once_cell in std from 1.70 (#14402)

* once_cell now stable

* cargo fmt

---------

Co-authored-by: parity-processbot <>

substrate/frame/support/Cargo.toml

@@ -32,7 +32,6 @@ tt-call = "1.0.8"
 macro_magic = "0.4.1"
 frame-support-procedural = { version = "4.0.0-dev", default-features = false, path = "./procedural" }
 paste = "1.0"
-once_cell = { version = "1", default-features = false, optional = true }
 sp-state-machine = { version = "0.28.0", default-features = false, optional = true, path = "../../primitives/state-machine" }
 bitflags = "1.3"
 impl-trait-for-tuples = "0.2.2"
@@ -53,7 +52,6 @@ default = ["std"]
 std = [
 	"sp-core/std",
 	"k256/std",
-	"once_cell",
 	"serde/std",
 	"sp-api/std",
 	"sp-io/std",

substrate/frame/support/procedural/src/storage/metadata.rs

@@ -114,8 +114,8 @@ fn default_byte_getter(
 
 		#[cfg(feature = "std")]
 		#[allow(non_upper_case_globals)]
-		static #cache_name: #scrate::once_cell::sync::OnceCell<#scrate::sp_std::vec::Vec<u8>> =
-			#scrate::once_cell::sync::OnceCell::new();
+		static #cache_name: ::core::sync::OnceLock<#scrate::sp_std::vec::Vec<u8>> =
+			::core::sync::OnceLock::new();
 
 		#[cfg(feature = "std")]
 		impl<#runtime_generic: #runtime_trait, #optional_instance_bound>

substrate/frame/support/src/lib.rs

@@ -41,9 +41,6 @@ pub use codec;
 pub use frame_metadata as metadata;
 #[doc(hidden)]
 pub use log;
-#[cfg(feature = "std")]
-#[doc(hidden)]
-pub use once_cell;
 #[doc(hidden)]
 pub use paste;
 #[doc(hidden)]