use rustversion to gate core::error

Author: jordens

CHANGELOG.md

@@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
-* `impl core::error::Error for Error`
+* `impl core::error::Error for Error` on rust >= 1.81
 
 ## [v0.6.0] - 2024-08-30
 

Cargo.toml

@@ -11,10 +11,10 @@ readme = "README.md"
 [dependencies]
 embedded-io = "0.6.1"
 noline = { version = "0.5.0", optional = true }
+rustversion = "1.0.17"
 
 [features]
 default = ["echo"]
-error-in-core = []  # requires rust 1.81.0
 echo = []
 
 [dev-dependencies]

src/lib.rs

@@ -133,7 +133,7 @@ impl core::fmt::Display for Error {
     }
 }
 
-#[cfg(feature = "error-in-core")]
+#[rustversion::since(1.81)]
 impl core::error::Error for Error {}
 
 /// Looks for the named parameter in the parameter list of the item, then