if err != nil {
			return nil, err
		}
		return compute(gToIntervals, t.events)
	}
}

// pprofMatchingGoroutines returns the ids of goroutines of the matching name and its interval.
// If the id string is empty, returns nil without an error.
func pprofMatchingGoroutines(name string, t *parsedTrace) (map[trace.GoID][]interval, error) {
	res := make(map[trace.GoID][]interval)