Auto merge of #49561 - Mark-Simulacrum:rollup, r=Mark-Simulacrum

Rollup of 3 pull requests

- Successful merges: #49451, #49498, #49549
- Failed merges:

10 files changed, 121 insertions, 44 deletions

diff --git a/src/Cargo.lock b/src/Cargo.lock
index 1f7cf84cedb..8729335faba 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -152,9 +152,6 @@ dependencies = [
 [[package]]
 name = "build_helper"
 version = "0.1.0"
-dependencies = [
- "filetime 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "byteorder"
@@ -270,11 +267,11 @@ dependencies = [
 
 [[package]]
 name = "clippy"
-version = "0.0.189"
+version = "0.0.191"
 dependencies = [
  "cargo_metadata 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "clippy-mini-macro-test 0.2.0",
- "clippy_lints 0.0.189",
+ "clippy_lints 0.0.191",
  "compiletest_rs 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "derive-new 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -291,6 +288,26 @@ version = "0.2.0"
 [[package]]
 name = "clippy_lints"
 version = "0.0.189"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "if_chain 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itertools 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pulldown-cmark 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quine-mc_cluskey 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "toml 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-normalization 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "clippy_lints"
+version = "0.0.191"
 dependencies = [
  "if_chain 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1398,7 +1415,7 @@ version = "0.126.0"
 dependencies = [
  "cargo 0.27.0",
  "cargo_metadata 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "clippy_lints 0.0.189",
+ "clippy_lints 0.0.189 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "json 0.11.12 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2631,6 +2648,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
 "checksum chrono 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7c20ebe0b2b08b0aeddba49c609fe7957ba2e33449882cb186a180bc60682fa9"
 "checksum clap 2.31.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f0f16b89cbb9ee36d87483dc939fe9f1e13c05898d56d7b230a0d4dff033a536"
+"checksum clippy_lints 0.0.189 (registry+https://github.com/rust-lang/crates.io-index)" = "fef652630bbf8c5e89601220abd000f5057e8fa9db608484b5ebaad98e9bce53"
 "checksum cmake 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)" = "56d741ea7a69e577f6d06b36b7dff4738f680593dc27a701ffa8506b73ce28bb"
 "checksum commoncrypto 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d056a8586ba25a1e4d61cb090900e495952c7886786fc55f909ab2f819b69007"
 "checksum commoncrypto-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1fed34f46747aa73dfaa578069fd8279d2818ade2b55f38f22a9401c7f4083e2"
diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index 9f33935b6e9..e6aa78fba52 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -1120,7 +1120,7 @@ pub fn run_cargo(build: &Build, cargo: &mut Command, stamp: &Path, is_check: boo
     let max = max.unwrap();
     let max_path = max_path.unwrap();
     if stamp_contents == new_contents && max <= stamp_mtime {
-        build.verbose(&format!("not updating {:?}; contents equal and {} <= {}",
+        build.verbose(&format!("not updating {:?}; contents equal and {:?} <= {:?}",
                 stamp, max, stamp_mtime));
         return deps
     }
diff --git a/src/build_helper/Cargo.toml b/src/build_helper/Cargo.toml
index f8ade0616a5..01d704f816b 100644
--- a/src/build_helper/Cargo.toml
+++ b/src/build_helper/Cargo.toml
@@ -6,6 +6,3 @@ authors = ["The Rust Project Developers"]
 [lib]
 name = "build_helper"
 path = "lib.rs"
-
-[dependencies]
-filetime = "0.1"
diff --git a/src/build_helper/lib.rs b/src/build_helper/lib.rs
index 363bbd79544..5a12afd03e1 100644
--- a/src/build_helper/lib.rs
+++ b/src/build_helper/lib.rs
@@ -10,14 +10,11 @@
 
 #![deny(warnings)]
 
-extern crate filetime;
-
 use std::fs::File;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
 use std::{fs, env};
-
-use filetime::FileTime;
+use std::time::{SystemTime, UNIX_EPOCH};
 
 /// A helper macro to `unwrap` a result except also print out details like:
 ///
@@ -137,10 +134,8 @@ pub fn rerun_if_changed_anything_in_dir(dir: &Path) {
 }
 
 /// Returns the last-modified time for `path`, or zero if it doesn't exist.
-pub fn mtime(path: &Path) -> FileTime {
-    fs::metadata(path).map(|f| {
-        FileTime::from_last_modification_time(&f)
-    }).unwrap_or(FileTime::zero())
+pub fn mtime(path: &Path) -> SystemTime {
+    fs::metadata(path).and_then(|f| f.modified()).unwrap_or(UNIX_EPOCH)
 }
 
