blockdata::transaction::{OutPoint, Transaction, TxOut, TxIn};
-use blockdata::block::{Block, BlockHeader};
-use blockdata::witness::Witness;
-use network::constants::Network;
-use util::uint::Uint256;
+use crate::hashes::hex::{self, HexIterator};
+use crate::hashes::sha256d;
+use crate::blockdata::opcodes;
+use crate::blockdata::script;
+use crate::blockdata::transaction::{OutPoint, Transaction, TxOut, TxIn};
+use crate::blockdata::block::{Block, BlockHeader};
+use crate::blockdata::witness::Witness;
+use crate::network::constants::Network;
+use crate::util::uint::Uint256;
 
 /// The maximum allowable sequence number
 pub const MAX_SEQUENCE: u32 = 0xFFFFFFFF;
@@ -179,12 +179,12 @@ pub fn genesis_block(network: Network) -> Block {
 #[cfg(test)]
 mod test {
     use core::default::Default;
-    use hashes::hex::FromHex;
+    use crate::hashes::hex::FromHex;
 
-    use network::constants::Network;
-    use consensus::encode::serialize;
-    use blockdata::constants::{genesis_block, bitcoin_genesis_tx};
-    use blockdata::constants::{MAX_SEQUENCE, COIN_VALUE};
+    use crate::network::constants::Network;
+    use crate::consensus::encode::serialize;
+    use crate::blockdata::constants::{genesis_block, bitcoin_genesis_tx};
+    use crate::blockdata::constants::{MAX_SEQUENCE, COIN_VALUE};
 
     #[test]
     fn bitcoin_genesis_first_transaction() {

src/blockdata/script.rs

@@ -23,28 +23,28 @@
 //! This module provides the structures and functions needed to support scripts.
 //!
 
-use prelude::*;
+use crate::prelude::*;
 
-use io;
+use crate::io;
 use core::{fmt, default::Default};
 use core::ops::Index;
 
 #[cfg(feature = "serde")] use serde;
 
-use hash_types::{PubkeyHash, WPubkeyHash, ScriptHash, WScriptHash};
-use blockdata::opcodes;
-use consensus::{encode, Decodable, Encodable};
-use hashes::{Hash, hex};
-use policy::DUST_RELAY_TX_FEE;
+use crate::hash_types::{PubkeyHash, WPubkeyHash, ScriptHash, WScriptHash};
+use crate::blockdata::opcodes;
+use crate::consensus::{encode, Decodable, Encodable};
+use crate::hashes::{Hash, hex};
+use crate::policy::DUST_RELAY_TX_FEE;
 #[cfg(feature="bitcoinconsensus")] use bitcoinconsensus;
 #[cfg(feature="bitcoinconsensus")] use core::convert::From;
-use OutPoint;
+use crate::OutPoint;
 
-use util::key::PublicKey;
-use util::address::WitnessVersion;
-use util::taproot::{LeafVersion, TapBranchHash, TapLeafHash};
+use crate::util::key::PublicKey;
+use crate::util::address::WitnessVersion;
+use crate::util::taproot::{LeafVersion, TapBranchHash, TapLeafHash};
 use secp256k1::{Secp256k1, Verification, XOnlyPublicKey};
-use schnorr::{TapTweak, TweakedPublicKey, UntweakedPublicKey};
+use crate::schnorr::{TapTweak, TweakedPublicKey, UntweakedPublicKey};
 
 /// A Bitcoin script.
 #[derive(Clone, Default, PartialOrd, Ord, PartialEq, Eq, Hash)]
@@ -557,7 +557,7 @@ impl Script {
 
     /// Checks whether a script can be proven to have no satisfying input.
     pub fn is_provably_unspendable(&self) -> bool {
-        use blockdata::opcodes::Class::{ReturnOp, IllegalOp};
+        use crate::blockdata::opcodes::Class::{ReturnOp, IllegalOp};
 
         match self.0.first() {
             Some(b) => {
@@ -572,7 +572,7 @@ impl Script {
 
     /// Returns the minimum value an output with this script should have in order to be
     /// broadcastable on today's Bitcoin network.
-    pub fn dust_value(&self) -> ::Amount {
+    pub fn dust_value(&self) -> crate::Amount {
         // This must never be lower than Bitcoin Core's GetDustThreshold() (as of v0.21) as it may
         // otherwise allow users to create transactions which likely can never be broadcast/confirmed.
         let sats = DUST_RELAY_TX_FEE as u64 / 1000 * // The default dust relay fee is 3000 satoshi/kB (i.e. 3 sat/vByte)
@@ -588,7 +588,7 @@ impl Script {
             self.consensus_encode(&mut sink()).expect("sinks don't error") as u64 // The serialized size of this script_pubkey
         };
 
