#[repr(C)]
pub struct arpreq {
    pub arp_pa: sockaddr,
    pub arp_ha: sockaddr,
    pub arp_flags: c_int,
    pub arp_netmask: sockaddr,
    pub arp_dev: [c_char; 16],
}
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.