#[repr(C)]
pub struct mntent {
    pub mnt_fsname: *mut c_char,
    pub mnt_dir: *mut c_char,
    pub mnt_type: *mut c_char,
    pub mnt_opts: *mut c_char,
    pub mnt_freq: c_int,
    pub mnt_passno: c_int,
}
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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.