No, I tried that! That actually moves the "Cannot move" error to the "self.buffers" use itself. The reason I can't just iterate by value is that I'd be consumi

No, I tried that! That actually moves the "Cannot move" error to the "self.buffers" use itself. The reason I can't just iterate by value is that I'd be consuming data that is already held by the map. The buffer is defined thus: use bitstream_io::{BigEndian, BitWriter}; struct PostingBuffer<W: io::Write> { bw: BitWriter<W, BigEndian>, // ... } impl PostingBuffer { pub fn get_data(self) -> W { self.bw.into_writer() } } bitstream_io::BitWriter's [1] into_writer consumes itself: pub fn into_writer(self) -> W { self.writer } [1] https://docs.rs/bitstream-io/0.8.2/bitstream_io/write/struct.BitWriter.html https://docs.rs/bitstream-io/0.8.2/bitstream_io/write/struct...