Update to edition 2018

Author: kornelski

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         rust:
-          - 1.30.0
+          - 1.31.0
           - stable
           - beta
           - nightly

Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-
 name = "pkg-config"
 version = "0.3.30"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
@@ -12,7 +11,8 @@ A library to run the pkg-config system tool at build time in order to be used in
 Cargo build scripts.
 """
 keywords = ["build-dependencies"]
-rust-version = "1.30"
+rust-version = "1.31"
+edition = "2018"
 
 [dev-dependencies]
 lazy_static = "1"

README.md

@@ -1,7 +1,7 @@
 # pkg-config-rs
 
 [![Build Status](https://github.com/rust-lang/pkg-config-rs/actions/workflows/ci.yml/badge.svg)](https://github.com/rust-lang/pkg-config-rs/actions)
-[![Rust](https://img.shields.io/badge/rust-1.30%2B-blue.svg?maxAge=3600)](https://github.com/rust-lang/pkg-config-rs/)
+[![Rust](https://img.shields.io/badge/rust-1.31%2B-blue.svg?maxAge=3600)](https://github.com/rust-lang/pkg-config-rs/)
 
 [Documentation](https://docs.rs/pkg-config)
 
@@ -13,7 +13,7 @@ You can use this crate directly to probe for specific libraries, or use
 [system-deps](https://github.com/gdesmott/system-deps) to declare all your
 `pkg-config` dependencies in `Cargo.toml`.
 
-This library requires Rust 1.30+.
+This library requires Rust 1.31+.
 
 # Example
 

src/lib.rs

@@ -259,14 +259,14 @@ impl Display for WrappedCommand {
 impl error::Error for Error {}
 
 impl fmt::Debug for Error {
-    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
         // Failed `unwrap()` prints Debug representation, but the default debug format lacks helpful instructions for the end users
         <Error as fmt::Display>::fmt(self, f)
     }
 }
 
 impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
         match *self {
             Error::EnvNoPkgConfig(ref name) => write!(f, "Aborted because {} is set", name),
             Error::CrossCompilation => f.write_str(
@@ -407,7 +407,7 @@ impl fmt::Display for Error {
     }
 }
 
-fn format_output(output: &Output, f: &mut fmt::Formatter) -> fmt::Result {
+fn format_output(output: &Output, f: &mut fmt::Formatter<'_>) -> fmt::Result {
     let stdout = String::from_utf8_lossy(&output.stdout);
     if !stdout.is_empty() {
         write!(f, "\n--- stdout\n{}", stdout)?;

tests/test.rs

@@ -1,7 +1,4 @@
-extern crate pkg_config;
-#[macro_use]
-extern crate lazy_static;
-
+use lazy_static::lazy_static;
 use pkg_config::Error;
 use std::env;
 use std::path::PathBuf;