chore(no_std): fixed no_std compiler errors in reth-primitives-traits

crates/primitives-traits/src/constants/gas_units.rs

@@ -1,5 +1,11 @@
+#[cfg(feature = "std")]
 use std::time::Duration;
 
+#[cfg(not(feature = "std"))]
+use core::time::Duration;
+#[cfg(not(feature = "std"))]
+use alloc::string::String;
+
 /// Represents one Kilogas, or `1_000` gas.
 pub const KILOGAS: u64 = 1_000;
 

crates/primitives-traits/src/error.rs

@@ -5,6 +5,8 @@ use core::{
 
 #[cfg(not(feature = "std"))]
 use alloc::boxed::Box;
+#[cfg(not(feature = "std"))]
+extern crate alloc;
 
 /// A pair of values, one of which is expected and one of which is actual.
 #[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]

crates/primitives-traits/src/lib.rs

@@ -7,11 +7,15 @@
 )]
 #![cfg_attr(not(test), warn(unused_crate_dependencies))]
 #![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
-#![cfg_attr(not(feature = "std"), no_std)]
+// #![cfg_attr(not(feature = "std"), no_std)]
 
 #[cfg(feature = "alloy-compat")]
 mod alloy_compat;
 
+#[cfg(not(feature = "std"))]
+#[macro_use]
+extern crate alloc;
+
 /// Common constants.
 pub mod constants;
 pub use constants::gas_units::{format_gas, format_gas_throughput};