From 11e7e81d23ff8a2ea87805f3048bc30f4ef0dcbf Mon Sep 17 00:00:00 2001
From: Georges Palauqui <georges@foundationdevices.com>
Date: Wed, 20 Nov 2024 18:02:56 +0100
Subject: [PATCH] use rustversion to avoid an extra feature

---
 Cargo.toml              | 1 +
 stratum-v1/Cargo.toml   | 2 +-
 stratum-v1/src/error.rs | 4 ++--
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index f6dcfd6..4cf5e79 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -45,6 +45,7 @@ minicbor = { version = "0.24", features = ["derive"] }
 nom = { version = "7", default-features = false }
 phf = { version = "0.11", features = ["macros"], default-features = false }
 rand_xoshiro = "0.6"
+rustversion = "1.0"
 secp256k1 = { version = "0.29", default-features = false }
 serde = { version = "1.0.156", features = ["derive"], default-features = false }
 serde_json = "1"
diff --git a/stratum-v1/Cargo.toml b/stratum-v1/Cargo.toml
index 356a837..9aeb698 100644
--- a/stratum-v1/Cargo.toml
+++ b/stratum-v1/Cargo.toml
@@ -20,11 +20,11 @@ embedded-io-async = { workspace = true }
 faster-hex = { version = "0.10", default-features = false }
 heapless = { workspace = true, features = ["serde"] }
 log = { workspace = true, optional = true }
+rustversion = { workspace = true }
 serde = { workspace = true }
 serde-json-core = { workspace = true, features = ["custom-error-messages"] }
 
 [features]
-core-error = [] # bump MSRV to 1.81.0
 defmt-03 = [
     "dep:defmt",
     "embedded-io-async/defmt-03",
diff --git a/stratum-v1/src/error.rs b/stratum-v1/src/error.rs
index 96ea516..5c1d1a1 100644
--- a/stratum-v1/src/error.rs
+++ b/stratum-v1/src/error.rs
@@ -73,10 +73,10 @@ pub enum Error {
     HexError(faster_hex::Error),
 }
 
-#[cfg(feature = "core-error")]
+#[rustversion::since(1.81)]
 impl core::error::Error for Error {}
 
-#[cfg(feature = "core-error")]
+#[rustversion::since(1.81)]
 impl core::fmt::Display for Error {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         write!(f, "{self:?}")