chore(3p/immer): Remove vendored copy of immer r/2029

We ended up dropping the use of this library again.

Change-Id: I2c44cd22a6128d23f87a582402bf5fb84991d608
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2292
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>

19 files changed, 0 insertions, 1370 deletions

diff --git a/third_party/immer/extra/guile/CMakeLists.txt b/third_party/immer/extra/guile/CMakeLists.txt
deleted file mode 100644
index 99338060d6da..000000000000
--- a/third_party/immer/extra/guile/CMakeLists.txt
+++ /dev/null
@@ -1,24 +0,0 @@
-
-find_package(PkgConfig)
-
-pkg_check_modules(Guile guile-2.2)
-
-if (NOT Guile_FOUND)
-  message(STATUS "Disabling Guile modules")
-  return()
-endif()
-
-set(GUILE_EXTENSION_DIR ${CMAKE_CURRENT_BINARY_DIR})
-configure_file(immer.scm.in immer.scm)
-
-add_library(guile-immer SHARED EXCLUDE_FROM_ALL
-  src/immer.cpp)
-target_include_directories(guile-immer PUBLIC
-  ${CMAKE_CURRENT_SOURCE_DIR}
-  ${CALLABLE_TRAITS_INCLUDE_DIR}
-  ${Guile_INCLUDE_DIRS})
-target_link_libraries(guile-immer PUBLIC
-  immer
-  ${Guile_LIBRARIES})
-
-add_custom_target(guile DEPENDS guile-immer)
diff --git a/third_party/immer/extra/guile/README.rst b/third_party/immer/extra/guile/README.rst
deleted file mode 100644
index 09cf8be644ec..000000000000
--- a/third_party/immer/extra/guile/README.rst
+++ /dev/null
@@ -1,144 +0,0 @@
-
-Guile bindings
-==============
-
-This library includes experimental bindings bring efficient immutable
-vectors for the `GNU Guile`_ Scheme implementation.  The interface is
-somewhat **incomplete**, but you can already do something interesting
-things like:
-
-.. literalinclude:: ../extra/guile/example.scm
-   :language: scheme
-   :start-after: intro/start
-   :end-before:  intro/end
-..
-
-    **Do you want to help** making these bindings complete and production
-    ready?  Drop a line at `immer@sinusoid.al
-    <mailto:immer@sinusoid.al>`_ or `open an issue on Github
-    <https://github.com/arximboldi/immer>`_
-
-.. _GNU Guile: https://www.gnu.org/software/guile/
-
-Installation
-------------
-
-.. highlight:: sh
-
-To install the software, you need `GNU Guile 2.2
-<https://www.gnu.org/software/guile/download/>`_.  Then you have to
-`clone the repository <https://github.com/arximboldi/immer>`_ and
-inside the repository do something like::
-
-    mkdir build; cd build
-    cmake .. -DCMAKE_BUILD_TYPE=Release \
-             -DGUILE_EXTENSION_DIR="<somewhere...>"
-    make guile
-    cp extra/guile/libguile-immer.so "<...the GUILE_EXTENSION_DIR>"
-    cp extra/guile/immer.scm "<somewhere in your GUILE_LOAD_PATH>"
-
-Benchmarks
-----------
-
-The library includes some quick and dirty benchmarks that show how
-these vectors perform compared to *mutable vectors*, *lists*, and
-*v-lists*.  Once you have installed the library, you may run them by
-executing the following in the project root::
-
-    guile extra/guile/benchmark.scm
-
-This is the output I get when running those:
-
-.. code-block:: scheme
-   :name: benchmark-output
-
-   (define bench-size 1000000)
-   (define bench-samples 10)
-   ;;;; benchmarking creation...
-   ; evaluating:
-         (apply ivector (iota bench-size))
-   ; average time: 0.0608697784 seconds
-   ; evaluating:
-         (apply ivector-u32 (iota bench-size))
-   ; average time: 0.0567354933 seconds
-   ; evaluating:
-         (iota bench-size)
-   ; average time: 0.032995402 seconds
-   ; evaluating:
-         (apply vector (iota bench-size))
-   ; average time: 0.0513594425 seconds
-   ; evaluating:
-         (apply u32vector (iota bench-size))
-   ; average time: 0.0939185315 seconds
-   ; evaluating:
-         (list->vlist (iota bench-size))
-   ; average time: 0.2369570977 seconds
-   ;;;; benchmarking iteration...
-   (define bench-ivector (apply ivector (iota bench-size)))
-   (define bench-ivector-u32 (apply ivector-u32 (iota bench-size)))
-   (define bench-list (iota bench-size))
-   (define bench-vector (apply vector (iota bench-size)))
-   (define bench-u32vector (apply u32vector (iota bench-size)))
-   (define bench-vlist (list->vlist (iota bench-size)))
-   ; evaluating:
-         (ivector-fold + 0 bench-ivector)
-   ; average time: 0.035750341 seconds
-   ; evaluating:
-         (ivector-u32-fold + 0 bench-ivector-u32)
-   ; average time: 0.0363843682 seconds
-   ; evaluating:
-         (fold + 0 bench-list)
-   ; average time: 0.0271881423 seconds
-   ; evaluating:
-         (vector-fold + 0 bench-vector)
-   ; average time: 0.0405022349 seconds
-   ; evaluating:
-         (vlist-fold + 0 bench-vlist)
-   ; average time: 0.0424709098 seconds
-   ;;;; benchmarking iteration by index...
