Rollup merge of #58091 - phansch:compiletest2018, r=Centril

Transition compiletest to Rust 2018

This transitions `src/tools/compiletest` to Rust 2018.

cc #58099

src/tools/compiletest/Cargo.toml

@@ -2,6 +2,7 @@
 authors = ["The Rust Project Developers"]
 name = "compiletest"
 version = "0.0.0"
+edition = "2018"
 
 [dependencies]
 diff = "0.1.10"

src/tools/compiletest/src/common.rs

@@ -5,7 +5,7 @@
 use std::str::FromStr;
 
 use test::ColorConfig;
-use util::PathBufExt;
+use crate::util::PathBufExt;
 
 #[derive(Clone, Copy, PartialEq, Debug)]
 pub enum Mode {
@@ -66,7 +66,7 @@ fn from_str(s: &str) -> Result<Mode, ()> {
 }
 
 impl fmt::Display for Mode {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let s = match *self {
             CompileFail => "compile-fail",
             RunFail => "run-fail",

src/tools/compiletest/src/errors.rs

@@ -33,7 +33,7 @@ fn from_str(s: &str) -> Result<Self, Self::Err> {
 }
 
 impl fmt::Display for ErrorKind {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self {
             ErrorKind::Help => write!(f, "help message"),
             ErrorKind::Error => write!(f, "error"),

src/tools/compiletest/src/header.rs

@@ -4,10 +4,10 @@
 use std::io::BufReader;
 use std::path::{Path, PathBuf};
 
-use common::{self, CompareMode, Config, Mode};
-use util;
+use crate::common::{self, CompareMode, Config, Mode};
+use crate::util;
 
-use extract_gdb_version;
+use crate::extract_gdb_version;
 
 /// Whether to ignore the test.
 #[derive(Clone, Copy, PartialEq, Debug)]

src/tools/compiletest/src/json.rs

-use errors::{Error, ErrorKind};
-use runtest::ProcRes;
+use crate::errors::{Error, ErrorKind};
+use crate::runtest::ProcRes;
 use serde_json;
 use std::path::Path;
 use std::str::FromStr;

src/tools/compiletest/src/main.rs

 #![crate_name = "compiletest"]
 #![feature(test)]
-#![deny(warnings)]
+#![deny(warnings, rust_2018_idioms)]
 
-extern crate diff;
-extern crate env_logger;
-extern crate filetime;
-extern crate getopts;
 #[cfg(unix)]
 extern crate libc;
 #[macro_use]
 extern crate log;
-extern crate regex;
 #[macro_use]
 extern crate lazy_static;
 #[macro_use]
 extern crate serde_derive;
-extern crate serde_json;
 extern crate test;
-extern crate rustfix;
-extern crate walkdir;
 
-use common::CompareMode;
-use common::{expected_output_path, output_base_dir, output_relative_path, UI_EXTENSIONS};
-use common::{Config, TestPaths};
-use common::{DebugInfoBoth, DebugInfoGdb, DebugInfoLldb, Mode, Pretty};
+use crate::common::CompareMode;
+use crate::common::{expected_output_path, output_base_dir, output_relative_path, UI_EXTENSIONS};
+use crate::common::{Config, TestPaths};
+use crate::common::{DebugInfoBoth, DebugInfoGdb, DebugInfoLldb, Mode, Pretty};
 use filetime::FileTime;
 use getopts::Options;
 use std::env;
@@ -33,8 +25,10 @@
 use std::path::{Path, PathBuf};
 use std::process::Command;
 use test::ColorConfig;
-use util::logv;
+use crate::util::logv;
 use walkdir::WalkDir;
+use env_logger;
+use getopts;
 
 use self::header::{EarlyProps, Ignore};
 

src/tools/compiletest/src/read2.rs

@@ -100,18 +100,15 @@ pub fn read2(
 
 #[cfg(windows)]
 mod imp {
-    extern crate miow;
-    extern crate winapi;
-
     use std::io;
     use std::os::windows::prelude::*;
     use std::process::{ChildStderr, ChildStdout};
     use std::slice;
 
