type Context type Context interface { … // If Done is not yet closed, Err returns nil. // If Done is closed, Err returns a non-nil error explaining why: // DeadlineExceeded if the context's deadline passed, // or Canceled if the context was canceled for some other reason. // After Err returns a non-nil error, successive calls to Err return the same error. Err() error Done() (covered yesterday) and Err() (today) are the two methods you’ll virtually alway use when writing code to honor cont...