 /// Returns whether `dst` is up to date given that the file or files in `src`
@@ -157,9 +152,9 @@ pub fn up_to_date(src: &Path, dst: &Path) -> bool {
         Err(e) => panic!("source {:?} failed to get metadata: {}", src, e),
     };
     if meta.is_dir() {
-        dir_up_to_date(src, &threshold)
+        dir_up_to_date(src, threshold)
     } else {
-        FileTime::from_last_modification_time(&meta) <= threshold
+        meta.modified().unwrap_or(UNIX_EPOCH) <= threshold
     }
 }
 
@@ -226,13 +221,13 @@ pub fn sanitizer_lib_boilerplate(sanitizer_name: &str) -> Result<NativeLibBoiler
                            search_path)
 }
 
-fn dir_up_to_date(src: &Path, threshold: &FileTime) -> bool {
+fn dir_up_to_date(src: &Path, threshold: SystemTime) -> bool {
     t!(fs::read_dir(src)).map(|e| t!(e)).all(|e| {
         let meta = t!(e.metadata());
         if meta.is_dir() {
             dir_up_to_date(&e.path(), threshold)
         } else {
-            FileTime::from_last_modification_time(&meta) < *threshold
+            meta.modified().unwrap_or(UNIX_EPOCH) < threshold
         }
     })
 }
diff --git a/src/doc/rustdoc/src/unstable-features.md b/src/doc/rustdoc/src/unstable-features.md
index 44b9145a8c2..bf97fb46861 100644
--- a/src/doc/rustdoc/src/unstable-features.md
+++ b/src/doc/rustdoc/src/unstable-features.md
@@ -348,6 +348,19 @@ details.
 
 [issue-display-warnings]: https://github.com/rust-lang/rust/issues/41574
 
+### `--edition`: control the edition of docs and doctests
+
+Using this flag looks like this:
+
+```bash
+$ rustdoc src/lib.rs -Z unstable-options --edition 2018
+$ rustdoc --test src/lib.rs -Z unstable-options --edition 2018
+```
+
+This flag allows rustdoc to treat your rust code as the given edition. It will compile doctests with
+the given edition as well. As with `rustc`, the default edition that `rustdoc` will use is `2015`
+(the first edition).
+
 ### `-Z force-unstable-if-unmarked`
 
 Using this flag looks like this:
diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
index 462866e05da..6e2be2610ce 100644
--- a/src/librustdoc/core.rs
+++ b/src/librustdoc/core.rs
@@ -26,6 +26,7 @@ use rustc_back::target::TargetTriple;
 
 use syntax::ast::NodeId;
 use syntax::codemap;
+use syntax::edition::Edition;
 use syntax::feature_gate::UnstableFeatures;
 use errors;
 use errors::emitter::ColorConfig;
@@ -123,7 +124,8 @@ pub fn run_core(search_paths: SearchPaths,
                 maybe_sysroot: Option<PathBuf>,
                 allow_warnings: bool,
                 crate_name: Option<String>,
-                force_unstable_if_unmarked: bool) -> (clean::Crate, RenderInfo)
+                force_unstable_if_unmarked: bool,
+                edition: Edition) -> (clean::Crate, RenderInfo)
 {
     // Parse, resolve, and typecheck the given crate.
 
@@ -148,6 +150,7 @@ pub fn run_core(search_paths: SearchPaths,
         actually_rustdoc: true,
         debugging_opts: config::DebuggingOptions {
             force_unstable_if_unmarked,
+            edition,
             ..config::basic_debugging_options()
         },
         ..config::basic_options().clone()
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 66369e86006..e31390f59e2 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -61,6 +61,7 @@ use std::path::{Path, PathBuf};
 use std::process;
 use std::sync::mpsc::channel;
 
+use syntax::edition::Edition;
 use externalfiles::ExternalHtml;
 use rustc::session::search_paths::SearchPaths;
 use rustc::session::config::{ErrorOutputType, RustcOptGroup, nightly_options, Externs};
@@ -271,6 +272,11 @@ pub fn opts() -> Vec<RustcOptGroup> {
                       \"light-suffix.css\"",
                      "PATH")
         }),
+        unstable("edition", |o| {
+            o.optopt("", "edition",
+                     "edition to use when compiling rust code (default: 2015)",
+                     "EDITION")
+        }),
     ]
 }
 
@@ -429,14 +435,23 @@ pub fn main_args(args: &[String]) -> isize {
     let sort_modules_alphabetically = !matches.opt_present("sort-modules-by-appearance");
     let resource_suffix = matches.opt_str("resource-suffix");
 
