#[repr(C)]
pub struct user {Show 14 fields
    pub regs: user_regs_struct,
    pub u_fpvalid: c_int,
    pub i387: user_fpregs_struct,
    pub u_tsize: c_ulonglong,
    pub u_dsize: c_ulonglong,
    pub u_ssize: c_ulonglong,
    pub start_code: c_ulonglong,
    pub start_stack: c_ulonglong,
    pub signal: c_longlong,
    pub u_ar0: *mut user_regs_struct,
    pub u_fpstate: *mut user_fpregs_struct,
    pub magic: c_ulonglong,
    pub u_comm: [c_char; 32],
    pub u_debugreg: [c_ulonglong; 8],
    /* private fields */
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.