lazy_static → once_cell → stabilized versions (#3447)

* Anki: Replace lazy_static with once_cell

Unify to once_cell, lazy_static's replacement. The latter in unmaintained.

* Anki: Replace once_cell with stabilized LazyCell / LazyLock as far as possible

Since 1.80: https://github.com/rust-lang/rust/issues/109736 and https://github.com/rust-lang/rust/pull/98165

Non-Thread-Safe Lazy → std::cell::LazyCell https://doc.rust-lang.org/nightly/std/cell/struct.LazyCell.html

Thread-safe SyncLazy → std::sync::LazyLock https://doc.rust-lang.org/nightly/std/sync/struct.LazyLock.html

The compiler accepted LazyCell only in minilints.

The final use in rslib/src/log.rs couldn't be replaced since get_or_try_init has not yet been standardized: https://github.com/rust-lang/rust/issues/109737

* Declare correct MSRV (dae)

Some of our deps require newer Rust versions, so this was misleading.

Updating the MSRV also allows us to use .inspect() on Option now

Cargo.lock

@@ -134,7 +134,6 @@ dependencies = [
  "id_tree",
  "inflections",
  "itertools 0.13.0",
- "lazy_static",
  "nom",
  "num_cpus",
  "num_enum",
@@ -249,7 +248,6 @@ dependencies = [
  "camino",
  "inflections",
  "itertools 0.13.0",
- "once_cell",
  "prost-reflect",
  "prost-types",
  "regex",
@@ -1891,7 +1889,6 @@ dependencies = [
  "clap",
  "fluent-syntax",
  "itertools 0.13.0",
- "lazy_static",
  "regex",
  "serde_json",
  "snafu",
@@ -3167,7 +3164,6 @@ dependencies = [
  "anki",
  "futures",
  "itertools 0.13.0",
- "lazy_static",
  "linkcheck",
  "regex",
  "reqwest 0.12.7",
@@ -3445,7 +3441,6 @@ dependencies = [
  "anki_process",
  "anyhow",
  "camino",
- "once_cell",
  "walkdir",
  "which",
 ]
@@ -3609,7 +3604,6 @@ dependencies = [
  "dunce",
  "globset",
  "itertools 0.13.0",
- "lazy_static",
  "maplit",
  "num_cpus",
  "walkdir",

Cargo.toml

@@ -3,7 +3,7 @@ version = "0.0.0"
 authors = ["Ankitects Pty Ltd and contributors <https://help.ankiweb.net>"]
 edition = "2021"
 license = "AGPL-3.0-or-later"
-rust-version = "1.65"
+rust-version = "1.80"
 
 [workspace]
 members = [

build/ninja_gen/Cargo.toml

@@ -14,7 +14,6 @@ camino.workspace = true
 dunce.workspace = true
 globset.workspace = true
 itertools.workspace = true
-lazy_static.workspace = true
 maplit.workspace = true
 num_cpus.workspace = true
 walkdir.workspace = true

build/ninja_gen/src/input.rs

@@ -3,6 +3,7 @@
 
 use std::collections::HashMap;
 use std::fmt::Display;
+use std::sync::LazyLock;
 
 use camino::Utf8PathBuf;
 
@@ -118,9 +119,7 @@ pub struct Glob {
     pub exclude: Option<String>,
 }
 
-lazy_static::lazy_static! {
-    static ref CACHED_FILES: Vec<Utf8PathBuf> = cache_files();
-}
+static CACHED_FILES: LazyLock<Vec<Utf8PathBuf>> = LazyLock::new(cache_files);
 
 /// Walking the source tree once instead of for each glob yields ~4x speed
 /// improvements.

ftl/Cargo.toml

@@ -16,7 +16,6 @@ camino.workspace = true
 clap.workspace = true
 fluent-syntax.workspace = true
 itertools.workspace = true
-lazy_static.workspace = true
 regex.workspace = true
 serde_json.workspace = true
 snafu.workspace = true

ftl/src/garbage_collection.rs

@@ -6,6 +6,7 @@ use std::fs;
 use std::io::BufReader;
 use std::iter::FromIterator;
 use std::path::PathBuf;
+use std::sync::LazyLock;
 
 use anki_io::create_file;
 use anyhow::Context;
@@ -14,7 +15,6 @@ use clap::Args;
 use fluent_syntax::ast;
 use fluent_syntax::ast::Resource;
 use fluent_syntax::parser;
-use lazy_static::lazy_static;
 use regex::Regex;
 use walkdir::DirEntry;
 use walkdir::WalkDir;
@@ -144,9 +144,8 @@ fn extract_nested_messages_and_terms(
     ftl_roots: &[impl AsRef<str>],
     used_ftls: &mut HashSet<String>,
 ) {
-    lazy_static! {
-        static ref REFERENCE: Regex = Regex::new(r"\{\s*-?([-0-9a-z]+)\s*\}").unwrap();
-    }
+    static REFERENCE: LazyLock<Regex> =
+        LazyLock::new(|| Regex::new(r"\{\s*-?([-0-9a-z]+)\s*\}").unwrap());
     for_files_with_ending(ftl_roots, ".ftl", |entry| {
         let source = fs::read_to_string(entry.path()).expect("file not readable");
         for caps in REFERENCE.captures_iter(&source) {
@@ -198,11 +197,12 @@ fn entry_use_check(used_ftls: &HashSet<String>) -> impl Fn(&ast::Entry<&str>) ->
 }
 
 fn extract_references_from_file(refs: &mut HashSet<String>, entry: &DirEntry) {
-    lazy_static! {
-        static ref SNAKECASE_TR: Regex = Regex::new(r"\Wtr\s*\.([0-9a-z_]+)\W").unwrap();
-        static ref CAMELCASE_TR: Regex = Regex::new(r"\Wtr2?\.([0-9A-Za-z_]+)\W").unwrap();
-        static ref DESIGNER_STYLE_TR: Regex = Regex::new(r"<string>([0-9a-z_]+)</string>").unwrap();
-    }
+    static SNAKECASE_TR: LazyLock<Regex> =
+        LazyLock::new(|| Regex::new(r"\Wtr\s*\.([0-9a-z_]+)\W").unwrap());
+    static CAMELCASE_TR: LazyLock<Regex> =
+        LazyLock::new(|| Regex::new(r"\Wtr2?\.([0-9A-Za-z_]+)\W").unwrap());
+    static DESIGNER_STYLE_TR: LazyLock<Regex> =
+        LazyLock::new(|| Regex::new(r"<string>([0-9a-z_]+)</string>").unwrap());
 
