#[repr(C)]
pub struct statfs {
    pub f_type: __fsword_t,
    pub f_bsize: __fsword_t,
    pub f_blocks: fsblkcnt_t,
    pub f_bfree: fsblkcnt_t,
    pub f_bavail: fsblkcnt_t,
    pub f_files: fsfilcnt_t,
    pub f_ffree: fsfilcnt_t,
    pub f_fsid: fsid_t,
    pub f_namelen: __fsword_t,
    pub f_frsize: __fsword_t,
    /* private fields */
}
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.