+    let edition = matches.opt_str("edition").unwrap_or("2015".to_string());
+    let edition = match edition.parse() {
+        Ok(e) => e,
+        Err(_) => {
+            print_error("could not parse edition");
+            return 1;
+        }
+    };
+
     match (should_test, markdown_input) {
         (true, true) => {
             return markdown::test(input, cfgs, libs, externs, test_args, maybe_sysroot,
-                                  display_warnings, linker)
+                                  display_warnings, linker, edition)
         }
         (true, false) => {
             return test::run(Path::new(input), cfgs, libs, externs, test_args, crate_name,
-                             maybe_sysroot, display_warnings, linker)
+                             maybe_sysroot, display_warnings, linker, edition)
         }
         (false, true) => return markdown::render(Path::new(input),
                                                  output.unwrap_or(PathBuf::from("doc")),
@@ -446,7 +461,7 @@ pub fn main_args(args: &[String]) -> isize {
     }
 
     let output_format = matches.opt_str("w");
-    let res = acquire_input(PathBuf::from(input), externs, &matches, move |out| {
+    let res = acquire_input(PathBuf::from(input), externs, edition, &matches, move |out| {
         let Output { krate, passes, renderinfo } = out;
         info!("going to format");
         match output_format.as_ref().map(|s| &**s) {
@@ -487,14 +502,15 @@ fn print_error<T>(error_message: T) where T: Display {
 /// and files and then generates the necessary rustdoc output for formatting.
 fn acquire_input<R, F>(input: PathBuf,
                        externs: Externs,
+                       edition: Edition,
                        matches: &getopts::Matches,
                        f: F)
                        -> Result<R, String>
 where R: 'static + Send, F: 'static + Send + FnOnce(Output) -> R {
     match matches.opt_str("r").as_ref().map(|s| &**s) {
-        Some("rust") => Ok(rust_input(input, externs, matches, f)),
+        Some("rust") => Ok(rust_input(input, externs, edition, matches, f)),
         Some(s) => Err(format!("unknown input format: {}", s)),
-        None => Ok(rust_input(input, externs, matches, f))
+        None => Ok(rust_input(input, externs, edition, matches, f))
     }
 }
 
@@ -520,8 +536,14 @@ fn parse_externs(matches: &getopts::Matches) -> Result<Externs, String> {
 /// generated from the cleaned AST of the crate.
 ///
 /// This form of input will run all of the plug/cleaning passes
-fn rust_input<R, F>(cratefile: PathBuf, externs: Externs, matches: &getopts::Matches, f: F) -> R
-where R: 'static + Send, F: 'static + Send + FnOnce(Output) -> R {
+fn rust_input<R, F>(cratefile: PathBuf,
+                    externs: Externs,
+                    edition: Edition,
+                    matches: &getopts::Matches,
+                    f: F) -> R
+where R: 'static + Send,
+      F: 'static + Send + FnOnce(Output) -> R
+{
     let mut default_passes = !matches.opt_present("no-defaults");
     let mut passes = matches.opt_strs("passes");
     let mut plugins = matches.opt_strs("plugins");
@@ -570,7 +592,7 @@ where R: 'static + Send, F: 'static + Send + FnOnce(Output) -> R {
         let (mut krate, renderinfo) =
             core::run_core(paths, cfgs, externs, Input::File(cratefile), triple, maybe_sysroot,
                            display_warnings, crate_name.clone(),
-                           force_unstable_if_unmarked);
+                           force_unstable_if_unmarked, edition);
 
         info!("finished with rustc");
 
diff --git a/src/librustdoc/markdown.rs b/src/librustdoc/markdown.rs
index 3a55b279b5c..daa8966b104 100644
--- a/src/librustdoc/markdown.rs
+++ b/src/librustdoc/markdown.rs
@@ -18,6 +18,7 @@ use testing;
 use rustc::session::search_paths::SearchPaths;
 use rustc::session::config::Externs;
 use syntax::codemap::DUMMY_SP;
+use syntax::edition::Edition;
 
 use externalfiles::{ExternalHtml, LoadStringError, load_string};
 
