turtle adelalharbi$ RUST_BACKTRACE=1 cargo run --example rust
    Finished dev [unoptimized + debuginfo] target(s) in 0.0 secs
     Running `target/debug/examples/rust`
thread '<unnamed>' panicked at 'Windows can only be created on the main thread on macOS', /Users/adelalharbi/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.8.3/src/platform/macos/window.rs:306:16
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace
   1: std::panicking::default_hook::{{closure}}
   2: std::panicking::default_hook
   3: std::panicking::rust_panic_with_hook
   4: std::panicking::begin_panic
   5: winit::platform::platform::window::Window2::new
   6: winit::platform::platform::Window::new
   7: winit::window::<impl winit::WindowBuilder>::build
   8: glutin::platform::platform::Context::new
   9: glutin::GlWindow::new
  10: glutin_window::GlutinWindow::new
  11: <glutin_window::GlutinWindow as window::BuildFromWindowSettings>::build_from_window_settings
  12: window::WindowSettings::build
  13: <piston_window::PistonWindow<W> as window::BuildFromWindowSettings>::build_from_window_settings
  14: window::WindowSettings::build
  15: turtle::renderer::Renderer::run
  16: turtle::turtle_window::TurtleWindow::new::{{closure}}