Function default_read_buf_exact
pub(in ::io) fn default_read_buf_exact<R: Read + ?Sized>(this: &mut R, cursor: BorrowedCursor<'_, u8>) -> Result<()>default_read_buf_exactpub(in ::io) fn default_read_buf_exact<R: Read + ?Sized>(this: &mut R, cursor: BorrowedCursor<'_, u8>) -> Result<()>