-        ::Amount::from_sat(sats)
+        crate::Amount::from_sat(sats)
     }
 
     /// Iterates over the script in the form of `Instruction`s, which are an enum covering opcodes,
@@ -1075,11 +1075,11 @@ mod test {
     use super::*;
     use super::build_scriptint;
 
-    use hashes::hex::{FromHex, ToHex};
-    use consensus::encode::{deserialize, serialize};
-    use blockdata::opcodes;
-    use util::key::PublicKey;
-    use util::psbt::serialize::Serialize;
+    use crate::hashes::hex::{FromHex, ToHex};
+    use crate::consensus::encode::{deserialize, serialize};
+    use crate::blockdata::opcodes;
+    use crate::util::key::PublicKey;
+    use crate::util::psbt::serialize::Serialize;
 
     #[test]
     fn script() {
@@ -1449,7 +1449,7 @@ mod test {
         // well-known scriptPubKey types.
         let script_p2wpkh = Builder::new().push_int(0).push_slice(&[42; 20]).into_script();
         assert!(script_p2wpkh.is_v0_p2wpkh());
-        assert_eq!(script_p2wpkh.dust_value(), ::Amount::from_sat(294));
+        assert_eq!(script_p2wpkh.dust_value(), crate::Amount::from_sat(294));
 
         let script_p2pkh = Builder::new()
             .push_opcode(opcodes::all::OP_DUP)
@@ -1459,7 +1459,7 @@ mod test {
             .push_opcode(opcodes::all::OP_CHECKSIG)
             .into_script();
         assert!(script_p2pkh.is_p2pkh());
-        assert_eq!(script_p2pkh.dust_value(), ::Amount::from_sat(546));
+        assert_eq!(script_p2pkh.dust_value(), crate::Amount::from_sat(546));
     }
 
     #[test]

src/blockdata/transaction.rs

@@ -23,24 +23,24 @@
 //! This module provides the structures and functions needed to support transactions.
 //!
 
-use prelude::*;
+use crate::prelude::*;
 
-use io;
+use crate::io;
 use core::{fmt, str, default::Default};
 #[cfg(feature = "std")] use std::error;
 
-use hashes::{self, Hash, sha256d};
-use hashes::hex::FromHex;
+use crate::hashes::{self, Hash, sha256d};
+use crate::hashes::hex::FromHex;
 
-use util::endian;
-use blockdata::constants::WITNESS_SCALE_FACTOR;
+use crate::util::endian;
+use crate::blockdata::constants::WITNESS_SCALE_FACTOR;
 #[cfg(feature="bitcoinconsensus")] use blockdata::script;
-use blockdata::script::Script;
-use blockdata::witness::Witness;
-use consensus::{encode, Decodable, Encodable};
-use consensus::encode::MAX_VEC_SIZE;
-use hash_types::{Sighash, Txid, Wtxid};
-use VarInt;
+use crate::blockdata::script::Script;
+use crate::blockdata::witness::Witness;
+use crate::consensus::{encode, Decodable, Encodable};
+use crate::consensus::encode::MAX_VEC_SIZE;
+use crate::hash_types::{Sighash, Txid, Wtxid};
+use crate::VarInt;
 
 #[cfg(doc)]
 use util::sighash::SchnorrSighashType;
@@ -895,17 +895,17 @@ mod tests {
     use super::*;
 
     use core::str::FromStr;
-    use blockdata::constants::WITNESS_SCALE_FACTOR;
-    use blockdata::script::Script;
-    use consensus::encode::serialize;
-    use consensus::encode::deserialize;
+    use crate::blockdata::constants::WITNESS_SCALE_FACTOR;
+    use crate::blockdata::script::Script;
+    use crate::consensus::encode::serialize;
+    use crate::consensus::encode::deserialize;
 
-    use hashes::Hash;
-    use hashes::hex::FromHex;
+    use crate::hashes::Hash;
+    use crate::hashes::hex::FromHex;
 
-    use hash_types::*;
+    use crate::hash_types::*;
     use super::EcdsaSighashType;
-    use util::sighash::SighashCache;
+    use crate::util::sighash::SighashCache;
 
     #[test]
     fn test_outpoint() {
@@ -958,8 +958,8 @@ mod tests {
 
     #[test]
     fn test_is_coinbase () {
-        use network::constants::Network;
-        use blockdata::constants;
+        use crate::network::constants::Network;
+        use crate::blockdata::constants;
 
         let genesis = constants::genesis_block(Network::Bitcoin);
         assert! (genesis.txdata[0].is_coin_base());

src/blockdata/witness.rs

@@ -3,13 +3,13 @@
 //! This module contains the [`Witness`] struct and related methods to operate on it
 //!
 
