test: fix coverage attr to nightly

Author: 0xNeshi

Cargo.toml

@@ -63,7 +63,7 @@ version = "0.2.0-alpha.1"
 missing_docs = "warn"
 unreachable_pub = "warn"
 rust_2021_compatibility = { level = "warn", priority = -1 }
-unexpected_cfgs = { level = "warn", check-cfg = ['cfg(coverage)'] }
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(coverage_nightly)'] }
 
 [workspace.lints.clippy]
 pedantic = "warn"

contracts/src/lib.rs

@@ -46,7 +46,7 @@ impl MyContract { }
 )]
 #![cfg_attr(not(feature = "std"), no_std, no_main)]
 #![deny(rustdoc::broken_intra_doc_links)]
-#![feature(coverage_attribute)]
+#![cfg_attr(coverage_nightly, feature(coverage_attribute))]
 extern crate alloc;
 
 pub mod access;