     let file_name = entry.file_name().to_str().expect("non-unicode filename");
 

rslib/Cargo.toml

@@ -69,7 +69,6 @@ htmlescape.workspace = true
 hyper.workspace = true
 id_tree.workspace = true
 itertools.workspace = true
-lazy_static.workspace = true
 nom.workspace = true
 num_cpus.workspace = true
 num_enum.workspace = true

rslib/linkchecker/Cargo.toml

@@ -11,7 +11,6 @@ rust-version.workspace = true
 anki.workspace = true
 futures.workspace = true
 itertools.workspace = true
-lazy_static.workspace = true
 linkcheck.workspace = true
 regex.workspace = true
 reqwest.workspace = true

rslib/linkchecker/tests/links.rs

@@ -6,6 +6,7 @@
 use std::borrow::Cow;
 use std::env;
 use std::iter;
+use std::sync::LazyLock;
 use std::time::Duration;
 
 use anki::links::help_page_link_suffix;
@@ -13,7 +14,6 @@ use anki::links::help_page_to_link;
 use anki::links::HelpPage;
 use futures::StreamExt;
 use itertools::Itertools;
-use lazy_static::lazy_static;
 use linkcheck::validation::check_web;
 use linkcheck::validation::Context;
 use linkcheck::validation::Reason;
@@ -70,9 +70,8 @@ impl From<&'static str> for CheckableUrl {
 }
 
 fn ts_help_pages() -> impl Iterator<Item = &'static str> {
-    lazy_static! {
-        static ref QUOTED_URL: Regex = Regex::new("\"(http.+)\"").unwrap();
-    }
+    static QUOTED_URL: LazyLock<Regex> = LazyLock::new(|| Regex::new("\"(http.+)\"").unwrap());
+
     QUOTED_URL
         .captures_iter(include_str!("../../../ts/lib/tslib/help-page.ts"))
         .map(|caps| caps.get(1).unwrap().as_str())

rslib/proto_gen/Cargo.toml

@@ -15,7 +15,6 @@ anyhow.workspace = true
 camino.workspace = true
 inflections.workspace = true
 itertools.workspace = true
-once_cell.workspace = true
 prost-reflect.workspace = true
 prost-types.workspace = true
 regex.workspace = true

rslib/proto_gen/src/lib.rs

@@ -7,6 +7,7 @@
 use std::collections::HashMap;
 use std::env;
 use std::path::PathBuf;
+use std::sync::LazyLock;
 
 use anki_io::read_to_string;
 use anki_io::write_file_if_changed;
@@ -16,7 +17,6 @@ use camino::Utf8Path;
 use inflections::Inflect;
 use itertools::Either;
 use itertools::Itertools;
-use once_cell::sync::Lazy;
 use prost_reflect::DescriptorPool;
 use prost_reflect::MessageDescriptor;
 use prost_reflect::MethodDescriptor;
@@ -238,8 +238,8 @@ pub fn add_must_use_annotations_to_file<E>(path: &Utf8Path, is_empty: E) -> Resu
 where
     E: Fn(&Utf8Path, &str) -> bool,
 {
-    static MESSAGE_OR_ENUM_RE: Lazy<Regex> =
-        Lazy::new(|| Regex::new(r"pub (struct|enum) ([[:alnum:]]+?)\s").unwrap());
+    static MESSAGE_OR_ENUM_RE: LazyLock<Regex> =
+        LazyLock::new(|| Regex::new(r"pub (struct|enum) ([[:alnum:]]+?)\s").unwrap());
     let contents = read_to_string(path)?;
     let contents = MESSAGE_OR_ENUM_RE.replace_all(&contents, |caps: &Captures| {
         let is_enum = caps.get(1).unwrap().as_str() == "enum";

rslib/src/ankidroid/db.rs

@@ -5,6 +5,7 @@ use std::collections::HashMap;
 use std::mem::size_of;
 use std::sync::atomic::AtomicI32;
 use std::sync::atomic::Ordering;
+use std::sync::LazyLock;
 use std::sync::Mutex;
 
 use anki_proto::ankidroid::sql_value::Data;
@@ -16,7 +17,6 @@ use itertools::FoldWhile;
 use itertools::FoldWhile::Continue;
 use itertools::FoldWhile::Done;
 use itertools::Itertools;
-use lazy_static::lazy_static;
 use rusqlite::ToSql;
 use serde::Deserialize;
 
@@ -110,10 +110,8 @@ fn select_slice_of_size<'a>(
 
 type SequenceNumber = i32;
 
-lazy_static! {
-    static ref HASHMAP: Mutex<HashMap<CollectionId, HashMap<SequenceNumber, DbResponse>>> =
-        Mutex::new(HashMap::new());
-}
+static HASHMAP: LazyLock<Mutex<HashMap<CollectionId, HashMap<SequenceNumber, DbResponse>>>> =
+    LazyLock::new(|| Mutex::new(HashMap::new()));
 
 pub(crate) fn flush_single_result(col: &Collection, sequence_number: i32) {
     HASHMAP
@@ -244,10 +242,9 @@ pub(crate) fn next_sequence_number() -> i32 {
     SEQUENCE_NUMBER.fetch_add(1, Ordering::SeqCst)
 }
 
