Args:         []string{"dt", "reason_string", "stack"},
		IsTimedEvent: true,
		StackIDs:     []int{2},
		StringIDs:    []int{1},
	},
	EvGoBlock: event.Spec{
		Name:         "GoBlock",
		Args:         []string{"dt", "reason_string", "stack"},
		IsTimedEvent: true,
		StackIDs:     []int{2},
		StringIDs:    []int{1},
	},
	EvGoUnblock: event.Spec{
		Name:         "GoUnblock",

	// is present, it is separated from the type with an underscore.
	// The valid argument types and the Go types they map to are listed
	// in the ArgTypes variable.
	Args []string

	// StringIDs indicates which of the arguments are string IDs.
	StringIDs []int

	// StackIDs indicates which of the arguments are stack IDs.
	//
	// The list is not sorted. The first index always refers to

		}
	}
	// N.B. Strings referenced by stack frames are validated
	// early on, when reading the stacks in to begin with.

	// Check strings.
	for _, i := range spec.StringIDs {
		id := stringID(e.base.args[i-1])
		_, ok := e.table.strings.get(id)
		if !ok {
			return fmt.Errorf("found invalid string ID %d for event %s", id, spec.Name)
		}
	}
	return nil
}