From c3209197dfbc0c760c843c7905d49b83b99714e3 Mon Sep 17 00:00:00 2001
From: Christian Meusel <christian.meusel@posteo.de>
Date: Sun, 12 May 2024 17:25:37 +0200
Subject: [PATCH] Build version-dependent examples only when supported

This apparently does not reduce noise in CI but at least allows to build
the examples with Rust 1.59.0.
---
 Cargo.toml           |  1 +
 examples/loopback.rs | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index 7280727e..a3932436 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -47,6 +47,7 @@ assert_hex = "0.4.1"
 clap = { version = "3.1.6", features = ["derive"] }
 envconfig = "0.10.0"
 rstest = { version = "0.12.0", default-features = false }
+rustversion = "1.0.16"
 
 [features]
 default = ["libudev"]
diff --git a/examples/loopback.rs b/examples/loopback.rs
index 65f5bd35..dc519345 100644
--- a/examples/loopback.rs
+++ b/examples/loopback.rs
@@ -193,6 +193,16 @@ fn loopback_standard<'a>(
     }
 }
 
+#[rustversion::before(1.63)]
+fn loopback_split<'a>(
+    _port: &mut Box<dyn SerialPort>,
+    _read_stats: &mut Stats<'a>,
+    _write_stats: &mut Stats<'a>,
+) {
+    unimplemented!("requires Rust 1.63 or later");
+}
+
+#[rustversion::since(1.63)]
 fn loopback_split<'a>(
     port: &mut Box<dyn SerialPort>,
     read_stats: &mut Stats<'a>,