-lazy_static! {
-    // same as we get from io.requery.android.database.CursorWindow.sCursorWindowSize
-    static ref DB_COMMAND_PAGE_SIZE: Mutex<usize> = Mutex::new(1024 * 1024 * 2);
-}
+// same as we get from
+// io.requery.android.database.CursorWindow.sCursorWindowSize
+static DB_COMMAND_PAGE_SIZE: LazyLock<Mutex<usize>> = LazyLock::new(|| Mutex::new(1024 * 1024 * 2));
 
 pub(crate) fn set_max_page_size(size: usize) {
     let mut state = DB_COMMAND_PAGE_SIZE.lock().expect("Could not lock mutex");

rslib/src/ankihub/login.rs

@@ -1,7 +1,8 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
-use lazy_static::lazy_static;
+use std::sync::LazyLock;
+
 use regex::Regex;
 use reqwest::Client;
 use serde;
@@ -31,11 +32,9 @@ pub async fn ankihub_login<S: Into<String>>(
     client: Client,
 ) -> Result<LoginResponse> {
     let client = HttpAnkiHubClient::new("", client);
-    lazy_static! {
-        static ref EMAIL_RE: Regex =
-            Regex::new(r"^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$")
-                .unwrap();
-    }
+    static EMAIL_RE: LazyLock<Regex> = LazyLock::new(|| {
+        Regex::new(r"^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$").unwrap()
+    });
     let mut request = LoginRequest {
         username: None,
         email: None,

rslib/src/backend/mod.rs

@@ -19,10 +19,10 @@ use std::ops::Deref;
 use std::result;
 use std::sync::Arc;
 use std::sync::Mutex;
+use std::sync::OnceLock;
 use std::thread::JoinHandle;
 
 use futures::future::AbortHandle;
-use once_cell::sync::OnceCell;
 use prost::Message;
 use reqwest::Client;
 use tokio::runtime;
@@ -53,7 +53,7 @@ pub struct BackendInner {
     server: bool,
     sync_abort: Mutex<Option<AbortHandle>>,
     progress_state: Arc<Mutex<ProgressState>>,
-    runtime: OnceCell<Runtime>,
+    runtime: OnceLock<Runtime>,
     state: Mutex<BackendState>,
     backup_task: Mutex<Option<JoinHandle<Result<()>>>>,
     media_sync_task: Mutex<Option<JoinHandle<Result<()>>>>,
@@ -88,7 +88,7 @@ impl Backend {
                 want_abort: false,
                 last_progress: None,
             })),
-            runtime: OnceCell::new(),
+            runtime: OnceLock::new(),
             state: Mutex::new(BackendState::default()),
             backup_task: Mutex::new(None),
             media_sync_task: Mutex::new(None),

rslib/src/cloze.rs

@@ -5,11 +5,11 @@ use std::borrow::Cow;
 use std::collections::HashMap;
 use std::collections::HashSet;
 use std::fmt::Write;
+use std::sync::LazyLock;
 
 use anki_proto::image_occlusion::get_image_occlusion_note_response::ImageOcclusion;
 use anki_proto::image_occlusion::get_image_occlusion_note_response::ImageOcclusionShape;
 use htmlescape::encode_attribute;
-use lazy_static::lazy_static;
 use nom::branch::alt;
 use nom::bytes::complete::tag;
 use nom::bytes::complete::take_while;
@@ -24,16 +24,16 @@ use crate::latex::contains_latex;
 use crate::template::RenderContext;
 use crate::text::strip_html_preserving_entities;
 
-lazy_static! {
-    static ref MATHJAX: Regex = Regex::new(
+static MATHJAX: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r"(?xsi)
             (\\[(\[])       # 1 = mathjax opening tag
             (.*?)           # 2 = inner content
             (\\[])])        # 3 = mathjax closing tag
-           "
+           ",
     )
-    .unwrap();
-}
+    .unwrap()
+});
 
 mod mathjax_caps {
     pub const OPENING_TAG: usize = 1;

rslib/src/import_export/text/csv/export.rs

@@ -6,10 +6,10 @@ use std::collections::HashMap;
 use std::fs::File;
 use std::io::Write;
 use std::sync::Arc;
+use std::sync::LazyLock;
 
 use anki_proto::import_export::ExportNoteCsvRequest;
 use itertools::Itertools;
-use lazy_static::lazy_static;
 use regex::Regex;
 
 use super::metadata::Delimiter;
@@ -156,23 +156,22 @@ fn field_to_record_field(field: &str, with_html: bool) -> Cow<str> {
 }
 
 fn strip_redundant_sections(text: &str) -> Cow<str> {
-    lazy_static! {
-        static ref RE: Regex = Regex::new(
+    static RE: LazyLock<Regex> = LazyLock::new(|| {
+        Regex::new(
             r"(?isx)
             <style>.*?</style>          # style elements
             |
             \[\[type:[^]]+\]\]          # type replacements
-            "
+            ",
         )
-        .unwrap();
-    }
+        .unwrap()
+    });
     RE.replace_all(text.as_ref(), "")
 }
 
 fn strip_answer_side_question(text: &str) -> Cow<str> {
-    lazy_static! {
-        static ref RE: Regex = Regex::new(r"(?is)^.*<hr id=answer>\n*").unwrap();
-    }
+    static RE: LazyLock<Regex> =
+        LazyLock::new(|| Regex::new(r"(?is)^.*<hr id=answer>\n*").unwrap());
     RE.replace_all(text.as_ref(), "")
 }
 

rslib/src/latex.rs

@@ -2,8 +2,8 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 use std::borrow::Cow;
+use std::sync::LazyLock;
 
-use lazy_static::lazy_static;
 use regex::Captures;
 use regex::Regex;
 
@@ -11,26 +11,28 @@ use crate::cloze::expand_clozes_to_reveal_latex;
 use crate::media::files::sha1_of_data;
 use crate::text::strip_html;
 
-lazy_static! {
-    pub(crate) static ref LATEX: Regex = Regex::new(
+pub(crate) static LATEX: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r"(?xsi)
             \[latex\](.+?)\[/latex\]     # 1 - standard latex
             |
             \[\$\](.+?)\[/\$\]           # 2 - inline math
             |
             \[\$\$\](.+?)\[/\$\$\]       # 3 - math environment
-            "
+            ",
     )
-    .unwrap();
-    static ref LATEX_NEWLINES: Regex = Regex::new(
+    .unwrap()
+});
+static LATEX_NEWLINES: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r#"(?xi)
             <br( /)?>
             |
             <div>
-        "#
+        "#,
     )
-    .unwrap();
-}
+    .unwrap()
+});
 
 pub(crate) fn contains_latex(text: &str) -> bool {
     LATEX.is_match(text)

rslib/src/lib.rs

@@ -52,9 +52,7 @@ pub mod undo;
 pub mod version;
 
 use std::env;
+use std::sync::LazyLock;
 