-   ; evaluating:
-         (let iter ((i 0) (acc 0))
-           (if (< i (ivector-length bench-ivector))
-             (iter (+ i 1) (+ acc (ivector-ref bench-ivector i)))
-             acc))
-   ; average time: 0.2195658936 seconds
-   ; evaluating:
-         (let iter ((i 0) (acc 0))
-           (if (< i (ivector-u32-length bench-ivector-u32))
-             (iter (+ i 1) (+ acc (ivector-u32-ref bench-ivector-u32 i)))
-             acc))
-   ; average time: 0.2205486326 seconds
-   ; evaluating:
-         (let iter ((i 0) (acc 0))
-           (if (< i (vector-length bench-vector))
-             (iter (+ i 1) (+ acc (vector-ref bench-vector i)))
-             acc))
-   ; average time: 0.0097157637 seconds
-   ; evaluating:
-         (let iter ((i 0) (acc 0))
-           (if (< i (u32vector-length bench-u32vector))
-             (iter (+ i 1) (+ acc (u32vector-ref bench-u32vector i)))
-             acc))
-   ; average time: 0.0733736008 seconds
-   ; evaluating:
-         (let iter ((i 0) (acc 0))
-           (if (< i (vlist-length bench-vlist))
-             (iter (+ i 1) (+ acc (vlist-ref bench-vlist i)))
-             acc))
-   ; average time: 0.3220357243 seconds
-   ;;;; benchmarking concatenation...
-   ; evaluating:
-         (ivector-append bench-ivector bench-ivector)
-   ; average time: 1.63022e-5 seconds
-   ; evaluating:
-         (ivector-u32-append bench-ivector-u32 bench-ivector-u32)
-   ; average time: 1.63754e-5 seconds
-   ; evaluating:
-         (append bench-list bench-list)
-   ; average time: 0.0135592963 seconds
-   ; evaluating:
-         (vector-append bench-vector bench-vector)
-   ; average time: 0.0044506586 seconds
-   ; evaluating:
-         (vlist-append bench-vlist bench-vlist)
-   ; average time: 0.3227312512 seconds
diff --git a/third_party/immer/extra/guile/benchmark.scm b/third_party/immer/extra/guile/benchmark.scm
deleted file mode 100644
index 463a8eb17d9e..000000000000
--- a/third_party/immer/extra/guile/benchmark.scm
+++ /dev/null
@@ -1,168 +0,0 @@
-;;
-;; immer: immutable data structures for C++
-;; Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-;;
-;; This software is distributed under the Boost Software License, Version 1.0.
-;; See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-;;
-
-(use-modules (immer)
-             (fector) ; https://wingolog.org/pub/fector.scm
-             (srfi srfi-1)
-             (srfi srfi-43)
-             (ice-9 vlist)
-             (ice-9 pretty-print)
-             (rnrs bytevectors))
-
-(define-syntax display-eval
-  (syntax-rules ()
-    ((_ expr)
-     (begin (pretty-print 'expr
-                          #:max-expr-width 72)
-            expr))))
-
-(display-eval (define bench-size 1000000))
-(display-eval (define bench-samples 10))
-
-(define (average . ns)
-  (/ (apply + ns) (length ns)))
-
-(define (generate-n n fn)
-  (unfold (lambda (x) (= x n))
-          (lambda (x) (fn))
-          (lambda (x) (+ x 1))
-          0))
-
-(define-syntax benchmark
-  (syntax-rules ()
-    ((_ expr)
-     (begin
-       (display "; evaluating:    ") (newline)
-       (pretty-print 'expr
-                     #:max-expr-width 72
-                     #:per-line-prefix "      ")
-       (let* ((sample (lambda ()
-                        (gc)
-                        (let* ((t0 (get-internal-real-time))
-                               (r  expr)
-                               (t1 (get-internal-real-time)))
-                          (/ (- t1 t0) internal-time-units-per-second))))
-              (samples (generate-n bench-samples sample))
-              (result (apply average samples)))
-         (display "; average time: ")
-         (display (exact->inexact result))
-         (display " seconds")
-         (newline))))))
-
-(display ";;;; benchmarking creation...") (newline)
-
-(display-eval
- (define (fector . args)
-   (persistent-fector (fold (lambda (v fv) (fector-push! fv v))
-                            (transient-fector)
-                            args))))
-
-(benchmark (apply ivector (iota bench-size)))
-(benchmark (apply ivector-u32 (iota bench-size)))
-(benchmark (iota bench-size))
-(benchmark (apply vector (iota bench-size)))
-(benchmark (apply u32vector (iota bench-size)))
-(benchmark (list->vlist (iota bench-size)))
-(benchmark (apply fector (iota bench-size)))
-
-(display ";;;; benchmarking iteration...") (newline)
-
-(display-eval (define bench-ivector (apply ivector (iota bench-size))))
-(display-eval (define bench-ivector-u32 (apply ivector-u32 (iota bench-size))))
-(display-eval (define bench-list (iota bench-size)))
-(display-eval (define bench-vector (apply vector (iota bench-size))))
-(display-eval (define bench-u32vector (apply u32vector (iota bench-size))))
-(display-eval (define bench-vlist (list->vlist (iota bench-size))))
-(display-eval (define bench-fector (apply fector (iota bench-size))))
-(display-eval (define bench-bytevector-u32
-                (uint-list->bytevector (iota bench-size)
-                                       (native-endianness)
-                                       4)))
-
-(benchmark (ivector-fold + 0 bench-ivector))
-(benchmark (ivector-u32-fold + 0 bench-ivector-u32))
-(benchmark (fold + 0 bench-list))
-(benchmark (vector-fold + 0 bench-vector))
-(benchmark (vlist-fold + 0 bench-vlist))
-(benchmark (fector-fold + bench-fector 0))
-
-(display ";;;; benchmarking iteration by index...") (newline)
-
-(display-eval
- (define-syntax iteration-by-index
-   (syntax-rules ()
-     ((_ *length *ref *vector *step)
-      (let ((len (*length *vector)))
-        (let iter ((i 0) (acc 0))
