Rollup merge of #98165 - WaffleLapkin:once_things_renamings, r=m-ou-se

once cell renamings

This PR does the renamings proposed in https://github.com/rust-lang/rust/issues/74465#issuecomment-1153703128

- Move/rename `lazy::{OnceCell, Lazy}` to `cell::{OnceCell, LazyCell}`
- Move/rename `lazy::{SyncOnceCell, SyncLazy}` to `sync::{OnceLock, LazyLock}`

(I used `Lazy...` instead of `...Lazy` as it seems to be more consistent, easier to pronounce, etc)

```@rustbot``` label +T-libs-api -T-libs

clippy_dev/src/bless.rs

@@ -4,12 +4,12 @@
 use crate::cargo_clippy_path;
 use std::ffi::OsStr;
 use std::fs;
-use std::lazy::SyncLazy;
 use std::path::{Path, PathBuf};
+use std::sync::LazyLock;
 use walkdir::{DirEntry, WalkDir};
 
-static CLIPPY_BUILD_TIME: SyncLazy<Option<std::time::SystemTime>> =
-    SyncLazy::new(|| cargo_clippy_path().metadata().ok()?.modified().ok());
+static CLIPPY_BUILD_TIME: LazyLock<Option<std::time::SystemTime>> =
+    LazyLock::new(|| cargo_clippy_path().metadata().ok()?.modified().ok());
 
 /// # Panics
 ///

clippy_utils/src/lib.rs

@@ -64,7 +64,7 @@
 
 use std::collections::hash_map::Entry;
 use std::hash::BuildHasherDefault;
-use std::lazy::SyncOnceCell;
+use std::sync::OnceLock;
 use std::sync::{Mutex, MutexGuard};
 
 use if_chain::if_chain;
@@ -2080,7 +2080,7 @@ pub fn is_hir_ty_cfg_dependant(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> bool {
     false
 }
 
-static TEST_ITEM_NAMES_CACHE: SyncOnceCell<Mutex<FxHashMap<LocalDefId, Vec<Symbol>>>> = SyncOnceCell::new();
+static TEST_ITEM_NAMES_CACHE: OnceLock<Mutex<FxHashMap<LocalDefId, Vec<Symbol>>>> = OnceLock::new();
 
 fn with_test_item_names<'tcx>(tcx: TyCtxt<'tcx>, module: LocalDefId, f: impl Fn(&[Symbol]) -> bool) -> bool {
     let cache = TEST_ITEM_NAMES_CACHE.get_or_init(|| Mutex::new(FxHashMap::default()));

src/driver.rs

@@ -21,11 +21,11 @@
 
 use std::borrow::Cow;
 use std::env;
-use std::lazy::SyncLazy;
 use std::ops::Deref;
 use std::panic;
 use std::path::{Path, PathBuf};
 use std::process::{exit, Command};
+use std::sync::LazyLock;
 
 /// If a command-line option matches `find_arg`, then apply the predicate `pred` on its value. If
 /// true, then return it. The parameter is assumed to be either `--arg=value` or `--arg value`.
@@ -152,7 +152,7 @@ fn display_help() {
 
 const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust-clippy/issues/new";
 
-static ICE_HOOK: SyncLazy<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send + 'static>> = SyncLazy::new(|| {
+static ICE_HOOK: LazyLock<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send + 'static>> = LazyLock::new(|| {
     let hook = panic::take_hook();
     panic::set_hook(Box::new(|info| report_clippy_ice(info, BUG_REPORT_URL)));
     hook
@@ -219,7 +219,7 @@ fn toolchain_path(home: Option<String>, toolchain: Option<String>) -> Option<Pat
 #[allow(clippy::too_many_lines)]
 pub fn main() {
     rustc_driver::init_rustc_env_logger();
-    SyncLazy::force(&ICE_HOOK);
+    LazyLock::force(&ICE_HOOK);
     exit(rustc_driver::catch_with_exit_code(move || {
         let mut orig_args: Vec<String> = env::args().collect();
 

tests/compile-test.rs

@@ -12,8 +12,8 @@
 use std::ffi::{OsStr, OsString};
 use std::fs;
 use std::io;
-use std::lazy::SyncLazy;
 use std::path::{Path, PathBuf};
+use std::sync::LazyLock;
 use test_utils::IS_RUSTC_TEST_SUITE;
 
 mod test_utils;
@@ -69,7 +69,7 @@
 /// dependencies must be added to Cargo.toml at the project root. Test
 /// dependencies that are not *directly* used by this test module require an
 /// `extern crate` declaration.
-static EXTERN_FLAGS: SyncLazy<String> = SyncLazy::new(|| {
+static EXTERN_FLAGS: LazyLock<String> = LazyLock::new(|| {
     let current_exe_depinfo = {
         let mut path = env::current_exe().unwrap();
         path.set_extension("d");

tests/test_utils/mod.rs

@@ -1,9 +1,9 @@
 #![allow(dead_code)] // see https://github.com/rust-lang/rust/issues/46379
 
-use std::lazy::SyncLazy;
 use std::path::PathBuf;
+use std::sync::LazyLock;
 
-pub static CARGO_CLIPPY_PATH: SyncLazy<PathBuf> = SyncLazy::new(|| {
+pub static CARGO_CLIPPY_PATH: LazyLock<PathBuf> = LazyLock::new(|| {
     let mut path = std::env::current_exe().unwrap();
     assert!(path.pop()); // deps
     path.set_file_name("cargo-clippy");