-use lazy_static::lazy_static;
-
-lazy_static! {
-    pub(crate) static ref PYTHON_UNIT_TESTS: bool = env::var("ANKI_TEST_MODE").is_ok();
-}
+pub(crate) static PYTHON_UNIT_TESTS: LazyLock<bool> =
+    LazyLock::new(|| env::var("ANKI_TEST_MODE").is_ok());

rslib/src/media/check.rs

@@ -6,11 +6,11 @@ use std::collections::HashMap;
 use std::collections::HashSet;
 use std::fs;
 use std::io;
+use std::sync::LazyLock;
 
 use anki_i18n::without_unicode_isolation;
 use anki_io::write_file;
 use data_encoding::BASE64;
-use once_cell::sync::Lazy;
 use regex::Regex;
 use tracing::debug;
 use tracing::info;
@@ -459,7 +459,7 @@ impl MediaChecker<'_> {
     }
 
     fn maybe_extract_inline_image<'a>(&mut self, fname_decoded: &'a str) -> Result<Cow<'a, str>> {
-        static BASE64_IMG: Lazy<Regex> = Lazy::new(|| {
+        static BASE64_IMG: LazyLock<Regex> = LazyLock::new(|| {
             Regex::new("(?i)^data:image/(jpg|jpeg|png|gif|webp|avif);base64,(.+)$").unwrap()
         });
 

rslib/src/media/files.rs

@@ -7,6 +7,7 @@ use std::io;
 use std::io::Read;
 use std::path::Path;
 use std::path::PathBuf;
+use std::sync::LazyLock;
 use std::time;
 
 use anki_io::create_dir;
@@ -15,7 +16,6 @@ use anki_io::write_file;
 use anki_io::FileIoError;
 use anki_io::FileIoSnafu;
 use anki_io::FileOp;
-use lazy_static::lazy_static;
 use regex::Regex;
 use sha1::Digest;
 use sha1::Sha1;
@@ -27,8 +27,8 @@ use unicode_normalization::UnicodeNormalization;
 use crate::prelude::*;
 use crate::sync::media::MAX_MEDIA_FILENAME_LENGTH;
 
-lazy_static! {
-    static ref WINDOWS_DEVICE_NAME: Regex = Regex::new(
+static WINDOWS_DEVICE_NAME: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r"(?xi)
             # starting with one of the following names
             ^
@@ -39,30 +39,34 @@ lazy_static! {
             (
                 \. | $
             )
-        "
+        ",
     )
-    .unwrap();
-    static ref WINDOWS_TRAILING_CHAR: Regex = Regex::new(
+    .unwrap()
+});
+static WINDOWS_TRAILING_CHAR: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r"(?x)
             # filenames can't end with a space or period
             (
                 \x20 | \.
             )    
             $
-            "
+            ",
     )
-    .unwrap();
-    pub(crate) static ref NONSYNCABLE_FILENAME: Regex = Regex::new(
+    .unwrap()
+});
+pub(crate) static NONSYNCABLE_FILENAME: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r#"(?xi)
             ^
             (:?
                 thumbs.db | .ds_store
             )
             $
-            "#
+            "#,
     )
-    .unwrap();
-}
+    .unwrap()
+});
 
 /// True if character may cause problems on one or more platforms.
 fn disallowed_char(char: char) -> bool {

rslib/src/notetype/checks.rs

@@ -4,9 +4,9 @@
 use std::borrow::Cow;
 use std::fmt::Write;
 use std::ops::Deref;
+use std::sync::LazyLock;
 
 use anki_i18n::without_unicode_isolation;
-use lazy_static::lazy_static;
 use regex::Captures;
 use regex::Match;
 use regex::Regex;
@@ -24,9 +24,7 @@ struct Template<'a> {
     front: bool,
 }
 
-lazy_static! {
-    static ref FIELD_REPLACEMENT: Regex = Regex::new(r"\{\{.+\}\}").unwrap();
-}
+static FIELD_REPLACEMENT: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"\{\{.+\}\}").unwrap());
 
 impl Collection {
     pub fn report_media_field_referencing_templates(&mut self, buf: &mut String) -> Result<()> {

rslib/src/notetype/mod.rs

@@ -20,6 +20,7 @@ use std::collections::HashMap;
 use std::collections::HashSet;
 use std::iter::FromIterator;
 use std::sync::Arc;
+use std::sync::LazyLock;
 
 pub use anki_proto::notetypes::notetype::config::card_requirement::Kind as CardRequirementKind;
 pub use anki_proto::notetypes::notetype::config::CardRequirement;
@@ -33,7 +34,6 @@ pub use anki_proto::notetypes::Notetype as NotetypeProto;
 pub(crate) use cardgen::AlreadyGeneratedCardInfo;
 pub(crate) use cardgen::CardGenContext;
 pub use fields::NoteField;
-use lazy_static::lazy_static;
 pub use notetypechange::ChangeNotetypeInput;
 pub use notetypechange::NotetypeChangeInfo;
 use regex::Regex;
@@ -67,9 +67,9 @@ pub(crate) const DEFAULT_CSS: &str = include_str!("styling.css");
 pub(crate) const DEFAULT_CLOZE_CSS: &str = include_str!("cloze_styling.css");
 pub(crate) const DEFAULT_LATEX_HEADER: &str = include_str!("header.tex");
 pub(crate) const DEFAULT_LATEX_FOOTER: &str = r"\end{document}";
-lazy_static! {
 /// New entries must be handled in render.rs/add_special_fields().
-    static ref SPECIAL_FIELDS: HashSet<&'static str> = HashSet::from_iter(vec![
+static SPECIAL_FIELDS: LazyLock<HashSet<&'static str>> = LazyLock::new(|| {
+    HashSet::from_iter(vec![
         "FrontSide",
         "Card",
         "CardFlag",
@@ -77,8 +77,8 @@ lazy_static! {
         "Subdeck",
         "Tags",
         "Type",
-    ]);
-}
+    ])
+});
 
