Auto merge of #15542 - Veykril:std-once, r=Veykril

Less `once_cell` more `std`

Cargo.lock

@@ -854,7 +854,6 @@ version = "0.0.0"
 dependencies = [
  "dashmap",
  "hashbrown 0.12.3",
- "once_cell",
  "rustc-hash",
  "triomphe",
 ]

crates/hir-def/src/attr/builtin.rs

@@ -8,7 +8,8 @@
 //! name resolution, and `BUILTIN_ATTRIBUTES` is almost entirely unchanged from the original, to
 //! ease updating.
 
-use once_cell::sync::OnceCell;
+use std::sync::OnceLock;
+
 use rustc_hash::FxHashMap;
 
 /// Ignored attribute namespaces used by tools.
@@ -29,7 +30,7 @@ pub struct AttributeTemplate {
 }
 
 pub fn find_builtin_attr_idx(name: &str) -> Option<usize> {
-    static BUILTIN_LOOKUP_TABLE: OnceCell<FxHashMap<&'static str, usize>> = OnceCell::new();
+    static BUILTIN_LOOKUP_TABLE: OnceLock<FxHashMap<&'static str, usize>> = OnceLock::new();
     BUILTIN_LOOKUP_TABLE
         .get_or_init(|| {
             INERT_ATTRIBUTES.iter().map(|attr| attr.name).enumerate().map(|(a, b)| (b, a)).collect()

crates/hir-def/src/lower.rs

@@ -1,10 +1,11 @@
 //! Context for lowering paths.
+use std::cell::OnceCell;
+
 use hir_expand::{
     ast_id_map::{AstIdMap, AstIdNode},
     hygiene::Hygiene,
     AstId, HirFileId, InFile,
 };
-use once_cell::unsync::OnceCell;
 use syntax::ast;
 use triomphe::Arc;
 

crates/ide/src/typing.rs

@@ -86,17 +86,16 @@ fn on_char_typed_inner(
     if !stdx::always!(TRIGGER_CHARS.contains(char_typed)) {
         return None;
     }
-    return match char_typed {
+    let conv = |text_edit: Option<TextEdit>| {
+        Some(ExtendedTextEdit { edit: text_edit?, is_snippet: false })
+    };
+    match char_typed {
         '.' => conv(on_dot_typed(&file.tree(), offset)),
         '=' => conv(on_eq_typed(&file.tree(), offset)),
         '<' => on_left_angle_typed(&file.tree(), offset),
         '>' => conv(on_right_angle_typed(&file.tree(), offset)),
         '{' => conv(on_opening_brace_typed(file, offset)),
-        _ => return None,
+        _ => None,
-    };
-
-    fn conv(text_edit: Option<TextEdit>) -> Option<ExtendedTextEdit> {
-        Some(ExtendedTextEdit { edit: text_edit?, is_snippet: false })
     }
 }
 

crates/intern/Cargo.toml

@@ -16,6 +16,5 @@ doctest = false
 # We need to freeze the version of the crate, as the raw-api feature is considered unstable
 dashmap = { version = "=5.4.0", features = ["raw-api"] }
 hashbrown.workspace = true
-once_cell = "1.17.0"
 rustc-hash = "1.1.0"
 triomphe.workspace = true

crates/intern/src/lib.rs

@@ -6,11 +6,11 @@ use std::{
     fmt::{self, Debug, Display},
     hash::{BuildHasherDefault, Hash, Hasher},
     ops::Deref,
+    sync::OnceLock,
 };
 
 use dashmap::{DashMap, SharedValue};
 use hashbrown::{hash_map::RawEntryMut, HashMap};
-use once_cell::sync::OnceCell;
 use rustc_hash::FxHasher;
 use triomphe::Arc;
 
@@ -177,12 +177,12 @@ impl<T: Display + Internable + ?Sized> Display for Interned<T> {
 }
 
 pub struct InternStorage<T: ?Sized> {
-    map: OnceCell<InternMap<T>>,
+    map: OnceLock<InternMap<T>>,
 }
 
 impl<T: ?Sized> InternStorage<T> {
     pub const fn new() -> Self {
-        Self { map: OnceCell::new() }
+        Self { map: OnceLock::new() }
     }
 }