Build version-dependent examples only when supported

This reduces the noise in CI when checking MSRV.
serialport · May 12, 2024 · b71fc0e · b71fc0e
1 parent cb88008
commit b71fc0e
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diff --git 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
@@ -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>,