Switch to 2018 edition

Cargo.toml

@@ -8,6 +8,7 @@ readme = "README.md"
 documentation = "https://docs.rs/rustc_version/"
 repository = "https://github.com/Kimundi/rustc-version-rs"
 keywords = ["version", "rustc"]
+edition = "2018"
 
 [badges]
 travis-ci = { repository = "Kimundi/rustc-version-rs" }

src/errors.rs

@@ -87,10 +87,10 @@ pub enum Error {
     /// An error occurred in parsing a `LlvmVersion`.
     LlvmVersionError(LlvmVersionParseError),
 }
-use Error::*;
+use crate::Error::*;
 
 impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self {
             CouldNotExecuteCommand(ref e) => write!(f, "could not execute command: {}", e),
             CommandError {

src/lib.rs

@@ -59,7 +59,6 @@ extern crate doc_comment;
 #[cfg(test)]
 doctest!("../README.md");
 
-extern crate semver;
 use semver::Identifier;
 use std::process::Command;
 use std::{env, fmt, str};
@@ -70,7 +69,7 @@ use std::{ffi::OsString, str::FromStr};
 pub use semver::Version;
 
 mod errors;
-pub use errors::{Error, LlvmVersionParseError, Result};
+pub use crate::errors::{Error, LlvmVersionParseError, Result};
 
 /// Release channel of the compiler.
 #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]

tests/all.rs

@@ -1,7 +1,5 @@
 #![allow(clippy::match_like_matches_macro)]
 
-extern crate rustc_version;
-
 use std::process::Command;
 
 use rustc_version::{