 #[derive(Debug, PartialEq, Clone)]
 pub struct Notetype {
@@ -365,9 +365,8 @@ impl Notetype {
     }
 
     fn ensure_template_fronts_unique(&self) -> Result<(), CardTypeError> {
-        lazy_static! {
-            static ref CARD_TAG: Regex = Regex::new(r"\{\{\s*Card\s*\}\}").unwrap();
-        }
+        static CARD_TAG: LazyLock<Regex> =
+            LazyLock::new(|| Regex::new(r"\{\{\s*Card\s*\}\}").unwrap());
 
         let mut map = HashMap::new();
         for (index, card) in self.templates.iter().enumerate() {

rslib/src/scheduler/queue/learning.rs

@@ -118,12 +118,11 @@ impl CardQueues {
 
     /// Remove the head of the intraday learning queue, and update counts.
     pub(super) fn pop_intraday_learning(&mut self) -> Option<LearningQueueEntry> {
-        self.intraday_learning.pop_front().map(|head| {
+        self.intraday_learning.pop_front().inspect(|_head| {
             // FIXME:
             // under normal circumstances this should not go below 0, but currently
             // the Python unit tests answer learning cards before they're due
             self.counts.learning = self.counts.learning.saturating_sub(1);
-            head
         })
     }
 

rslib/src/scheduler/queue/main.rs

@@ -21,7 +21,7 @@ pub(crate) enum MainQueueEntryKind {
 impl CardQueues {
     /// Remove the head of the main queue, and update counts.
     pub(super) fn pop_main(&mut self) -> Option<MainQueueEntry> {
-        self.main.pop_front().map(|head| {
+        self.main.pop_front().inspect(|head| {
             match head.kind {
                 MainQueueEntryKind::New => self.counts.new -= 1,
                 MainQueueEntryKind::Review => self.counts.review -= 1,
@@ -32,7 +32,6 @@ impl CardQueues {
                     self.counts.learning = self.counts.learning.saturating_sub(1)
                 }
             };
-            head
         })
     }
 

rslib/src/scheduler/reviews.rs

@@ -2,8 +2,8 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 use std::collections::HashMap;
+use std::sync::LazyLock;
 
-use lazy_static::lazy_static;
 use rand::distributions::Distribution;
 use rand::distributions::Uniform;
 use regex::Regex;
@@ -65,8 +65,8 @@ pub struct DueDateSpecifier {
 }
 
 pub fn parse_due_date_str(s: &str) -> Result<DueDateSpecifier> {
-    lazy_static! {
-        static ref RE: Regex = Regex::new(
+    static RE: LazyLock<Regex> = LazyLock::new(|| {
+        Regex::new(
             r"(?x)^
             # a number
             (?P<min>\d+)
@@ -78,10 +78,10 @@ pub fn parse_due_date_str(s: &str) -> Result<DueDateSpecifier> {
             # optional exclamation mark
             (?P<bang>!)?
             $
-        "
+        ",
         )
-        .unwrap();
-    }
+        .unwrap()
+    });
     let caps = RE.captures(s).or_invalid(s)?;
     let min: u32 = caps.name("min").unwrap().as_str().parse()?;
     let max = if let Some(max) = caps.name("max") {

rslib/src/search/parser.rs

@@ -1,7 +1,8 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
-use lazy_static::lazy_static;
+use std::sync::LazyLock;
+
 use nom::branch::alt;
 use nom::bytes::complete::escaped;
 use nom::bytes::complete::is_not;
@@ -621,9 +622,7 @@ fn parse_mid(s: &str) -> ParseResult<SearchNode> {
 /// ensure a list of ids contains only numbers and commas, returning unchanged
 /// if true used by nid: and cid:
 fn check_id_list<'a>(s: &'a str, context: &str) -> ParseResult<'a, &'a str> {
-    lazy_static! {
-        static ref RE: Regex = Regex::new(r"^(\d+,)*\d+$").unwrap();
-    }
+    static RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"^(\d+,)*\d+$").unwrap());
     if RE.is_match(s) {
         Ok(s)
     } else {
@@ -700,9 +699,7 @@ fn unescape(txt: &str) -> ParseResult<String> {
         ))
     } else {
         Ok(if is_parser_escape(txt) {
-            lazy_static! {
-                static ref RE: Regex = Regex::new(r#"\\[\\":()-]"#).unwrap();
-            }
+            static RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r#"\\[\\":()-]"#).unwrap());
             RE.replace_all(txt, |caps: &Captures| match &caps[0] {
                 r"\\" => r"\\",
                 "\\\"" => "\"",
@@ -722,17 +719,17 @@ fn unescape(txt: &str) -> ParseResult<String> {
 /// Return invalid escape sequence if any.
 fn invalid_escape_sequence(txt: &str) -> Option<String> {
     // odd number of \s not followed by an escapable character
-    lazy_static! {
-        static ref RE: Regex = Regex::new(
+    static RE: LazyLock<Regex> = LazyLock::new(|| {
+        Regex::new(
             r#"(?x)
             (?:^|[^\\])         # not a backslash
             (?:\\\\)*           # even number of backslashes
             (\\                 # single backslash
             (?:[^\\":*_()-]|$)) # anything but an escapable char
-            "#
+            "#,
         )
-        .unwrap();
-    }
+        .unwrap()
+    });
     let caps = RE.captures(txt)?;
 
     Some(caps[1].to_string())
@@ -741,17 +738,17 @@ fn invalid_escape_sequence(txt: &str) -> Option<String> {
 /// Check string for escape sequences handled by the parser: ":()-
 fn is_parser_escape(txt: &str) -> bool {
     // odd number of \s followed by a char with special meaning to the parser
-    lazy_static! {
-        static ref RE: Regex = Regex::new(
+    static RE: LazyLock<Regex> = LazyLock::new(|| {
+        Regex::new(
             r#"(?x)
             (?:^|[^\\])     # not a backslash
             (?:\\\\)*       # even number of backslashes
             \\              # single backslash
             [":()-]         # parser escape
-            "#
+            "#,
         )
-        .unwrap();
-    }
+        .unwrap()
+    });
 
     RE.is_match(txt)
 }

rslib/src/search/writer.rs

@@ -2,8 +2,8 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 use std::mem;
+use std::sync::LazyLock;
 
