diff --git a/src/io.h b/src/io.h
index a68795591..ec9af69cf 100644
--- a/src/io.h
+++ b/src/io.h
@@ -170,127 +170,11 @@ class separated_buffer_t : noncopyable_t {
 /// Describes what type of IO operation an io_data_t represents.
 enum class io_mode_t { file, pipe, fd, close, bufferfill };
 
-/// Represents an FD redirection.
-class io_data_t : noncopyable_t, nonmovable_t {
-   protected:
-    io_data_t(io_mode_t m, int fd, int source_fd) : io_mode(m), fd(fd), source_fd(source_fd) {}
-
-   public:
-    /// Type of redirect.
-    const io_mode_t io_mode;
-
-    /// FD to redirect.
-    const int fd;
-
-    /// Source fd. This is dup2'd to fd, or if it is -1, then fd is closed.
-    /// That is, we call dup2(source_fd, fd).
-    const int source_fd;
-
-    virtual void print() const = 0;
-    virtual ~io_data_t() = 0;
-};
-
-class io_close_t final : public io_data_t {
-   public:
-    explicit io_close_t(int f) : io_data_t(io_mode_t::close, f, -1) {}
-
-    void print() const override;
-    ~io_close_t() override;
-};
-
-class io_fd_t final : public io_data_t {
-   public:
-    void print() const override;
-
-    ~io_fd_t() override;
-
-    /// fd to redirect specified fd to. For example, in 2>&1, source_fd is 1, and io_data_t::fd
-    /// is 2.
-    io_fd_t(int f, int source_fd) : io_data_t(io_mode_t::fd, f, source_fd) {}
-};
-
-/// Represents a redirection to or from an opened file.
-class io_file_t final : public io_data_t {
-   public:
-    void print() const override;
-
-    io_file_t(int fd, autoclose_fd_t file)
-        : io_data_t(io_mode_t::file, fd, file.fd()), file_fd_(std::move(file)) {
-        // Invalid file redirections are replaced with a closed fd, so the following
-        // assertion isn't guaranteed to pass:
-        // assert(file_fd_.valid() && "File is not valid");
-    }
-
-    ~io_file_t() override;
-
-   private:
-    // The fd for the file which we are writing to or reading from.
-    autoclose_fd_t file_fd_;
-};
-
-/// Represents (one end) of a pipe.
-class io_pipe_t final : public io_data_t {
-    // The pipe's fd. Conceptually this is dup2'd to io_data_t::fd.
-    autoclose_fd_t pipe_fd_;
-
-    /// Whether this is an input pipe. This is used only for informational purposes.
-    const bool is_input_;
-
-   public:
-    void print() const override;
-
-    io_pipe_t(int fd, bool is_input, autoclose_fd_t pipe_fd)
-        : io_data_t(io_mode_t::pipe, fd, pipe_fd.fd()),
-          pipe_fd_(std::move(pipe_fd)),
-          is_input_(is_input) {
-        assert(pipe_fd_.valid() && "Pipe is not valid");
-    }
-
-    ~io_pipe_t() override;
-};
-
 class io_buffer_t;
 
-/// Represents filling an io_buffer_t. Very similar to io_pipe_t.
-class io_bufferfill_t final : public io_data_t {
-    /// Write end. The other end is connected to an io_buffer_t.
-    const autoclose_fd_t write_fd_;
-
-    /// The receiving buffer.
-    const std::shared_ptr<io_buffer_t> buffer_;
-
-   public:
-    void print() const override;
-
-    // The ctor is public to support make_shared() in the static create function below.
-    // Do not invoke this directly.
-    io_bufferfill_t(int target, autoclose_fd_t write_fd, std::shared_ptr<io_buffer_t> buffer)
-        : io_data_t(io_mode_t::bufferfill, target, write_fd.fd()),
-          write_fd_(std::move(write_fd)),
-          buffer_(std::move(buffer)) {
-        assert(write_fd_.valid() && "fd is not valid");
-    }
-
-    ~io_bufferfill_t() override;
-
-    std::shared_ptr<io_buffer_t> buffer() const { return buffer_; }
-
-    /// Create an io_bufferfill_t which, when written from, fills a buffer with the contents.
-    /// \returns nullptr on failure, e.g. too many open fds.
-    ///
-    /// \param target the fd which this will be dup2'd to - typically stdout.
-    static shared_ptr<io_bufferfill_t> create(size_t buffer_limit = 0, int target = STDOUT_FILENO);
-
-    /// Reset the receiver (possibly closing the write end of the pipe), and complete the fillthread
-    /// of the buffer. \return the buffer.
-    static separated_buffer_t finish(std::shared_ptr<io_bufferfill_t> &&filler);
-};
-
 struct callback_args_t;
 struct autoclose_fd_t2;
 
-using io_data_ref_t = std::shared_ptr<const io_data_t>;
-
 using io_chain_t = IoChain;
 
 dup2_list_t dup2_list_resolve_chain_shim(const io_chain_t &io_chain);