From c37e3e39524189f47a549b39069071b4154f0154 Mon Sep 17 00:00:00 2001
From: frozenlib <frozenlib@users.noreply.github.com>
Date: Fri, 1 Dec 2023 22:48:01 +0900
Subject: [PATCH] Use std::sync::OnceLock in generated code and remove
 once_cell dependency.

---
 parse-display-derive/src/lib.rs | 5 ++---
 parse-display/Cargo.toml        | 3 +--
 parse-display/src/lib.rs        | 1 -
 3 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/parse-display-derive/src/lib.rs b/parse-display-derive/src/lib.rs
index 2dd4e89..4c884a9 100644
--- a/parse-display-derive/src/lib.rs
+++ b/parse-display-derive/src/lib.rs
@@ -562,9 +562,8 @@ impl<'a> ParserBuilder<'a> {
                 let regex = to_regex_string(hirs);
                 quote! {
                     #[allow(clippy::trivial_regex)]
-                    static RE: #crate_path::helpers::once_cell::sync::Lazy<#crate_path::helpers::regex::Regex> =
-                        #crate_path::helpers::once_cell::sync::Lazy::new(|| #crate_path::helpers::regex::Regex::new(#regex).unwrap());
-                    if let Some(c) = RE.captures(&s) {
+                    static RE: ::std::sync::OnceLock<#crate_path::helpers::regex::Regex> = ::std::sync::OnceLock::new();
+                    if let ::core::option::Option::Some(c) = RE.get_or_init(|| #crate_path::helpers::regex::Regex::new(#regex).unwrap()).captures(&s) {
                          #code
                     }
                 }
diff --git a/parse-display/Cargo.toml b/parse-display/Cargo.toml
index 30f9a2a..b9171ca 100644
--- a/parse-display/Cargo.toml
+++ b/parse-display/Cargo.toml
@@ -13,9 +13,8 @@ edition = "2021"
 
 [dependencies]
 parse-display-derive = { version = "=0.8.2", path = "../parse-display-derive" }
-once_cell = { version = "1.17.1", optional = true }
 regex = { version = "1.9.1", optional = true }
 
 [features]
 default = ["std"]
-std = ["regex", "once_cell"]
+std = ["regex"]
diff --git a/parse-display/src/lib.rs b/parse-display/src/lib.rs
index 9d75b47..91d2ea1 100644
--- a/parse-display/src/lib.rs
+++ b/parse-display/src/lib.rs
@@ -705,7 +705,6 @@ mod tests;
 
 #[cfg(feature = "std")]
 pub mod helpers {
-    pub use once_cell;
     pub use regex;
 }