28     elems: Box<[u8]>,  field
40         Ok(Self { elems: b, len: size })  in new()
47         if len <= self.elems.len() {  in reduce_len()
55         for i in 0..self.elems.len() {  in drop()
56             unsafe { write_volatile(self.elems.as_mut_ptr().add(i), 0) };  in drop()
58         if !self.elems.is_empty() {  in drop()
60                 unsafe { munlock(self.elems.as_ptr() as *const std::ffi::c_void, self.elems.len()) }  in drop()
72         &self.elems[0..self.len]  in deref()
78         &mut self.elems[0..self.len]  in deref_mut()
84         if self.elems.is_empty() {  in fmt()
117         Ok(Self { elems: b, len })  in try_from()