Fix a panic condition in the RX example.

This would occur when the sample thread disconnected
before the main thread requested a disconnection.

CHANGELOG.md

@@ -4,6 +4,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+### Added
+- Added tested platforms to the README.
+
+### Fixed
+- Fixed a panic condition in the `rx` example that occurred when the sample
+  thread disconnected before the main thread requested a disconnection.
+
 ## [0.2.0] - 2021-05-09
 ### Added
 - Added `impl std::error::Error for Error`.

examples/rx.rs

@@ -84,9 +84,10 @@ fn main() {
 
     println!("Shutting down sample thread");
 
-    exit_tx
-        .send(())
-        .expect("Failed to send exit event to sample thread");
+    if let Err(e) = exit_tx.send(()) {
+        println!("Failed to send exit event (receiver disconnected): {}", e);
+    }
+
     sample_thread
         .join()
         .expect("Failed to join sample thread")