-use lazy_static::lazy_static;
 use regex::Regex;
 
 use crate::notetype::NotetypeId as NotetypeIdType;
@@ -109,9 +109,8 @@ fn maybe_quote(txt: &str) -> String {
 /// Checks for the reserved keywords "and" and "or", a prepended hyphen,
 /// whitespace and brackets.
 fn needs_quotation(txt: &str) -> bool {
-    lazy_static! {
-        static ref RE: Regex = Regex::new("(?i)^and$|^or$|^-.| |\u{3000}|\\(|\\)").unwrap();
-    }
+    static RE: LazyLock<Regex> =
+        LazyLock::new(|| Regex::new("(?i)^and$|^or$|^-.| |\u{3000}|\\(|\\)").unwrap());
     RE.is_match(txt)
 }
 

rslib/src/storage/deck/mod.rs

@@ -161,10 +161,9 @@ impl SqliteStorage {
             .prepare(include_str!("alloc_id.sql"))?
             .query_row([TimestampMillis::now()], |r| r.get(0))?;
         self.add_or_update_deck_with_existing_id(deck)
-            .map_err(|err| {
+            .inspect_err(|_err| {
                 // restore id of 0
                 deck.id.0 = 0;
-                err
             })
     }
 

rslib/src/sync/collection/tests.rs

@@ -4,9 +4,9 @@
 #![cfg(test)]
 
 use std::future::Future;
+use std::sync::LazyLock;
 
 use axum::http::StatusCode;
-use once_cell::sync::Lazy;
 use reqwest::Client;
 use reqwest::Url;
 use serde_json::json;
@@ -57,7 +57,7 @@ struct TestAuth {
     host_key: String,
 }
 
-static AUTH: Lazy<TestAuth> = Lazy::new(|| {
+static AUTH: LazyLock<TestAuth> = LazyLock::new(|| {
     if let Ok(auth) = std::env::var("TEST_AUTH") {
         let mut auth = auth.split(':');
         TestAuth {
@@ -93,7 +93,7 @@ where
     .unwrap();
     tokio::spawn(server_fut.instrument(Span::current()));
     // when not using ephemeral servers, tests need to be serialized
-    static LOCK: Lazy<Mutex<()>> = Lazy::new(|| Mutex::new(()));
+    static LOCK: LazyLock<Mutex<()>> = LazyLock::new(|| Mutex::new(()));
     let _lock: MutexGuard<()>;
     // setup client to connect to it
     let endpoint = if let Ok(endpoint) = std::env::var("TEST_ENDPOINT") {

rslib/src/sync/http_server/user.rs

@@ -57,10 +57,9 @@ impl User {
         // Returning HTTP 400 will inform the client that a DB check+full sync
         // is required to fix the issue.
         op(col, state)
-            .map_err(|e| {
+            .inspect_err(|_e| {
                 self.col = None;
                 self.sync_state = None;
-                e
             })
             .or_bad_request("op failed in sync_state")
     }

rslib/src/sync/media/database/server/meta/mod.rs

@@ -77,9 +77,8 @@ impl ServerMediaDatabase {
                 self.db.execute("commit", [])?;
                 Ok(meta.last_usn)
             })
-            .map_err(|e| {
+            .inspect_err(|_e| {
                 let _ = self.db.execute("rollback", []);
-                e
             })
     }
 

rslib/src/sync/request/mod.rs

@@ -8,6 +8,7 @@ use std::any::Any;
 use std::env;
 use std::marker::PhantomData;
 use std::net::IpAddr;
+use std::sync::LazyLock;
 
 use async_trait::async_trait;
 use axum::body::Body;
@@ -19,7 +20,6 @@ use axum::RequestPartsExt;
 use axum_client_ip::SecureClientIp;
 use axum_extra::TypedHeader;
 use header_and_stream::SyncHeader;
-use once_cell::sync::Lazy;
 use serde::de::DeserializeOwned;
 use serde::Serialize;
 use serde_json::Error;
@@ -179,7 +179,7 @@ where
     }
 }
 
-pub static MAXIMUM_SYNC_PAYLOAD_BYTES: Lazy<usize> = Lazy::new(|| {
+pub static MAXIMUM_SYNC_PAYLOAD_BYTES: LazyLock<usize> = LazyLock::new(|| {
     env::var("MAX_SYNC_PAYLOAD_MEGS")
         .map(|v| v.parse().expect("invalid upload limit"))
         .unwrap_or(100)
@@ -189,5 +189,5 @@ pub static MAXIMUM_SYNC_PAYLOAD_BYTES: Lazy<usize> = Lazy::new(|| {
 /// Client ignores this when a non-AnkiWeb endpoint is configured. Controls the
 /// maximum size of a payload after decompression, which effectively limits the
 /// how large a collection file can be uploaded.
-pub static MAXIMUM_SYNC_PAYLOAD_BYTES_UNCOMPRESSED: Lazy<u64> =
-    Lazy::new(|| (*MAXIMUM_SYNC_PAYLOAD_BYTES * 3) as u64);
+pub static MAXIMUM_SYNC_PAYLOAD_BYTES_UNCOMPRESSED: LazyLock<u64> =
+    LazyLock::new(|| (*MAXIMUM_SYNC_PAYLOAD_BYTES * 3) as u64);

rslib/src/template.rs

@@ -6,9 +6,9 @@ use std::collections::HashMap;
 use std::collections::HashSet;
 use std::fmt::Write;
 use std::iter;
+use std::sync::LazyLock;
 
 use anki_i18n::I18n;
-use lazy_static::lazy_static;
 use nom::branch::alt;
 use nom::bytes::complete::tag;
 use nom::bytes::complete::take_until;
@@ -546,18 +546,18 @@ fn append_str_to_nodes(nodes: &mut Vec<RenderedNode>, text: &str) {
 
 /// True if provided text contains only whitespace and/or empty BR/DIV tags.
 pub(crate) fn field_is_empty(text: &str) -> bool {
-    lazy_static! {
-        static ref RE: Regex = Regex::new(
+    static RE: LazyLock<Regex> = LazyLock::new(|| {
+        Regex::new(
             r"(?xsi)
             ^(?:
             [[:space:]]
             |
             </?(?:br|div)\ ?/?>
             )*$
-        "
+        ",
         )
-        .unwrap();
-    }
+        .unwrap()
+    });
     RE.is_match(text)
 }
 

rslib/src/template_filters.rs

@@ -2,9 +2,9 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 use std::borrow::Cow;
+use std::sync::LazyLock;
 
 use blake3::Hasher;
-use lazy_static::lazy_static;
 use regex::Captures;
 use regex::Regex;
 
