// A Context carries a deadline, cancelation signal, and request-scoped values
// across API boundaries. Its methods are safe for simultaneous use by multiple
// goroutines.
type Context interface {
// Done returns a channel that is closed when this `Context` is canceled
// or times out.
Done() <-chan struct{}
// Err indicates why this Context was canceled, after the Done channel
// is closed.
Err() error
// Deadline returns the time when this Context will be canceled, if any.
Deadline() (deadline time.Time, ok bool)
// Value returns the value associated with key or nil if none.
Value(key interface{}) interface{}
}
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