context/context.go
func WithProcessClosing(ctx context.Context, p goprocess.Process) context.Context {
	ctx, cancel := context.WithCancel(ctx)
	go func() {
		<-p.Closing()
		cancel()
	}()
	return ctx
}
func WithProcessClosing(ctx context.Context, p goprocess.Process) context.Context {
	ctx, cancel := context.WithCancel(ctx)
	go func() {
		<-p.Closing()
		cancel()
	}()
	return ctx
}
// WithProcessClosing returns a context.Context derived from ctx that
// is cancelled as p is Closing (after: <-p.Closing()). It is simply:
//
//   func WithProcessClosing(ctx context.Context, p goprocess.Process) context.Context {
//     ctx, cancel := context.WithCancel(ctx)
//     go func() {
//       <-p.Closing()
//       cancel()
//     }()
//     return ctx
//   }
//