-use blockdata::transaction::EcdsaSighashType;
-use consensus::encode::{Error, MAX_VEC_SIZE};
-use consensus::{Decodable, Encodable, WriteExt};
-use io::{self, Read, Write};
-use prelude::*;
+use crate::blockdata::transaction::EcdsaSighashType;
+use crate::consensus::encode::{Error, MAX_VEC_SIZE};
+use crate::consensus::{Decodable, Encodable, WriteExt};
+use crate::io::{self, Read, Write};
+use crate::prelude::*;
 use secp256k1::ecdsa;
-use VarInt;
+use crate::VarInt;
 
 #[cfg(feature = "serde")]
 use serde;
@@ -302,12 +302,12 @@ impl<'de> serde::Deserialize<'de> for Witness {
 
 #[cfg(test)]
 mod test {
-    use blockdata::transaction::EcdsaSighashType;
-    use blockdata::witness::Witness;
-    use consensus::{deserialize, serialize};
-    use hashes::hex::{FromHex, ToHex};
-    use Transaction;
-    use secp256k1::ecdsa;
+    use super::*;
+
+    use crate::consensus::{deserialize, serialize};
+    use crate::hashes::hex::{FromHex, ToHex};
+    use crate::Transaction;
+    use crate::secp256k1::ecdsa;
 
     #[test]
     fn test_push() {

src/consensus/encode.rs

@@ -27,24 +27,24 @@
 //! typically big-endian decimals, etc.)
 //!
 
-use prelude::*;
+use crate::prelude::*;
 
 use core::{fmt, mem, u32, convert::From};
 #[cfg(feature = "std")] use std::error;
 
-use hashes::{sha256d, Hash, sha256};
-use hash_types::{BlockHash, FilterHash, TxMerkleNode, FilterHeader};
+use crate::hashes::{sha256d, Hash, sha256};
+use crate::hash_types::{BlockHash, FilterHash, TxMerkleNode, FilterHeader};
 
-use io::{self, Cursor, Read};
+use crate::io::{self, Cursor, Read};
 
-use util::endian;
-use util::psbt;
-use util::taproot::TapLeafHash;
-use hashes::hex::ToHex;
+use crate::util::endian;
+use crate::util::psbt;
+use crate::util::taproot::TapLeafHash;
+use crate::hashes::hex::ToHex;
 
-use blockdata::transaction::{TxOut, Transaction, TxIn};
+use crate::blockdata::transaction::{TxOut, Transaction, TxIn};
 #[cfg(feature = "std")]
-use network::{message_blockdata::Inventory, address::{Address, AddrV2Message}};
+use crate::network::{message_blockdata::Inventory, address::{Address, AddrV2Message}};
 
 /// Encoding error
 #[derive(Debug)]
@@ -776,11 +776,11 @@ mod tests {
     use core::{mem::{self, discriminant}, fmt};
     use super::{deserialize, serialize, Error, CheckedData, VarInt};
     use super::{Transaction, BlockHash, FilterHash, TxMerkleNode, TxOut, TxIn};
-    use consensus::{Encodable, deserialize_partial, Decodable};
-    use util::endian::{u64_to_array_le, u32_to_array_le, u16_to_array_le};
+    use crate::consensus::{Encodable, deserialize_partial, Decodable};
+    use crate::util::endian::{u64_to_array_le, u32_to_array_le, u16_to_array_le};
     use secp256k1::rand::{thread_rng, Rng};
     #[cfg(feature = "std")]
-    use network::{Address, message_blockdata::Inventory};
+    use crate::network::{Address, message_blockdata::Inventory};
 
     #[test]
     fn serialize_int_test() {

src/consensus/params.rs

@@ -18,8 +18,8 @@
 //! chains (such as mainnet, testnet).
 //!
 
-use network::constants::Network;
-use util::uint::Uint256;
+use crate::network::constants::Network;
+use crate::util::uint::Uint256;
 
 /// Lowest possible difficulty for Mainnet. See comment on Params::pow_limit for more info.
 const MAX_BITS_BITCOIN: Uint256 = Uint256([

src/hash_types.rs

@@ -20,7 +20,7 @@
 //! hash).
 //!
 
-use hashes::{Hash, sha256, sha256d, hash160};
+use crate::hashes::{Hash, sha256, sha256d, hash160};
 
 macro_rules! impl_hashencode {
     ($hashtype:ident) => {