@@ -110,9 +110,7 @@ fn apply_filter(
 // Ruby filters
 //----------------------------------------
 
-lazy_static! {
-    static ref FURIGANA: Regex = Regex::new(r" ?([^ >]+?)\[(.+?)\]").unwrap();
-}
+static FURIGANA: LazyLock<Regex> = LazyLock::new(|| Regex::new(r" ?([^ >]+?)\[(.+?)\]").unwrap());
 
 /// Did furigana regex match a sound tag?
 fn captured_sound(caps: &Captures) -> bool {

rslib/src/text.rs

@@ -2,8 +2,8 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 use std::borrow::Cow;
+use std::sync::LazyLock;
 
-use lazy_static::lazy_static;
 use percent_encoding_iri::percent_decode_str;
 use percent_encoding_iri::utf8_percent_encode;
 use percent_encoding_iri::AsciiSet;
@@ -79,17 +79,18 @@ pub enum AvTag {
     },
 }
 
-lazy_static! {
-    static ref HTML: Regex = Regex::new(concat!(
+static HTML: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(concat!(
         "(?si)",
         // wrapped text
         r"(<!--.*?-->)|(<style.*?>.*?</style>)|(<script.*?>.*?</script>)",
         // html tags
         r"|(<.*?>)",
     ))
-    .unwrap();
-
-    static ref HTML_LINEBREAK_TAGS: Regex = Regex::new(
+    .unwrap()
+});
+static HTML_LINEBREAK_TAGS: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r#"(?xsi)
             </?
             (?:
@@ -99,10 +100,13 @@ lazy_static! {
                 |output|p|pre|section|table|tfoot|ul|video
             )
             >
-        "#
-    ).unwrap();
+        "#,
+    )
+    .unwrap()
+});
 
-    pub static ref HTML_MEDIA_TAGS: Regex = Regex::new(
+pub static HTML_MEDIA_TAGS: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r#"(?xsi)
             # the start of the image, audio, or object tag
             <\b(?:img|audio|video|object)\b
@@ -141,11 +145,14 @@ lazy_static! {
                         >
                     )
             )
-            "#
-    ).unwrap();
+            "#,
+    )
+    .unwrap()
+});
 
 // videos are also in sound tags
-    static ref AV_TAGS: Regex = Regex::new(
+static AV_TAGS: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r"(?xs)
             \[sound:(.+?)\]     # 1 - the filename in a sound tag
             |
@@ -153,15 +160,21 @@ lazy_static! {
                 \[(.*?)\]       # 2 - arguments to tts call
                 (.*?)           # 3 - field text
             \[/anki:tts\]
-            ").unwrap();
+            ",
+    )
+    .unwrap()
+});
 
-    static ref PERSISTENT_HTML_SPACERS: Regex = Regex::new(r"(?i)<br\s*/?>|<div>|\n").unwrap();
+static PERSISTENT_HTML_SPACERS: LazyLock<Regex> =
+    LazyLock::new(|| Regex::new(r"(?i)<br\s*/?>|<div>|\n").unwrap());
 
-    static ref TYPE_TAG: Regex = Regex::new(r"\[\[type:[^]]+\]\]").unwrap();
-    pub(crate) static ref SOUND_TAG: Regex = Regex::new(r"\[sound:([^]]+)\]").unwrap();
+static TYPE_TAG: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"\[\[type:[^]]+\]\]").unwrap());
+pub(crate) static SOUND_TAG: LazyLock<Regex> =
+    LazyLock::new(|| Regex::new(r"\[sound:([^]]+)\]").unwrap());
 
 /// Files included in CSS with a leading underscore.
-    static ref UNDERSCORED_CSS_IMPORTS: Regex = Regex::new(
+static UNDERSCORED_CSS_IMPORTS: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r#"(?xi)
             (?:@import\s+           # import statement with a bare
                 "(_[^"]*.css)"      # double quoted
@@ -176,10 +189,14 @@ lazy_static! {
                 |                   # or
                 (_.+)               # unquoted filename
             \s*\))
-    "#).unwrap();
+    "#,
+    )
+    .unwrap()
+});
 
 /// Strings, src and data attributes with a leading underscore.
-    static ref UNDERSCORED_REFERENCES: Regex = Regex::new(
+static UNDERSCORED_REFERENCES: LazyLock<Regex> = LazyLock::new(|| {
+    Regex::new(
         r#"(?x)
                 \[sound:(_[^]]+)\]  # a filename in an Anki sound tag
             |                       # or
@@ -190,8 +207,10 @@ lazy_static! {
                 \b(?:src|data)      # a 'src' or 'data' attribute
                 =                   # followed by
                 (_[^ >]+)           # an unquoted value
-    "#).unwrap();
-}
+    "#,
+    )
+    .unwrap()
+});
 
 pub fn is_html(text: impl AsRef<str>) -> bool {
     HTML.is_match(text.as_ref())
@@ -446,16 +465,16 @@ pub(crate) fn without_combining(s: &str) -> Cow<str> {
 /// Check if string contains an unescaped wildcard.
 pub(crate) fn is_glob(txt: &str) -> bool {
     // even number of \s followed by a wildcard
-    lazy_static! {
-        static ref RE: Regex = Regex::new(
+    static RE: LazyLock<Regex> = LazyLock::new(|| {
+        Regex::new(
             r"(?x)
             (?:^|[^\\])     # not a backslash
             (?:\\\\)*       # even number of backslashes
             [*_]            # wildcard
-            "
+            ",
         )
-        .unwrap();
-    }
+        .unwrap()
+    });
 
     RE.is_match(txt)
 }
@@ -467,9 +486,7 @@ pub(crate) fn to_re(txt: &str) -> Cow<str> {
 
