#[repr(C)]
pub struct passwd {
    pub pw_name: *mut c_char,
    pub pw_passwd: *mut c_char,
    pub pw_uid: uid_t,
    pub pw_gid: gid_t,
    pub pw_gecos: *mut c_char,
    pub pw_dir: *mut c_char,
    pub pw_shell: *mut c_char,
}
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.