-          (if (< i len)
-              (iter (+ i *step)
-                    (+ acc (*ref *vector i)))
-              acc)))))))
-
-(display-eval
- (define-syntax iteration-by-index-truncate
-   (syntax-rules ()
-     ((_ *length *ref *vector *step)
-      (let ((len (*length *vector)))
-        (let iter ((i 0) (acc 0))
-          (if (< i len)
-              (iter (+ i *step)
-                    (logand #xffffffffFFFFFFFF
-                            (+ acc (*ref *vector i))))
-              acc)))))))
-
-(benchmark (iteration-by-index ivector-length
-                               ivector-ref
-                               bench-ivector 1))
-(benchmark (iteration-by-index ivector-u32-length
-                               ivector-u32-ref
-                               bench-ivector-u32 1))
-(benchmark (iteration-by-index vector-length
-                               vector-ref
-                               bench-vector 1))
-(benchmark (iteration-by-index u32vector-length
-                               u32vector-ref
-                               bench-u32vector 1))
-(benchmark (iteration-by-index vlist-length
-                               vlist-ref
-                               bench-vlist 1))
-(benchmark (iteration-by-index fector-length
-                               fector-ref
-                               bench-fector 1))
-(benchmark (iteration-by-index bytevector-length
-                               bytevector-u32-native-ref
-                               bench-bytevector-u32 4))
-
-(benchmark (iteration-by-index-truncate ivector-length
-                                        ivector-ref
-                                        bench-ivector 1))
-(benchmark (iteration-by-index-truncate ivector-u32-length
-                                        ivector-u32-ref
-                                        bench-ivector-u32 1))
-(benchmark (iteration-by-index-truncate vector-length
-                                        vector-ref
-                                        bench-vector 1))
-(benchmark (iteration-by-index-truncate u32vector-length
-                                        u32vector-ref
-                                        bench-u32vector 1))
-(benchmark (iteration-by-index-truncate vlist-length
-                                        vlist-ref
-                                        bench-vlist 1))
-(benchmark (iteration-by-index-truncate fector-length
-                                        fector-ref
-                                        bench-fector 1))
-(benchmark (iteration-by-index-truncate bytevector-length
-                                        bytevector-u32-native-ref
-                                        bench-bytevector-u32 4))
-
-(display ";;;; benchmarking concatenation...") (newline)
-(benchmark (ivector-append bench-ivector bench-ivector))
-(benchmark (ivector-u32-append bench-ivector-u32 bench-ivector-u32))
-(benchmark (append bench-list bench-list))
-(benchmark (vector-append bench-vector bench-vector))
-(benchmark (vlist-append bench-vlist bench-vlist))
diff --git a/third_party/immer/extra/guile/example.scm b/third_party/immer/extra/guile/example.scm
deleted file mode 100644
index 6649508cedc3..000000000000
--- a/third_party/immer/extra/guile/example.scm
+++ /dev/null
@@ -1,51 +0,0 @@
-;;
-;; immer: immutable data structures for C++
-;; Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-;;
-;; This software is distributed under the Boost Software License, Version 1.0.
-;; See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-;;
-
-;; include:intro/start
-(use-modules (immer)
-             (rnrs base))
-
-(let ((v1 (ivector 1 "hola" 3 'que #:tal)))
-  (assert (eq? (ivector-ref v1 3) 'que))
-
-  (let* ((v2 (ivector-set v1 3 'what))
-         (v2 (ivector-update v2 2 (lambda (x) (+ 1 x)))))
-    (assert (eq? (ivector-ref v1 2) 3))
-    (assert (eq? (ivector-ref v1 3) 'que))
-    (assert (eq? (ivector-ref v2 2) 4))
-    (assert (eq? (ivector-ref v2 3) 'what))
-
-    (let ((v3 (ivector-push v2 "hehe")))
-      (assert (eq? (ivector-length v3) 6))
-      (assert (eq? (ivector-ref v3 (- (ivector-length v3) 1)) "hehe")))))
-
-(let ((v (apply ivector (iota 10))))
-  (assert (eq? (ivector-length v) 10))
-  (assert (eq? (ivector-length (ivector-drop v 3)) 7))
-  (assert (eq? (ivector-length (ivector-take v 3)) 3))
-  (assert (eq? (ivector-length (ivector-append v v)) 20)))
-
-(let ((v1 (make-ivector 3))
-      (v2 (make-ivector 3 ":)")))
-  (assert (eq? (ivector-ref v1 2)
-               (vector-ref (make-vector 3) 2)))
-  (assert (eq? (ivector-ref v2 2) ":)")))
-;; include:intro/end
-
-;; Experiments
-
-(let ((d (dummy)))
-  (dummy-foo d)
-  (dummy-bar d 42))
-(gc)
-
-(func1)
-(func2)
-(func3 (dummy) 12)
-(foo-func1)
-(gc)
diff --git a/third_party/immer/extra/guile/immer.scm.in b/third_party/immer/extra/guile/immer.scm.in
deleted file mode 100644
index 8624aabd5bf4..000000000000
--- a/third_party/immer/extra/guile/immer.scm.in
+++ /dev/null
@@ -1,5 +0,0 @@
-(define-module (immer))
-
-;; The extension automatically exports the names via 'scm_c_export'
-(load-extension "@GUILE_EXTENSION_DIR@/libguile-immer"
-                "init_immer")
diff --git a/third_party/immer/extra/guile/scm/detail/convert.hpp b/third_party/immer/extra/guile/scm/detail/convert.hpp
deleted file mode 100644
index 4c87ff185669..000000000000
--- a/third_party/immer/extra/guile/scm/detail/convert.hpp
+++ /dev/null
@@ -1,58 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#include <scm/detail/util.hpp>
-
-#include <cstdint>
-#include <type_traits>
-#include <utility>
