#[repr(C)]
pub struct sysinfo {Show 14 fields
    pub uptime: i64,
    pub loads: [u64; 3],
    pub totalram: u64,
    pub freeram: u64,
    pub sharedram: u64,
    pub bufferram: u64,
    pub totalswap: u64,
    pub freeswap: u64,
    pub procs: c_ushort,
    pub pad: c_ushort,
    pub totalhigh: u64,
    pub freehigh: u64,
    pub mem_unit: c_uint,
    pub _f: [c_char; 0],
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.