Update to use edition 2018

Add `edition = "2018"` to the minifest file. In order to get the
codebase to build cleanly do:

- Remove usage of `use Hash as HashTrait`, instead use
  `impl crate::Hash for Hash` and `use Hash as _`.
- Same for HashEngine (remove EngineTrait).
- Add `crate::` to import statements and group same level (only did this
  for crate imports, the rest can wait for rustfmt :)
- Make test imports uniform, elect to _not_ use `super::*` because it
  seems cleaner, we are always importing the module we are testing and
  the same set of traits in each `test` module. Can change if requested.

Cargo.toml

@@ -9,6 +9,7 @@ repository = "https://github.com/rust-bitcoin/bitcoin_hashes/"
 documentation = "https://docs.rs/bitcoin_hashes/"
 keywords = [ "crypto", "bitcoin", "hash", "digest" ]
 readme = "README.md"
+edition = "2018"
 
 [lib]
 name = "bitcoin_hashes"

src/cmp.rs

@@ -83,10 +83,8 @@ fn eq_test() {
 mod benches {
     use test::Bencher;
 
-    use sha256;
-    use sha512;
-    use Hash;
-    use cmp::fixed_time_eq;
+    use crate::{Hash, sha256, sha512};
+    use crate::cmp::fixed_time_eq;
 
     #[bench]
     fn bench_32b_constant_time_cmp_ne(bh: &mut Bencher) {

src/hash160.rs

@@ -21,10 +21,7 @@
 
 use core::str;
 
-use sha256;
-use ripemd160;
-use Hash as HashTrait;
-use Error;
+use crate::{Error, hex, ripemd160, sha256};
 
 /// Output of the Bitcoin HASH160 hash function
 #[derive(Copy, Clone, PartialEq, Eq, Default, PartialOrd, Ord, Hash)]
@@ -35,8 +32,6 @@ pub struct Hash(
     [u8; 20]
 );
 
-
-
 hex_fmt_impl!(Debug, Hash);
 hex_fmt_impl!(Display, Hash);
 hex_fmt_impl!(LowerHex, Hash);
@@ -45,13 +40,13 @@ serde_impl!(Hash, 20);
 borrow_slice_impl!(Hash);
 
 impl str::FromStr for Hash {
-    type Err = ::hex::Error;
+    type Err = hex::Error;
     fn from_str(s: &str) -> Result<Self, Self::Err> {
-        ::hex::FromHex::from_hex(s)
+        hex::FromHex::from_hex(s)
     }
 }
 
-impl HashTrait for Hash {
+impl crate::Hash for Hash {
     type Engine = sha256::HashEngine;
     type Inner = [u8; 20];
 
@@ -95,10 +90,8 @@ impl HashTrait for Hash {
 
 #[cfg(test)]
 mod tests {
-    use hash160;
-    use hex::{FromHex, ToHex};
-    use Hash;
-    use HashEngine;
+    use crate::{Hash, HashEngine, hash160};
+    use crate::hex::{FromHex, ToHex};
 
     #[derive(Clone)]
     struct Test {
@@ -173,9 +166,7 @@ mod tests {
 mod benches {
     use test::Bencher;
 
-    use hash160;
-    use Hash;
-    use HashEngine;
+    use crate::{Hash, HashEngine, hash160};
 
     #[bench]
     pub fn hash160_10(bh: & mut Bencher) {

src/hex.rs

@@ -16,17 +16,17 @@
 //!
 
 #[cfg(any(feature = "std", feature = "alloc"))]
-use alloc::{string::String, vec::Vec};
+use crate::alloc::{string::String, vec::Vec};
 #[cfg(feature = "alloc")]
-use alloc::format;
+use crate::alloc::format;
 
 #[cfg(feature = "std")]
 use std::io;
 #[cfg(all(not(feature = "std"), feature = "core2"))]
 use core2::io;
 
 use core::{fmt, str};
-use Hash;
+use crate::Hash;
 
 /// Hex decoding error
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]

src/hmac.rs

@@ -23,18 +23,16 @@ use core::{borrow, fmt, ops, str};
 #[cfg(feature="serde")]
 use serde::{Serialize, Serializer, Deserialize, Deserializer};
 
-use HashEngine as EngineTrait;
-use Hash as HashTrait;
-use Error;
+use crate::{Error, Hash, HashEngine};
 
 /// A hash computed from a RFC 2104 HMAC. Parameterized by the underlying hash function.
 #[derive(Copy, Clone, PartialEq, Eq, Default, PartialOrd, Ord, Hash)]
 #[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 #[cfg_attr(feature = "schemars", schemars(transparent))]
 #[repr(transparent)]
-pub struct Hmac<T: HashTrait>(T);
+pub struct Hmac<T: Hash>(T);
 
-impl<T: HashTrait + str::FromStr> str::FromStr for Hmac<T> {
+impl<T: Hash + str::FromStr> str::FromStr for Hmac<T> {
     type Err = <T as str::FromStr>::Err;
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         Ok(Hmac(str::FromStr::from_str(s)?))
@@ -43,27 +41,27 @@ impl<T: HashTrait + str::FromStr> str::FromStr for Hmac<T> {
 
