Update to 2018 edition

.travis.yml

@@ -3,17 +3,14 @@ language: rust
 
 matrix:
   include:
-    - rust: 1.15.0
+    - rust: 1.31.0
     - rust: stable
     - rust: beta
     - rust: nightly
 
 script:
   - |
       case "$TRAVIS_RUST_VERSION" in
-          1.15.0)
-              cargo build
-              ;;
           nightly)
               cargo test
               cargo clean

Cargo.toml

@@ -2,6 +2,7 @@
 name = "ref-cast"
 version = "0.2.5" # remember to update html_root_url
 authors = ["David Tolnay <[email protected]>"]
+edition = "2018"
 license = "MIT/Apache-2.0"
 description = "Safely cast &T to &U where the struct U contains a single field of type T."
 repository = "https://github.com/dtolnay/ref-cast"

README.md

@@ -16,8 +16,6 @@ ref-cast = "0.2"
 ## Basic example
 
 ```rust
-#[macro_use]
-extern crate ref_cast;
 use ref_cast::RefCast;
 
 #[derive(RefCast)]

compiletest/Cargo.toml

@@ -9,5 +9,5 @@ name = "ref-cast-compiletest"
 path = "main.rs"
 
 [dependencies]
-compiletest_rs = { version = "0.3", features = ["stable"] }
+compiletest = { package = "compiletest_rs", version = "0.3", features = ["stable"] }
 ref-cast = { path = ".." }

compiletest/main.rs

@@ -1,7 +1,5 @@
 #![cfg(test)]
 
-extern crate compiletest_rs as compiletest;
-
 #[test]
 fn compile_fail() {
     let mut config = compiletest::Config {

derive/Cargo.toml

@@ -2,6 +2,7 @@
 name = "ref-cast-impl"
 version = "0.2.5"
 authors = ["David Tolnay <[email protected]>"]
+edition = "2018"
 license = "MIT/Apache-2.0"
 description = "Derive implementation for ref_cast::RefCast."
 repository = "https://github.com/dtolnay/ref-cast"

derive/src/lib.rs

@@ -1,15 +1,10 @@
 #![recursion_limit = "128"]
 
 extern crate proc_macro;
-use proc_macro::TokenStream;
-
-#[macro_use]
-extern crate syn;
-
-#[macro_use]
-extern crate quote;
 
-use syn::{Data, DeriveInput, Fields, Meta, NestedMeta, Type};
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::{parse_macro_input, Data, DeriveInput, Fields, Meta, NestedMeta, Type};
 
 #[proc_macro_derive(RefCast)]
 pub fn derive_ref_cast(input: TokenStream) -> TokenStream {
@@ -29,8 +24,6 @@ pub fn derive_ref_cast(input: TokenStream) -> TokenStream {
 
             #[inline]
             fn ref_cast(_from: &Self::From) -> &Self {
-                extern crate core as _core;
-
                 // TODO: assert that `Self::From` and `Self` have the same size
                 // and alignment.
                 //
@@ -58,7 +51,6 @@ pub fn derive_ref_cast(input: TokenStream) -> TokenStream {
 
             #[inline]
             fn ref_cast_mut(_from: &mut Self::From) -> &mut Self {
-                extern crate core as _core;
                 unsafe {
                     &mut *(_from as *mut Self::From as *mut Self)
                 }

src/lib.rs

@@ -1,8 +1,6 @@
 //! # Basic example
 //!
-//! ```rust
-//! #[macro_use]
-//! extern crate ref_cast;
+//! ```
 //! use ref_cast::RefCast;
 //!
 //! #[derive(RefCast)]
@@ -24,7 +22,7 @@
 //! operation that works in column-major order because it is more intuitive in
 //! the context of our application.
 //!
-//! ```rust
+//! ```
 //! const MAP_WIDTH: usize = 4;
 //!
 //! struct Tile(u8);
@@ -42,7 +40,7 @@
 //!
 //! [`Index`]: https://doc.rust-lang.org/std/ops/trait.Index.html
 //!
-//! ```rust
+//! ```
 //! # const MAP_WIDTH: usize = 4;
 //! #
 //! # struct Tile(u8);
@@ -90,11 +88,8 @@
 //!
 //! Here is a working approach using `RefCast`.
 //!
-//! ```rust
-//! # #[macro_use]
-//! # extern crate ref_cast;
+//! ```
 //! # use ref_cast::RefCast;
-//! #
 //! # use std::ops::Index;
 //! #
 //! # const MAP_WIDTH: usize = 4;
@@ -130,19 +125,14 @@
 
 #![doc(html_root_url = "https://docs.rs/ref-cast/0.2.5")]
 
-#[cfg_attr(feature = "cargo-clippy", allow(useless_attribute))]
-#[allow(unused_imports)]
-#[macro_use]
-extern crate ref_cast_impl;
 #[doc(hidden)]
 pub use ref_cast_impl::*;
 
 /// Safely cast `&T` to `&U` where the struct `U` contains a single field of
 /// type `T`.
 ///
-/// ```rust
-/// # #[macro_use]
-/// # extern crate ref_cast;
+/// ```
+/// # use ref_cast::RefCast;
 /// #
 /// // `&String` can be cast to `&U`.
 /// #[derive(RefCast)]