-
-#include <libguile.h>
-
-namespace scm {
-namespace detail {
-
-template <typename T, typename Enable=void>
-struct convert;
-
-template <typename T>
-auto to_scm(T&& v)
-    -> SCM_DECLTYPE_RETURN(
-        convert<std::decay_t<T>>::to_scm(std::forward<T>(v)));
-
-template <typename T>
-auto to_cpp(SCM v)
-    -> SCM_DECLTYPE_RETURN(
-        convert<std::decay_t<T>>::to_cpp(v));
-
-} // namespace detail
-} // namespace scm
-
-#define SCM_DECLARE_NUMERIC_TYPE(cpp_name__, scm_name__)                \
-    namespace scm {                                                     \
-    namespace detail {                                                  \
-    template <>                                                         \
-    struct convert<cpp_name__> {                                        \
-        static cpp_name__ to_cpp(SCM v) { return scm_to_ ## scm_name__(v); } \
-        static SCM to_scm(cpp_name__ v) { return scm_from_ ## scm_name__(v); } \
-    };                                                                  \
-    }} /* namespace scm::detail */                                      \
-    /**/
-
-SCM_DECLARE_NUMERIC_TYPE(float,         double);
-SCM_DECLARE_NUMERIC_TYPE(double,        double);
-SCM_DECLARE_NUMERIC_TYPE(std::int8_t,   int8);
-SCM_DECLARE_NUMERIC_TYPE(std::int16_t,  int16);
-SCM_DECLARE_NUMERIC_TYPE(std::int32_t,  int32);
-SCM_DECLARE_NUMERIC_TYPE(std::int64_t,  int64);
-SCM_DECLARE_NUMERIC_TYPE(std::uint8_t,  uint8);
-SCM_DECLARE_NUMERIC_TYPE(std::uint16_t, uint16);
-SCM_DECLARE_NUMERIC_TYPE(std::uint32_t, uint32);
-SCM_DECLARE_NUMERIC_TYPE(std::uint64_t, uint64);
diff --git a/third_party/immer/extra/guile/scm/detail/define.hpp b/third_party/immer/extra/guile/scm/detail/define.hpp
deleted file mode 100644
index 08b6e763381f..000000000000
--- a/third_party/immer/extra/guile/scm/detail/define.hpp
+++ /dev/null
@@ -1,36 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#ifndef SCM_AUTO_EXPORT
-#define SCM_AUTO_EXPORT 1
-#endif
-
-#include <scm/detail/subr_wrapper.hpp>
-#include <scm/list.hpp>
-
-namespace scm {
-namespace detail {
-
-template <typename Tag, typename Fn>
-static void define_impl(const std::string& name, Fn fn)
-{
-    using args_t = function_args_t<Fn>;
-    constexpr auto args_size = pack_size_v<args_t>;
-    constexpr auto has_rest  = std::is_same<pack_last_t<args_t>, scm::args>{};
-    constexpr auto arg_count = args_size - has_rest;
-    auto subr = (scm_t_subr) +subr_wrapper_aux<Tag>(fn, args_t{});
-    scm_c_define_gsubr(name.c_str(), arg_count, 0, has_rest, subr);
-#if SCM_AUTO_EXPORT
-    scm_c_export(name.c_str());
-#endif
-}
-
-} // namespace detail
-} // namespace scm
diff --git a/third_party/immer/extra/guile/scm/detail/finalizer_wrapper.hpp b/third_party/immer/extra/guile/scm/detail/finalizer_wrapper.hpp
deleted file mode 100644
index 258249eb2c73..000000000000
--- a/third_party/immer/extra/guile/scm/detail/finalizer_wrapper.hpp
+++ /dev/null
@@ -1,62 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#include <scm/detail/invoke.hpp>
-#include <scm/detail/function_args.hpp>
-#include <scm/detail/convert.hpp>
-
-namespace scm {
-namespace detail {
-// this anonymous namespace should help avoiding registration clashes
-// among translation units.
-namespace {
-
-template <typename Tag, typename Fn>
-auto finalizer_wrapper_impl(Fn fn, pack<>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] { invoke(fn_); };
-}
-template <typename Tag, typename Fn, typename T1>
-auto finalizer_wrapper_impl(Fn fn, pack<T1>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] (SCM a1) { invoke(fn_, to_cpp<T1>(a1)); };
-}
-template <typename Tag, typename Fn, typename T1, typename T2>
-auto finalizer_wrapper_impl(Fn fn, pack<T1, T2>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] (SCM a1, SCM a2) {
-        invoke(fn_, to_cpp<T1>(a1), to_cpp<T2>(a2));
-    };
-}
-template <typename Tag, typename Fn, typename T1, typename T2, typename T3>
-auto finalizer_wrapper_impl(Fn fn, pack<T1, T2, T3>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] (SCM a1, SCM a2, SCM a3) {
-        invoke(fn_, to_cpp<T1>(a1), to_cpp<T2>(a2), to_cpp<T3>(a3));
-    };
-}
-
-template <typename Tag, typename Fn>
-auto finalizer_wrapper(Fn fn)
-{
-    return finalizer_wrapper_impl<Tag>(fn, function_args_t<Fn>{});
-}
-
-} // anonymous namespace
-} // namespace detail
-} // namespace scm
diff --git a/third_party/immer/extra/guile/scm/detail/function_args.hpp b/third_party/immer/extra/guile/scm/detail/function_args.hpp
deleted file mode 100644
index 809e3eb1979b..000000000000
--- a/third_party/immer/extra/guile/scm/detail/function_args.hpp
+++ /dev/null
@@ -1,21 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#include <scm/detail/pack.hpp>
-#include <boost/callable_traits/args.hpp>
-
-namespace scm {
-namespace detail {
-
-template <typename Fn>
-using function_args_t = boost::callable_traits::args_t<Fn, pack>;
-
-} // namespace detail
-} // namespace scm
diff --git a/third_party/immer/extra/guile/scm/detail/invoke.hpp b/third_party/immer/extra/guile/scm/detail/invoke.hpp
deleted file mode 100644
index d9f2b37ccece..000000000000
--- a/third_party/immer/extra/guile/scm/detail/invoke.hpp
+++ /dev/null
@@ -1,39 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-// Adapted from the official std::invoke proposal:
-// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4169.html
-
-#include <type_traits>
-#include <functional>
-
-namespace scm {
-namespace detail {
-
-template <typename Functor, typename... Args>
-std::enable_if_t<
-    std::is_member_pointer<std::decay_t<Functor>>::value,