 /// Convert Anki style to RegEx using the provided wildcard.
 pub(crate) fn to_custom_re<'a>(txt: &'a str, wildcard: &str) -> Cow<'a, str> {
-    lazy_static! {
-        static ref RE: Regex = Regex::new(r"\\?.").unwrap();
-    }
+    static RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"\\?.").unwrap());
     RE.replace_all(txt, |caps: &Captures| {
         let s = &caps[0];
         match s {
@@ -485,9 +502,7 @@ pub(crate) fn to_custom_re<'a>(txt: &'a str, wildcard: &str) -> Cow<'a, str> {
 /// Convert to SQL respecting Anki wildcards.
 pub(crate) fn to_sql(txt: &str) -> Cow<str> {
     // escape sequences and unescaped special characters which need conversion
-    lazy_static! {
-        static ref RE: Regex = Regex::new(r"\\[\\*]|[*%]").unwrap();
-    }
+    static RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"\\[\\*]|[*%]").unwrap());
     RE.replace_all(txt, |caps: &Captures| {
         let s = &caps[0];
         match s {
@@ -502,17 +517,13 @@ pub(crate) fn to_sql(txt: &str) -> Cow<str> {
 
 /// Unescape everything.
 pub(crate) fn to_text(txt: &str) -> Cow<str> {
-    lazy_static! {
-        static ref RE: Regex = Regex::new(r"\\(.)").unwrap();
-    }
+    static RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"\\(.)").unwrap());
     RE.replace_all(txt, "$1")
 }
 
 /// Escape Anki wildcards and the backslash for escaping them: \*_
 pub(crate) fn escape_anki_wildcards(txt: &str) -> String {
-    lazy_static! {
-        static ref RE: Regex = Regex::new(r"[\\*_]").unwrap();
-    }
+    static RE: LazyLock<Regex> = LazyLock::new(|| Regex::new(r"[\\*_]").unwrap());
     RE.replace_all(txt, r"\$0").into()
 }
 
@@ -545,9 +556,8 @@ pub(crate) fn glob_matcher(search: &str) -> impl Fn(&str) -> bool + '_ {
     }
 }
 
-lazy_static! {
-    pub(crate) static ref REMOTE_FILENAME: Regex = Regex::new("(?i)^https?://").unwrap();
-}
+pub(crate) static REMOTE_FILENAME: LazyLock<Regex> =
+    LazyLock::new(|| Regex::new("(?i)^https?://").unwrap());
 
 /// https://url.spec.whatwg.org/#fragment-percent-encode-set
 const FRAGMENT_QUERY_UNION: &AsciiSet = &CONTROLS

rslib/src/typeanswer.rs

@@ -2,9 +2,9 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 use std::borrow::Cow;
+use std::sync::LazyLock;
 
 use difflib::sequencematcher::SequenceMatcher;
-use once_cell::sync::Lazy;
 use regex::Regex;
 use unic_ucd_category::GeneralCategory;
 
@@ -12,7 +12,7 @@ use crate::card_rendering::strip_av_tags;
 use crate::text::normalize_to_nfkd;
 use crate::text::strip_html;
 
-static LINEBREAKS: Lazy<Regex> = Lazy::new(|| {
+static LINEBREAKS: LazyLock<Regex> = LazyLock::new(|| {
     Regex::new(
         r"(?six)
         (

rslib/src/version.rs

@@ -2,8 +2,7 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 use std::env;
-
-use lazy_static::lazy_static;
+use std::sync::LazyLock;
 
 pub fn version() -> &'static str {
     include_str!("../../.version").trim()
@@ -14,25 +13,25 @@ pub fn buildhash() -> &'static str {
 }
 
 pub(crate) fn sync_client_version() -> &'static str {
-    lazy_static! {
-        static ref VER: String = format!(
+    static VER: LazyLock<String> = LazyLock::new(|| {
+        format!(
             "anki,{version} ({buildhash}),{platform}",
             version = version(),
             buildhash = buildhash(),
             platform = env::var("PLATFORM").unwrap_or_else(|_| env::consts::OS.to_string())
-        );
-    }
+        )
+    });
     &VER
 }
 
 pub(crate) fn sync_client_version_short() -> &'static str {
-    lazy_static! {
-        static ref VER: String = format!(
+    static VER: LazyLock<String> = LazyLock::new(|| {
+        format!(
             "{version},{buildhash},{platform}",
             version = version(),
             buildhash = buildhash(),
             platform = env::consts::OS
-        );
-    }
+        )
+    });
     &VER
 }

tools/minilints/Cargo.toml

@@ -12,6 +12,5 @@ anki_io.workspace = true
 anki_process.workspace = true
 anyhow.workspace = true
 camino.workspace = true
-once_cell.workspace = true
 walkdir.workspace = true
 which.workspace = true

tools/minilints/src/main.rs

@@ -1,6 +1,7 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
+use std::cell::LazyCell;
 use std::collections::HashSet;
 use std::env;
 use std::fs;
@@ -16,7 +17,6 @@ use anki_process::CommandExt;
 use anyhow::Context;
 use anyhow::Result;
 use camino::Utf8Path;
-use once_cell::unsync::Lazy;
 use walkdir::WalkDir;
 
 const NONSTANDARD_HEADER: &[&str] = &[
@@ -63,7 +63,7 @@ fn main() -> Result<()> {
 
 struct LintContext {
     want_fix: bool,
-    unstaged_changes: Lazy<()>,
+    unstaged_changes: LazyCell<()>,
     found_problems: bool,
     nonstandard_headers: HashSet<&'static Utf8Path>,
 }
@@ -72,7 +72,7 @@ impl LintContext {
     pub fn new(want_fix: bool) -> Self {
         Self {
             want_fix,
-            unstaged_changes: Lazy::new(check_for_unstaged_changes),
+            unstaged_changes: LazyCell::new(check_for_unstaged_changes),
             found_problems: false,
             nonstandard_headers: NONSTANDARD_HEADER.iter().map(Utf8Path::new).collect(),
         }
@@ -113,7 +113,7 @@ impl LintContext {
         let missing = !head.contains("Ankitects Pty Ltd and contributors");
         if missing {
             if self.want_fix {
-                Lazy::force(&self.unstaged_changes);
+                LazyCell::force(&self.unstaged_changes);
                 fix_copyright(path)?;
             } else {
                 println!("missing standard copyright header: {:?}", path);