func NewInvariantMutex(check func()) (mu InvariantMutex) {
	if check == nil {
		panic("check must be non-nil.")
	}

	mu.check = check
	mu.checkIfEnabled()

	return
}
func NewInvariantMutex(check func()) (mu InvariantMutex) {
	if check == nil {
		panic("check must be non-nil.")
	}

	mu.check = check
	mu.checkIfEnabled()

	return
}
func NewInvariantMutex ( check func ( ) ) ( mu InvariantMutex ) { if check == nil { panic ( " " ) } mu . check = check mu . checkIfEnabled ( ) return }
// Create a lock which, when EnableInvariantChecking has been called, will call
// the supplied function at moments when invariants protected by the lock
// should hold (e.g. just after acquiring the lock). The function should crash
// if an invariant is violated. It should not have side effects, as there are
// no guarantees that it will run.
//
// The invariants must hold at the time that NewInvariantMutex is called.
Create a lock which when EnableInvariantChecking has been called will call the supplied function at moments when invariants protected by the lock should hold ( e . g . just after acquiring the lock ) . The function should crash if an invariant is violated . It should not have side effects as there are no guarantees that it will run . The invariants must hold at the time that NewInvariantMutex is called .