 /// Pair of underlying hash midstates which represent the current state
 /// of an `HmacEngine`
-pub struct HmacMidState<T: HashTrait> {
+pub struct HmacMidState<T: Hash> {
     /// Midstate of the inner hash engine
-    pub inner: <T::Engine as EngineTrait>::MidState,
+    pub inner: <T::Engine as HashEngine>::MidState,
     /// Midstate of the outer hash engine
-    pub outer: <T::Engine as EngineTrait>::MidState,
+    pub outer: <T::Engine as HashEngine>::MidState,
 }
 
 /// Pair of underyling hash engines, used for the inner and outer hash of HMAC
 #[derive(Clone)]
-pub struct HmacEngine<T: HashTrait> {
+pub struct HmacEngine<T: Hash> {
     iengine: T::Engine,
     oengine: T::Engine,
 }
 
-impl<T: HashTrait> Default for HmacEngine<T> {
+impl<T: Hash> Default for HmacEngine<T> {
     fn default() -> Self {
         HmacEngine::new(&[])
     }
 }
 
-impl<T: HashTrait> HmacEngine<T> {
+impl<T: Hash> HmacEngine<T> {
     /// Construct a new keyed HMAC with the given key. We only support underlying hashes
     /// whose block sizes are ≤ 128 bytes; larger hashes will result in panics.
     pub fn new(key: &[u8]) -> HmacEngine<T> {
@@ -72,12 +70,12 @@ impl<T: HashTrait> HmacEngine<T> {
         let mut ipad = [0x36u8; 128];
         let mut opad = [0x5cu8; 128];
         let mut ret = HmacEngine {
-            iengine: <T as HashTrait>::engine(),
-            oengine: <T as HashTrait>::engine(),
+            iengine: <T as Hash>::engine(),
+            oengine: <T as Hash>::engine(),
         };
 
         if key.len() > T::Engine::BLOCK_SIZE {
-            let hash = <T as HashTrait>::hash(key);
+            let hash = <T as Hash>::hash(key);
             for (b_i, b_h) in ipad.iter_mut().zip(&hash[..]) {
                 *b_i ^= *b_h;
             }
@@ -93,8 +91,8 @@ impl<T: HashTrait> HmacEngine<T> {
             }
         };
 
-        EngineTrait::input(&mut ret.iengine, &ipad[..T::Engine::BLOCK_SIZE]);
-        EngineTrait::input(&mut ret.oengine, &opad[..T::Engine::BLOCK_SIZE]);
+        HashEngine::input(&mut ret.iengine, &ipad[..T::Engine::BLOCK_SIZE]);
+        HashEngine::input(&mut ret.oengine, &opad[..T::Engine::BLOCK_SIZE]);
         ret
     }
 
@@ -108,7 +106,7 @@ impl<T: HashTrait> HmacEngine<T> {
     }
 }
 
-impl<T: HashTrait> EngineTrait for HmacEngine<T> {
+impl<T: Hash> HashEngine for HmacEngine<T> {
     type MidState = HmacMidState<T>;
 
     fn midstate(&self) -> Self::MidState {
@@ -129,66 +127,66 @@ impl<T: HashTrait> EngineTrait for HmacEngine<T> {
     }
 }
 
-impl<T: HashTrait> fmt::Debug for Hmac<T> {
+impl<T: Hash> fmt::Debug for Hmac<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         fmt::Debug::fmt(&self.0, f)
     }
 }
 
-impl<T: HashTrait> fmt::Display for Hmac<T> {
+impl<T: Hash> fmt::Display for Hmac<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         fmt::Display::fmt(&self.0, f)
     }
 }
 
-impl<T: HashTrait> fmt::LowerHex for Hmac<T> {
+impl<T: Hash> fmt::LowerHex for Hmac<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         fmt::LowerHex::fmt(&self.0, f)
     }
 }
 
-impl<T: HashTrait> ops::Index<usize> for Hmac<T> {
+impl<T: Hash> ops::Index<usize> for Hmac<T> {
     type Output = u8;
     fn index(&self, index: usize) -> &u8 {
         &self.0[index]
     }
 }
 
-impl<T: HashTrait> ops::Index<ops::Range<usize>> for Hmac<T> {
+impl<T: Hash> ops::Index<ops::Range<usize>> for Hmac<T> {
     type Output = [u8];
     fn index(&self, index: ops::Range<usize>) -> &[u8] {
         &self.0[index]
     }
 }
 
-impl<T: HashTrait> ops::Index<ops::RangeFrom<usize>> for Hmac<T> {
+impl<T: Hash> ops::Index<ops::RangeFrom<usize>> for Hmac<T> {
     type Output = [u8];
     fn index(&self, index: ops::RangeFrom<usize>) -> &[u8] {
         &self.0[index]
     }
 }
 
-impl<T: HashTrait> ops::Index<ops::RangeTo<usize>> for Hmac<T> {
+impl<T: Hash> ops::Index<ops::RangeTo<usize>> for Hmac<T> {
     type Output = [u8];
     fn index(&self, index: ops::RangeTo<usize>) -> &[u8] {
         &self.0[index]
     }
 }
 
