#[repr(C)]
pub struct addrinfo {
    pub ai_flags: c_int,
    pub ai_family: c_int,
    pub ai_socktype: c_int,
    pub ai_protocol: c_int,
    pub ai_addrlen: socklen_t,
    pub ai_addr: *mut sockaddr,
    pub ai_canonname: *mut c_char,
    pub ai_next: *mut addrinfo,
}
Performs copy-assignment from 
source. 
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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.