-    std::result_of_t<Functor&&(Args&&...)>>
-invoke(Functor&& f, Args&&... args)
-{
-    return std::mem_fn(f)(std::forward<Args>(args)...);
-}
-
-template <typename Functor, typename... Args>
-std::enable_if_t<
-    !std::is_member_pointer<std::decay_t<Functor>>::value,
-    std::result_of_t<Functor&&(Args&&...)>>
-invoke(Functor&& f, Args&&... args)
-{
-    return std::forward<Functor>(f)(std::forward<Args>(args)...);
-}
-
-} // namespace detail
-} // namespace scm
diff --git a/third_party/immer/extra/guile/scm/detail/pack.hpp b/third_party/immer/extra/guile/scm/detail/pack.hpp
deleted file mode 100644
index 9a1813570bcd..000000000000
--- a/third_party/immer/extra/guile/scm/detail/pack.hpp
+++ /dev/null
@@ -1,52 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-namespace scm {
-namespace detail {
-
-struct none_t;
-
-template <typename... Ts>
-struct pack {};
-
-template <typename Pack>
-struct pack_size;
-
-template <typename... Ts>
-struct pack_size<pack<Ts...>>
-{
-    static constexpr auto value = sizeof...(Ts);
-};
-
-template <typename Pack>
-constexpr auto pack_size_v = pack_size<Pack>::value;
-
-template <typename Pack>
-struct pack_last
-{
-    using type = none_t;
-};
-
-template <typename T, typename ...Ts>
-struct pack_last<pack<T, Ts...>>
-    : pack_last<pack<Ts...>>
-{};
-
-template <typename T>
-struct pack_last<pack<T>>
-{
-    using type = T;
-};
-
-template <typename Pack>
-using pack_last_t = typename pack_last<Pack>::type;
-
-} // namespace detail
-} // namespace scm
diff --git a/third_party/immer/extra/guile/scm/detail/subr_wrapper.hpp b/third_party/immer/extra/guile/scm/detail/subr_wrapper.hpp
deleted file mode 100644
index fc11ff1c51ec..000000000000
--- a/third_party/immer/extra/guile/scm/detail/subr_wrapper.hpp
+++ /dev/null
@@ -1,111 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#include <scm/detail/invoke.hpp>
-#include <scm/detail/function_args.hpp>
-#include <scm/detail/convert.hpp>
-
-namespace scm {
-namespace detail {
-
-// this anonymous namespace should help avoiding registration clashes
-// among translation units.
-namespace {
-
-template <typename Tag, typename R, typename Fn>
-auto subr_wrapper_impl(Fn fn, pack<R>, pack<>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] () -> SCM { return to_scm(invoke(fn_)); };
-}
-template <typename Tag, typename Fn, typename R, typename T1>
-auto subr_wrapper_impl(Fn fn, pack<R>, pack<T1>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] (SCM a1) -> SCM {
-        return to_scm(invoke(fn_, to_cpp<T1>(a1)));
-    };
-}
-template <typename Tag, typename Fn, typename R, typename T1, typename T2>
-auto subr_wrapper_impl(Fn fn, pack<R>, pack<T1, T2>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] (SCM a1, SCM a2) -> SCM {
-        return to_scm(invoke(fn_, to_cpp<T1>(a1), to_cpp<T2>(a2)));
-    };
-}
-template <typename Tag, typename Fn, typename R, typename T1, typename T2,
-          typename T3>
-auto subr_wrapper_impl(Fn fn, pack<R>, pack<T1, T2, T3>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] (SCM a1, SCM a2, SCM a3) -> SCM {
-        return to_scm(invoke(fn_, to_cpp<T1>(a1), to_cpp<T2>(a2),
-                             to_cpp<T3>(a3)));
-    };
-}
-
-template <typename Tag, typename Fn>
-auto subr_wrapper_impl(Fn fn, pack<void>, pack<>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] () -> SCM { invoke(fn_); return SCM_UNSPECIFIED; };
-}
-template <typename Tag, typename Fn, typename T1>
-auto subr_wrapper_impl(Fn fn, pack<void>, pack<T1>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] (SCM a1) -> SCM {
-        invoke(fn_, to_cpp<T1>(a1)); return SCM_UNSPECIFIED;
-    };
-}
-template <typename Tag, typename Fn, typename T1, typename T2>
-auto subr_wrapper_impl(Fn fn, pack<void>, pack<T1, T2>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] (SCM a1, SCM a2) -> SCM {
-        invoke(fn_, to_cpp<T1>(a1), to_cpp<T2>(a2));
-        return SCM_UNSPECIFIED;
-    };
-}
-template <typename Tag, typename Fn, typename T1, typename T2, typename T3>
-auto subr_wrapper_impl(Fn fn, pack<void>, pack<T1, T2, T3>)
-{
-    check_call_once<Tag, Fn>();
-    static const Fn fn_ = fn;
-    return [] (SCM a1, SCM a2, SCM a3) -> SCM {
-        invoke(fn_, to_cpp<T1>(a1), to_cpp<T2>(a2), to_cpp<T3>(a3));
-        return SCM_UNSPECIFIED;
-    };
-}
-
-template <typename Tag, typename Fn, typename... Args>
-auto subr_wrapper_aux(Fn fn, pack<Args...>)
-{
-    return subr_wrapper_impl<Tag>(
-        fn, pack<std::result_of_t<Fn(Args...)>>{}, pack<Args...>{});
-}
-
-template <typename Tag, typename Fn>
-auto subr_wrapper(Fn fn)
-{
-    return subr_wrapper_aux<Tag>(fn, function_args_t<Fn>{});
-}
-
-} // anonymous namespace
-} // namespace detail
-} // namespace scm
diff --git a/third_party/immer/extra/guile/scm/detail/util.hpp b/third_party/immer/extra/guile/scm/detail/util.hpp
deleted file mode 100644
index fdc323722e99..000000000000
--- a/third_party/immer/extra/guile/scm/detail/util.hpp
+++ /dev/null
@@ -1,49 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#include <libguile.h>
-
-namespace scm {
-namespace detail {
-
-#define SCM_DECLTYPE_RETURN(...)                \
-    decltype(__VA_ARGS__)                       \
-    { return __VA_ARGS__; }                     \
-    /**/
-
-template <typename... Ts>
-constexpr bool is_valid_v = true;
-
-template <typename... Ts>
-using is_valid_t = void;
-
-template <typename... Ts>
-void check_call_once()
-{
-    static bool called = false;
-    if (called) scm_misc_error (nullptr, "Double defined binding. \