-impl<T: HashTrait> ops::Index<ops::RangeFull> for Hmac<T> {
+impl<T: Hash> ops::Index<ops::RangeFull> for Hmac<T> {
     type Output = [u8];
     fn index(&self, index: ops::RangeFull) -> &[u8] {
         &self.0[index]
     }
 }
 
-impl<T: HashTrait> borrow::Borrow<[u8]> for Hmac<T> {
+impl<T: Hash> borrow::Borrow<[u8]> for Hmac<T> {
     fn borrow(&self) -> &[u8] {
         &self[..]
     }
 }
 
-impl<T: HashTrait> HashTrait for Hmac<T> {
+impl<T: Hash> Hash for Hmac<T> {
     type Engine = HmacEngine<T>;
     type Inner = T::Inner;
 
@@ -219,14 +217,14 @@ impl<T: HashTrait> HashTrait for Hmac<T> {
 }
 
 #[cfg(feature="serde")]
-impl<T: HashTrait + Serialize> Serialize for Hmac<T> {
+impl<T: Hash + Serialize> Serialize for Hmac<T> {
     fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
         Serialize::serialize(&self.0, s)
     }
 }
 
 #[cfg(feature="serde")]
-impl<'de, T: HashTrait + Deserialize<'de>> Deserialize<'de> for Hmac<T> {
+impl<'de, T: Hash + Deserialize<'de>> Deserialize<'de> for Hmac<T> {
     fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Hmac<T>, D::Error> {
         let inner = Deserialize::deserialize(d)?;
         Ok(Hmac(inner))
@@ -235,9 +233,8 @@ impl<'de, T: HashTrait + Deserialize<'de>> Deserialize<'de> for Hmac<T> {
 
 #[cfg(test)]
 mod tests {
-    use sha256;
-    #[cfg(feature="serde")] use sha512;
-    use {Hash, HashEngine, Hmac, HmacEngine};
+    use crate::{Hash, HashEngine, Hmac, HmacEngine, sha256};
+    #[cfg(feature="serde")] use crate::sha512;
 
     #[derive(Clone)]
     struct Test {
@@ -393,8 +390,7 @@ mod tests {
 mod benches {
     use test::Bencher;
 
-    use sha256;
-    use {Hmac, Hash, HashEngine};
+    use crate::{Hmac, Hash, HashEngine, sha256};
 
     #[bench]
     pub fn hmac_sha256_10(bh: & mut Bencher) {

src/impls.rs

@@ -22,9 +22,7 @@ use std::{error, io};
 #[cfg(not(feature = "std"))]
 use core2::{error, io};
 
-use {hex, sha1, sha256, sha512, ripemd160, siphash24, hmac};
-use HashEngine;
-use Error;
+use crate::{Error, HashEngine, hex, sha1, sha256, sha512, ripemd160, siphash24, hmac};
 
 impl error::Error for Error {
     #[cfg(feature = "std")]
@@ -85,7 +83,7 @@ impl io::Write for siphash24::HashEngine {
     }
 }
 
-impl<T: ::Hash> io::Write for hmac::HmacEngine<T> {
+impl<T: crate::Hash> io::Write for hmac::HmacEngine<T> {
     fn flush(&mut self) -> io::Result<()> { Ok(()) }
 
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
@@ -98,8 +96,7 @@ impl<T: ::Hash> io::Write for hmac::HmacEngine<T> {
 mod tests {
     use super::io::Write;
 
-    use {sha1, sha256, sha256d, sha512, ripemd160, hash160, siphash24, hmac};
-    use Hash;
+    use crate::{Hash, sha1, sha256, sha256d, sha512, ripemd160, hash160, siphash24, hmac};
 
     macro_rules! write_test {
         ($mod:ident, $exp_empty:expr, $exp_256:expr, $exp_64k:expr,) => {

src/lib.rs

@@ -150,17 +150,18 @@ pub trait Hash: Copy + Clone + PartialEq + Eq + Default + PartialOrd + Ord +
 
 #[cfg(test)]
 mod tests {
-    use Hash;
-    hash_newtype!(TestNewtype, ::sha256d::Hash, 32, doc="A test newtype");
-    hash_newtype!(TestNewtype2, ::sha256d::Hash, 32, doc="A test newtype");
+    use crate::{Hash, sha256d};
+
+    hash_newtype!(TestNewtype, sha256d::Hash, 32, doc="A test newtype");
+    hash_newtype!(TestNewtype2, sha256d::Hash, 32, doc="A test newtype");
 
     #[test]
     fn convert_newtypes() {
         let h1 = TestNewtype::hash(&[]);
         let h2: TestNewtype2 = h1.as_hash().into();
         assert_eq!(&h1[..], &h2[..]);
 
-        let h = ::sha256d::Hash::hash(&[]);
+        let h = sha256d::Hash::hash(&[]);
         let h2: TestNewtype = h.to_string().parse().unwrap();
         assert_eq!(h2.as_hash(), h);
     }