#[repr(C)]
pub struct spwd {
    pub sp_namp: *mut c_char,
    pub sp_pwdp: *mut c_char,
    pub sp_lstchg: c_long,
    pub sp_min: c_long,
    pub sp_max: c_long,
    pub sp_warn: c_long,
    pub sp_inact: c_long,
    pub sp_expire: c_long,
    pub sp_flag: c_ulong,
}
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.