Remove alias rustc_data_structures::sync::OnceLock

Author: Zalathar

compiler/rustc_data_structures/src/sync.rs

@@ -97,7 +97,6 @@ mod mode {
 
 // FIXME(parallel_compiler): Get rid of these aliases across the compiler.
 
-pub use std::sync::OnceLock;
 // Use portable AtomicU64 for targets without native 64-bit atomics
 #[cfg(target_has_atomic = "64")]
 pub use std::sync::atomic::AtomicU64;

compiler/rustc_interface/src/passes.rs

@@ -2,14 +2,14 @@ use std::any::Any;
 use std::ffi::OsString;
 use std::io::{self, BufWriter, Write};
 use std::path::{Path, PathBuf};
-use std::sync::{Arc, LazyLock};
+use std::sync::{Arc, LazyLock, OnceLock};
 use std::{env, fs, iter};
 
 use rustc_ast as ast;
 use rustc_codegen_ssa::traits::CodegenBackend;
 use rustc_data_structures::parallel;
 use rustc_data_structures::steal::Steal;
-use rustc_data_structures::sync::{AppendOnlyIndexVec, FreezeLock, OnceLock, WorkerLocal};
+use rustc_data_structures::sync::{AppendOnlyIndexVec, FreezeLock, WorkerLocal};
 use rustc_expand::base::{ExtCtxt, LintStoreExpand};
 use rustc_feature::Features;
 use rustc_fs_util::try_canonicalize;

compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -2,7 +2,7 @@
 
 use std::iter::TrustedLen;
 use std::path::Path;
-use std::sync::Arc;
+use std::sync::{Arc, OnceLock};
 use std::{io, iter, mem};
 
 pub(super) use cstore_impl::provide;
@@ -11,7 +11,7 @@ use rustc_ast as ast;
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::owned_slice::OwnedSlice;
-use rustc_data_structures::sync::{Lock, OnceLock};
+use rustc_data_structures::sync::Lock;
 use rustc_data_structures::unhash::UnhashMap;
 use rustc_expand::base::{SyntaxExtension, SyntaxExtensionKind};
 use rustc_expand::proc_macro::{AttrProcMacro, BangProcMacro, DeriveProcMacro};

compiler/rustc_middle/src/mir/basic_blocks.rs

@@ -1,8 +1,9 @@
+use std::sync::OnceLock;
+
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::graph;
 use rustc_data_structures::graph::dominators::{Dominators, dominators};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
-use rustc_data_structures::sync::OnceLock;
 use rustc_index::{IndexSlice, IndexVec};
 use rustc_macros::{HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable};
 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};

compiler/rustc_query_system/src/query/caches.rs

@@ -1,9 +1,9 @@
 use std::fmt::Debug;
 use std::hash::Hash;
+use std::sync::OnceLock;
 
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sharded::{self, Sharded};
-use rustc_data_structures::sync::OnceLock;
 pub use rustc_data_structures::vec_cache::VecCache;
 use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_index::Idx;

src/doc/rustc-dev-guide/src/parallel-rustc.md

@@ -46,7 +46,6 @@ are implemented differently depending on whether `parallel-compiler` is true.
 
 | data structure                   | parallel                                            | non-parallel |
 | -------------------------------- | --------------------------------------------------- | ------------ |
-| OnceCell                         | std::sync::OnceLock                                 | std::cell::OnceCell |
 | Lock\<T> | (parking_lot::Mutex\<T>) | (std::cell::RefCell) |
 | RwLock\<T> | (parking_lot::RwLock\<T>) | (std::cell::RefCell) |
 | MTRef<'a, T> | &'a T | &'a mut T |