@@ -139,7 +140,7 @@ pub fn render(input: &Path, mut output: PathBuf, matches: &getopts::Matches,
 /// Run any tests/code examples in the markdown file `input`.
 pub fn test(input: &str, cfgs: Vec<String>, libs: SearchPaths, externs: Externs,
             mut test_args: Vec<String>, maybe_sysroot: Option<PathBuf>,
-            display_warnings: bool, linker: Option<PathBuf>) -> isize {
+            display_warnings: bool, linker: Option<PathBuf>, edition: Edition) -> isize {
     let input_str = match load_string(input) {
         Ok(s) => s,
         Err(LoadStringError::ReadFail) => return 1,
@@ -151,7 +152,7 @@ pub fn test(input: &str, cfgs: Vec<String>, libs: SearchPaths, externs: Externs,
     let mut collector = Collector::new(input.to_owned(), cfgs, libs, externs,
                                        true, opts, maybe_sysroot, None,
                                        Some(PathBuf::from(input)),
-                                       linker);
+                                       linker, edition);
     find_testable_code(&input_str, &mut collector, DUMMY_SP, None);
     test_args.insert(0, "rustdoctest".to_string());
     testing::test_main(&test_args, collector.tests,
diff --git a/src/librustdoc/test.rs b/src/librustdoc/test.rs
index 8ab9ca45187..ab11b0d62e9 100644
--- a/src/librustdoc/test.rs
+++ b/src/librustdoc/test.rs
@@ -34,6 +34,7 @@ use rustc_metadata::cstore::CStore;
 use rustc_resolve::MakeGlobMap;
 use syntax::ast;
 use syntax::codemap::CodeMap;
+use syntax::edition::Edition;
 use syntax::feature_gate::UnstableFeatures;
 use syntax::with_globals;
 use syntax_pos::{BytePos, DUMMY_SP, Pos, Span, FileName};
@@ -57,7 +58,8 @@ pub fn run(input_path: &Path,
            crate_name: Option<String>,
            maybe_sysroot: Option<PathBuf>,
            display_warnings: bool,
-           linker: Option<PathBuf>)
+           linker: Option<PathBuf>,
+           edition: Edition)
            -> isize {
     let input = config::Input::File(input_path.to_owned());
 
@@ -70,6 +72,10 @@ pub fn run(input_path: &Path,
         unstable_features: UnstableFeatures::from_environment(),
         lint_cap: Some(::rustc::lint::Level::Allow),
         actually_rustdoc: true,
+        debugging_opts: config::DebuggingOptions {
+            edition,
+            ..config::basic_debugging_options()
+        },
         ..config::basic_options().clone()
     };
 
@@ -117,7 +123,8 @@ pub fn run(input_path: &Path,
                                        maybe_sysroot,
                                        Some(codemap),
                                        None,
-                                       linker);
+                                       linker,
+                                       edition);
 
     {
         let map = hir::map::map_crate(&sess, &cstore, &mut hir_forest, &defs);
@@ -177,8 +184,7 @@ fn run_test(test: &str, cratename: &str, filename: &FileName, line: usize,
             externs: Externs,
             should_panic: bool, no_run: bool, as_test_harness: bool,
             compile_fail: bool, mut error_codes: Vec<String>, opts: &TestOptions,
-            maybe_sysroot: Option<PathBuf>,
-            linker: Option<PathBuf>) {
+            maybe_sysroot: Option<PathBuf>, linker: Option<PathBuf>, edition: Edition) {
     // the test harness wants its own `main` & top level functions, so
     // never wrap the test in `fn main() { ... }`
     let (test, line_offset) = make_test(test, Some(cratename), as_test_harness, opts);
@@ -204,6 +210,10 @@ fn run_test(test: &str, cratename: &str, filename: &FileName, line: usize,
         },
         test: as_test_harness,
         unstable_features: UnstableFeatures::from_environment(),
+        debugging_opts: config::DebuggingOptions {
+            edition,
+            ..config::basic_debugging_options()
+        },
         ..config::basic_options().clone()
     };
 
@@ -465,13 +475,14 @@ pub struct Collector {
     codemap: Option<Lrc<CodeMap>>,
     filename: Option<PathBuf>,
     linker: Option<PathBuf>,
+    edition: Edition,
 }
 
 impl Collector {
     pub fn new(cratename: String, cfgs: Vec<String>, libs: SearchPaths, externs: Externs,
                use_headers: bool, opts: TestOptions, maybe_sysroot: Option<PathBuf>,
                codemap: Option<Lrc<CodeMap>>, filename: Option<PathBuf>,
-               linker: Option<PathBuf>) -> Collector {
+               linker: Option<PathBuf>, edition: Edition) -> Collector {
         Collector {
             tests: Vec::new(),
             names: Vec::new(),
@@ -486,6 +497,7 @@ impl Collector {
             codemap,
             filename,
             linker,
+            edition,
         }
     }
 
@@ -505,6 +517,7 @@ impl Collector {
         let opts = self.opts.clone();
         let maybe_sysroot = self.maybe_sysroot.clone();
         let linker = self.linker.clone();
+        let edition = self.edition;
         debug!("Creating test {}: {}", name, test);
         self.tests.push(testing::TestDescAndFn {
             desc: testing::TestDesc {
@@ -535,7 +548,8 @@ impl Collector {
                                  error_codes,
                                  &opts,
                                  maybe_sysroot,
-                                 linker)
+                                 linker,
+                                 edition)
                     }))
                 } {
                     Ok(()) => (),
diff --git a/src/tools/clippy b/src/tools/clippy
-Subproject b75618206cec71bd87ff7b07f0a8698ee854a2d
+Subproject b45801ff192e6f1bd3504c05e612a1004f52a24