-This may be caused because there are multiple C++ binding groups in the same \
-translation unit.  You may solve this by using different type tags for each \
-binding group.", SCM_EOL);
-    called = true;
-}
-
-struct move_sequence
-{
-    move_sequence() = default;
-    move_sequence(const move_sequence&) = delete;
-    move_sequence(move_sequence&& other)
-    { other.moved_from_ = true; };
-
-    bool moved_from_ = false;
-};
-
-} // namespace detail
-} // namespace scm
diff --git a/third_party/immer/extra/guile/scm/group.hpp b/third_party/immer/extra/guile/scm/group.hpp
deleted file mode 100644
index 69cd385820cb..000000000000
--- a/third_party/immer/extra/guile/scm/group.hpp
+++ /dev/null
@@ -1,88 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#include <scm/detail/define.hpp>
-#include <string>
-
-namespace scm {
-namespace detail {
-
-template <typename Tag, int Seq=0>
-struct definer
-{
-    using this_t = definer;
-    using next_t = definer<Tag, Seq + 1>;
-
-    std::string group_name_ = {};
-
-    definer() = default;
-    definer(definer&&) = default;
-
-    template <int Seq2,
-              typename Enable=std::enable_if_t<Seq2 + 1 == Seq>>
-    definer(definer<Tag, Seq2>)
-    {}
-
-    template <typename Fn>
-    next_t define(std::string name, Fn fn) &&
-    {
-        define_impl<this_t>(name, fn);
-        return { std::move(*this) };
-    }
-
-    template <typename Fn>
-    next_t maker(Fn fn) &&
-    {
-        define_impl<this_t>("make", fn);
-        return { std::move(*this) };
-    }
-};
-
-template <typename Tag, int Seq=0>
-struct group_definer
-{
-    using this_t = group_definer;
-    using next_t = group_definer<Tag, Seq + 1>;
-
-    std::string group_name_ = {};
-
-    group_definer(std::string name)
-        : group_name_{std::move(name)} {}
-
-    group_definer(group_definer&&) = default;
-
-    template <int Seq2,
-              typename Enable=std::enable_if_t<Seq2 + 1 == Seq>>
-    group_definer(group_definer<Tag, Seq2>)
-    {}
-
-    template <typename Fn>
-    next_t define(std::string name, Fn fn) &&
-    {
-        define_impl<this_t>(group_name_ + "-" + name, fn);
-        return { std::move(*this) };
-    }
-};
-
-} // namespace detail
-
-template <typename Tag=void>
-detail::definer<Tag> group()
-{
-    return {};
-}
-
-template <typename Tag=void>
-detail::group_definer<Tag> group(std::string name)
-{
-    return { std::move(name) };
-}
-
-} // namespace scm
diff --git a/third_party/immer/extra/guile/scm/list.hpp b/third_party/immer/extra/guile/scm/list.hpp
deleted file mode 100644
index dc162c200244..000000000000
--- a/third_party/immer/extra/guile/scm/list.hpp
+++ /dev/null
@@ -1,54 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#include <scm/val.hpp>
-#include <iostream>
-
-namespace scm {
-
-struct list : detail::wrapper
-{
-    using base_t = detail::wrapper;
-    using base_t::base_t;
-
-    using iterator = list;
-    using value_type = val;
-
-    list() : base_t{SCM_EOL} {};
-    list end() const { return {}; }
-    list begin() const { return *this; }
-
-    explicit operator bool() { return handle_ != SCM_EOL; }
-
-    val operator* () const { return val{scm_car(handle_)}; }
-
-    list& operator++ ()
-    {
-        handle_ = scm_cdr(handle_);
-        return *this;
-    }
-
-    list operator++ (int)
-    {
-        auto result = *this;
-        result.handle_ = scm_cdr(handle_);
-        return result;
-    }
-};
-
-struct args : list
-{
-    using list::list;
-};
-
-} // namespace scm
-
-SCM_DECLARE_WRAPPER_TYPE(scm::list);
-SCM_DECLARE_WRAPPER_TYPE(scm::args);
diff --git a/third_party/immer/extra/guile/scm/scm.hpp b/third_party/immer/extra/guile/scm/scm.hpp
deleted file mode 100644
index f4e4989a44a9..000000000000
--- a/third_party/immer/extra/guile/scm/scm.hpp
+++ /dev/null
@@ -1,14 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#include <scm/val.hpp>
-#include <scm/list.hpp>
-#include <scm/group.hpp>
-#include <scm/type.hpp>
diff --git a/third_party/immer/extra/guile/scm/type.hpp b/third_party/immer/extra/guile/scm/type.hpp
deleted file mode 100644
index da53ed46ef8b..000000000000
--- a/third_party/immer/extra/guile/scm/type.hpp
+++ /dev/null
@@ -1,153 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#include <scm/detail/finalizer_wrapper.hpp>
-#include <scm/detail/define.hpp>
-#include <string>
-
-namespace scm {
-namespace detail {
-
-template <typename T>
-struct foreign_type_storage
-{
-    static SCM data;
-};
-
-template <typename T>
-SCM foreign_type_storage<T>::data = SCM_UNSPECIFIED;
-
-template <typename T>
-struct convert_foreign_type
-{
-    using storage_t = foreign_type_storage<T>;
-    static T& to_cpp(SCM v)
-    {
-        assert(storage_t::data != SCM_UNSPECIFIED &&
-               "can not convert to undefined type");
-        scm_assert_foreign_object_type(storage_t::data, v);
-        return *(T*)scm_foreign_object_ref(v, 0);
-    }
-
-    template <typename U>
-    static SCM to_scm(U&& v)
-    {
-        assert(storage_t::data != SCM_UNSPECIFIED &&
-               "can not convert from undefined type");
-        return scm_make_foreign_object_1(
-            storage_t::data,
-            new (scm_gc_malloc(sizeof(T), "scmpp")) T(
-                std::forward<U>(v)));
-    }
-};
-
-// Assume that every other type is foreign
-template <typename T>
-struct convert<T,
-               std::enable_if_t<!std::is_fundamental<T>::value &&
-                                // only value types are supported at
-                                // the moment but the story might
-                                // change later...
