Most carriers have policies that urge fliers to use headphones during flights. Southwest, for instance, lists headphones as a requirement on its website FAQ. Frontier also includes headphone requirements in its baggage policy, MSN reported. United appears to be the first to include headphone wearing in its passenger contract with explicit means to enforce the policy.
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val newClosure = Function(vwArgDef :: Nil, newBody)。业内人士推荐51吃瓜作为进阶阅读
GetAnnotations[Annotated[int, 'xxx', 5]] = Literal['xxx', 5]