-    use self::miow::iocp::{CompletionPort, CompletionStatus};
-    use self::miow::pipe::NamedPipe;
-    use self::miow::Overlapped;
-    use self::winapi::shared::winerror::ERROR_BROKEN_PIPE;
+    use miow::iocp::{CompletionPort, CompletionStatus};
+    use miow::pipe::NamedPipe;
+    use miow::Overlapped;
+    use winapi::shared::winerror::ERROR_BROKEN_PIPE;
 
     struct Pipe<'a> {
         dst: &'a mut Vec<u8>,

src/tools/compiletest/src/runtest.rs

-use common::CompareMode;
-use common::{expected_output_path, UI_EXTENSIONS, UI_FIXED, UI_STDERR, UI_STDOUT};
-use common::{output_base_dir, output_base_name, output_testname_unique};
-use common::{Codegen, CodegenUnits, DebugInfoBoth, DebugInfoGdb, DebugInfoLldb, Rustdoc};
-use common::{CompileFail, Pretty, RunFail, RunPass, RunPassValgrind};
-use common::{Config, TestPaths};
-use common::{Incremental, MirOpt, RunMake, Ui};
+use crate::common::CompareMode;
+use crate::common::{expected_output_path, UI_EXTENSIONS, UI_FIXED, UI_STDERR, UI_STDOUT};
+use crate::common::{output_base_dir, output_base_name, output_testname_unique};
+use crate::common::{Codegen, CodegenUnits, DebugInfoBoth, DebugInfoGdb, DebugInfoLldb, Rustdoc};
+use crate::common::{CompileFail, Pretty, RunFail, RunPass, RunPassValgrind};
+use crate::common::{Config, TestPaths};
+use crate::common::{Incremental, MirOpt, RunMake, Ui};
 use diff;
-use errors::{self, Error, ErrorKind};
+use crate::errors::{self, Error, ErrorKind};
 use filetime::FileTime;
-use header::TestProps;
-use json;
+use crate::header::TestProps;
+use crate::json;
 use regex::Regex;
 use rustfix::{apply_suggestions, get_suggestions_from_json, Filter};
-use util::{logv, PathBufExt};
+use crate::util::{logv, PathBufExt};
 
 use std::collections::hash_map::DefaultHasher;
 use std::collections::{HashMap, HashSet, VecDeque};
@@ -27,8 +27,8 @@
 use std::process::{Child, Command, ExitStatus, Output, Stdio};
 use std::str;
 
-use extract_gdb_version;
-use is_android_gdb_target;
+use crate::extract_gdb_version;
+use crate::is_android_gdb_target;
 
 #[cfg(windows)]
 fn disable_error_reporting<F: FnOnce() -> R, R>(f: F) -> R {
@@ -1937,7 +1937,7 @@ fn split_maybe_args(&self, argstr: &Option<String>) -> Vec<String> {
     }
 
     fn make_cmdline(&self, command: &Command, libpath: &str) -> String {
-        use util;
+        use crate::util;
 
         // Linux and mac don't require adjusting the library search path
         if cfg!(unix) {
@@ -3255,7 +3255,7 @@ fn prune_duplicate_outputs(&self, modes: &[CompareMode]) {
     }
 
     fn create_stamp(&self) {
-        let stamp = ::stamp(&self.config, self.testpaths, self.revision);
+        let stamp = crate::stamp(&self.config, self.testpaths, self.revision);
         fs::write(&stamp, compute_stamp_hash(&self.config)).unwrap();
     }
 }
@@ -3311,7 +3311,7 @@ impl<T> fmt::Debug for ExpectedLine<T>
 where
     T: AsRef<str> + fmt::Debug,
 {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
         if let &ExpectedLine::Text(ref t) = self {
             write!(formatter, "{:?}", t)
         } else {
@@ -3334,7 +3334,7 @@ fn nocomment_mir_line(line: &str) -> &str {
 }
 
 fn read2_abbreviated(mut child: Child) -> io::Result<Output> {
-    use read2::read2;
+    use crate::read2::read2;
     use std::mem::replace;
 
     const HEAD_LEN: usize = 160 * 1024;

src/tools/compiletest/src/util.rs

 use std::ffi::OsStr;
 use std::env;
 use std::path::PathBuf;
-use common::Config;
+use crate::common::Config;
 
 /// Conversion table from triple OS name to Rust SYSNAME
 const OS_TABLE: &'static [(&'static str, &'static str)] = &[