Macro error_from 

macro_rules! error_from {
    ($ctx:literal, $($err_ty:ty),* $(,)?) => { ... };
}

Create default From<T> for Error, with optional extra context.

Example

use rustradio::error_from;
error_from!(
    "audio",
    cpal::PlayStreamError,
    cpal::BuildStreamError,
    cpal::DevicesError,
    cpal::DeviceNameError,
    cpal::SupportedStreamConfigsError,
    cpal::DefaultStreamConfigError,
);