Update examples eprintln to more accurately reflect error

examples/beep.rs

@@ -21,7 +21,7 @@ fn main() -> Result<(), failure::Error> {
         let data = match result {
             Ok(data) => data,
             Err(err) => {
-                eprintln!("stream {:?} closed due to an error: {}", id, err);
+                eprintln!("an error occurred on stream {:?}: {}", id, err);
                 return;
             }
         };

examples/feedback.rs

@@ -53,7 +53,7 @@ fn main() -> Result<(), failure::Error> {
             let data = match result {
                 Ok(data) => data,
                 Err(err) => {
-                    eprintln!("stream {:?} closed due to an error: {}", id, err);
+                    eprintln!("an error occurred on stream {:?}: {}", id, err);
                     return;
                 }
             };

examples/record_wav.rs

@@ -34,7 +34,7 @@ fn main() -> Result<(), failure::Error> {
             let data = match event {
                 Ok(data) => data,
                 Err(err) => {
-                    eprintln!("stream {:?} closed due to an error: {}", id, err);
+                    eprintln!("an error occurred on stream {:?}: {}", id, err);
                     return;
                 }
             };

src/emscripten/mod.rs

@@ -45,7 +45,7 @@ impl EventLoop {
 
     #[inline]
     pub fn run<F>(&self, callback: F) -> !
-        where F: FnMut(StreamId, StreamDataResult) + Send,
+        where F: FnMut(StreamId, StreamDataResult),
     {
         // The `run` function uses `set_timeout` to invoke a Rust callback repeatidely. The job
         // of this callback is to fill the content of the audio buffers.

src/lib.rs

@@ -70,7 +70,7 @@
 //!
 //! ```no_run
 //! # let event_loop = cpal::EventLoop::new();
-//! event_loop.run(move |_stream_id, _stream_event| {
+//! event_loop.run(move |_stream_id, _stream_result| {
 //!     // react to stream events and read or write stream data here
 //! });
 //! ```
@@ -90,8 +90,8 @@
 //! use cpal::{StreamData, UnknownTypeOutputBuffer};
 //!
 //! # let event_loop = cpal::EventLoop::new();
-//! event_loop.run(move |stream_id, stream_event| {
-//!     let stream_data = match stream_event {
+//! event_loop.run(move |stream_id, stream_result| {
+//!     let stream_data = match stream_result {
 //!         Ok(data) => data,
 //!         Err(err) => {
 //!             eprintln!("an error occurred on stream {:?}: {}", stream_id, err);