-                                !std::is_pointer<T>::value>>
-    : convert_foreign_type<T>
-{
-};
-
-template <typename Tag, typename T, int Seq=0>
-struct type_definer : move_sequence
-{
-    using this_t = type_definer;
-    using next_t = type_definer<Tag, T, Seq + 1>;
-
-    std::string type_name_ = {};
-    scm_t_struct_finalize finalizer_ = nullptr;
-
-    type_definer(type_definer&&) = default;
-
-    type_definer(std::string type_name)
-        : type_name_(std::move(type_name))
-    {}
-
-    ~type_definer()
-    {
-        if (!moved_from_) {
-            using storage_t = detail::foreign_type_storage<T>;
-            assert(storage_t::data == SCM_UNSPECIFIED);
-            storage_t::data = scm_make_foreign_object_type(
-                scm_from_utf8_symbol(("<" + type_name_ + ">").c_str()),
-                scm_list_1(scm_from_utf8_symbol("data")),
-                finalizer_);
-        }
-    }
-
-    template <int Seq2, typename Enable=std::enable_if_t<Seq2 + 1 == Seq>>
-    type_definer(type_definer<Tag, T, Seq2> r)
-        : move_sequence{std::move(r)}
-        , type_name_{std::move(r.type_name_)}
-        , finalizer_{std::move(r.finalizer_)}
-    {}
-
-    next_t constructor() &&
-    {
-        define_impl<this_t>(type_name_, [] { return T{}; });
-        return { std::move(*this) };
-    }
-
-    template <typename Fn>
-    next_t constructor(Fn fn) &&
-    {
-        define_impl<this_t>(type_name_, fn);
-        return { std::move(*this) };
-    }
-
-    next_t finalizer() &&
-    {
-        finalizer_ = (scm_t_struct_finalize) +finalizer_wrapper<Tag>(
-            [] (T& x) { x.~T(); });
-        return { std::move(*this) };
-    }
-
-    template <typename Fn>
-    next_t finalizer(Fn fn) &&
-    {
-        finalizer_ = (scm_t_struct_finalize) +finalizer_wrapper<Tag>(fn);
-        return { std::move(*this) };
-    }
-
-    next_t maker() &&
-    {
-        define_impl<this_t>("make-" + type_name_, [] { return T{}; });
-        return { std::move(*this) };
-    }
-
-    template <typename Fn>
-    next_t maker(Fn fn) &&
-    {
-        define_impl<this_t>("make-" + type_name_, fn);
-        return { std::move(*this) };
-    }
-
-    template <typename Fn>
-    next_t define(std::string name, Fn fn) &&
-    {
-        define_impl<this_t>(type_name_ + "-" + name, fn);
-        return { std::move(*this) };
-    }
-};
-
-} // namespace detail
-
-template <typename Tag, typename T=Tag>
-detail::type_definer<Tag, T> type(std::string type_name)
-{
-    return { type_name };
-}
-
-} // namespace scm
diff --git a/third_party/immer/extra/guile/scm/val.hpp b/third_party/immer/extra/guile/scm/val.hpp
deleted file mode 100644
index 63d7189262da..000000000000
--- a/third_party/immer/extra/guile/scm/val.hpp
+++ /dev/null
@@ -1,88 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#pragma once
-
-#include <scm/detail/convert.hpp>
-
-namespace scm {
-namespace detail {
-
-template <typename T>
-struct convert_wrapper_type
-{
-    static T to_cpp(SCM v) { return T{v}; }
-    static SCM to_scm(T v) { return v.get(); }
-};
-
-struct wrapper
-{
-    wrapper() = default;
-    wrapper(SCM hdl) : handle_{hdl} {}
-    SCM get() const { return handle_; }
-    operator SCM () const { return handle_; }
-
-    bool operator==(wrapper other) { return handle_ == other.handle_; }
-    bool operator!=(wrapper other) { return handle_ != other.handle_; }
-
-protected:
-    SCM handle_ = SCM_UNSPECIFIED;
-};
-
-} // namespace detail
-
-struct val : detail::wrapper
-{
-    using base_t = detail::wrapper;
-    using base_t::base_t;
-
-    template <typename T,
-              typename = std::enable_if_t<
-                  (!std::is_same<std::decay_t<T>, val>{} &&
-                   !std::is_same<std::decay_t<T>, SCM>{})>>
-    val(T&& x)
-        : base_t(detail::to_scm(std::forward<T>(x)))
-    {}
-
-    template <typename T,
-              typename = std::enable_if_t<
-                  std::is_same<T, decltype(detail::to_cpp<T>(SCM{}))>{}>>
-    operator T() const { return detail::to_cpp<T>(handle_); }
-
-    template <typename T,
-              typename = std::enable_if_t<
-                  std::is_same<T&, decltype(detail::to_cpp<T>(SCM{}))>{}>>
-    operator T& () const { return detail::to_cpp<T>(handle_); }
-
-    template <typename T,
-              typename = std::enable_if_t<
-                  std::is_same<const T&, decltype(detail::to_cpp<T>(SCM{}))>{}>>
-    operator const T& () const { return detail::to_cpp<T>(handle_); }
-
-    val operator() () const
-    { return val{scm_call_0(get())}; }
-    val operator() (val a0) const
-    { return val{scm_call_1(get(), a0)}; }
-    val operator() (val a0, val a1) const
-    { return val{scm_call_2(get(), a0, a1)}; }
-    val operator() (val a0, val a1, val a3) const
