#[repr(C)]
pub struct aiocb {
    pub aio_fildes: c_int,
    pub aio_lio_opcode: c_int,
    pub aio_reqprio: c_int,
    pub aio_buf: *mut c_void,
    pub aio_nbytes: size_t,
    pub aio_sigevent: sigevent,
    pub aio_offset: off_t,
    /* private fields */
}
Performs copy-assignment from 
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Immutably borrows from an owned value. 
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Mutably borrows from an owned value. 
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Returns the argument unchanged.
Calls U::from(self).
That is, this conversion is whatever the implementation of
From<T> for U chooses to do.
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.