-    { return val{scm_call_3(get(), a0, a1, a3)}; }
-};
-
-} // namespace scm
-
-#define SCM_DECLARE_WRAPPER_TYPE(cpp_name__)                            \
-    namespace scm {                                                     \
-    namespace detail {                                                  \
-    template <>                                                         \
-    struct convert<cpp_name__>                                          \
-        : convert_wrapper_type<cpp_name__> {};                          \
-    }} /* namespace scm::detail */                                      \
-    /**/
-
-SCM_DECLARE_WRAPPER_TYPE(val);
diff --git a/third_party/immer/extra/guile/src/immer.cpp b/third_party/immer/extra/guile/src/immer.cpp
deleted file mode 100644
index 7933447a8d18..000000000000
--- a/third_party/immer/extra/guile/src/immer.cpp
+++ /dev/null
@@ -1,153 +0,0 @@
-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-#include <immer/flex_vector.hpp>
-#include <immer/flex_vector_transient.hpp>
-#include <immer/algorithm.hpp>
-#include <scm/scm.hpp>
-#include <iostream>
-
-namespace {
-
-struct guile_heap
-{
-    static void* allocate(std::size_t size)
-    { return scm_gc_malloc(size, "immer"); }
-
-    static void* allocate(std::size_t size, immer::norefs_tag)
-    { return scm_gc_malloc_pointerless(size, "immer"); }
-
-    template <typename ...Tags>
-    static void deallocate(std::size_t size, void* obj, Tags...)
-    { scm_gc_free(obj, size, "immer"); }
-};
-
-using guile_memory = immer::memory_policy<
-    immer::heap_policy<guile_heap>,
-    immer::no_refcount_policy,
-    immer::gc_transience_policy,
-    false>;
-
-template <typename T>
-using guile_ivector = immer::flex_vector<T, guile_memory>;
-
-struct dummy
-{
-    SCM port_ = scm_current_warning_port();
-
-    dummy(dummy&&)
-    { scm_puts("~~ dummy move constructor\n", port_); }
-
-    dummy()
-    { scm_puts("~~ dummy default constructor\n", port_); }
-
-    ~dummy()
-    { scm_puts("~~ dummy finalized\n", port_); }
-
-    void foo()
-    { scm_puts("~~ dummy foo\n", port_); }
-
-    int bar(int x)
-    {
-        auto res = x + 42;
-        scm_puts("~~ dummy bar: ", port_);
-        scm_display(scm::val{res}, port_);
-        scm_newline(port_);
-        return res;
-    }
-};
-
-template <int I>
-void func()
-{
-    auto port = scm_current_warning_port();
-    scm_puts("~~ func", port);
-    scm_display(scm_from_int(I), port);
-    scm_newline(port);
-}
-
-template <typename T = scm::val>
-void init_ivector(std::string type_name = "")
-{
-    using namespace std::string_literals;
-
-    using self_t = guile_ivector<T>;
-    using size_t = typename self_t::size_type;
-
-    auto name = "ivector"s + (type_name.empty() ? ""s : "-" + type_name);
-
-    scm::type<self_t>(name)
-        .constructor([] (scm::args rest) {
-            return self_t(rest.begin(), rest.end());
-        })
-        .maker([] (size_t n, scm::args rest) {
-            return self_t(n, rest ? *rest : scm::val{});
-        })
-        .define("ref", &self_t::operator[])
-        .define("length", &self_t::size)
-        .define("set", [] (const self_t& v, size_t i, scm::val x) {
-            return v.set(i, x);
-        })
-        .define("update", [] (const self_t& v, size_t i, scm::val fn) {
-            return v.update(i, fn);
-        })
-        .define("push", [] (const self_t& v, scm::val x) {
-            return v.push_back(x);
-        })
-        .define("take", [] (const self_t& v, size_t s) {
-            return v.take(s);
-        })
-        .define("drop", [] (const self_t& v, size_t s) {
-            return v.drop(s);
-        })
-        .define("append", [] (self_t v, scm::args rest) {
-            for (auto x : rest)
-                v = v + x;
-            return v;
-        })
-        .define("fold", [] (scm::val fn, scm::val first, const self_t& v) {
-            return immer::accumulate(v, first, fn);
-        })
-        ;
-}
-
-} // anonymous namespace
-
-struct bar_tag_t {};
-
-extern "C"
-void init_immer()
-{
-    scm::type<dummy>("dummy")
-        .constructor()
-        .finalizer()
-        .define("foo", &dummy::foo)
-        .define("bar", &dummy::bar);
-
-    scm::group()
-        .define("func1", func<1>);
-
-    scm::group<bar_tag_t>()
-        .define("func2", func<2>)
-        .define("func3", &dummy::bar);
-
-    scm::group("foo")
-        .define("func1", func<1>);
-
-    init_ivector();
-    init_ivector<std::uint8_t>("u8");
-    init_ivector<std::uint16_t>("u16");
-    init_ivector<std::uint32_t>("u32");
-    init_ivector<std::uint64_t>("u64");
-    init_ivector<std::int8_t>("s8");
-    init_ivector<std::int16_t>("s16");
-    init_ivector<std::int32_t>("s32");
-    init_ivector<std::int64_t>("s64");
-    init_ivector<float>("f32");
-    init_ivector<double>("f64");
-}