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>

2 files changed, 0 insertions, 163 deletions

diff --git a/third_party/immer/test/memory/heaps.cpp b/third_party/immer/test/memory/heaps.cpp
deleted file mode 100644
index 94af2be20868..000000000000
--- a/third_party/immer/test/memory/heaps.cpp
+++ /dev/null
@@ -1,101 +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/heap/cpp_heap.hpp>
-#include <immer/heap/free_list_heap.hpp>
-#include <immer/heap/gc_heap.hpp>
-#include <immer/heap/malloc_heap.hpp>
-#include <immer/heap/thread_local_free_list_heap.hpp>
-
-#include <catch.hpp>
-#include <numeric>
-
-void do_stuff_to(void* buf, std::size_t size)
-{
-    auto ptr = static_cast<unsigned char*>(buf);
-    CHECK(buf != 0);
-    std::iota(ptr, ptr + size, 42);
-}
-
-TEST_CASE("malloc")
-{
-    using heap = immer::malloc_heap;
-
-    SECTION("basic")
-    {
-        auto p = heap::allocate(42u);
-        do_stuff_to(p, 42u);
-        heap::deallocate(42, p);
-    }
-}
-
-TEST_CASE("gc")
-{
-    using heap = immer::gc_heap;
-
-    SECTION("basic")
-    {
-        auto p = heap::allocate(42u);
-        do_stuff_to(p, 42u);
-        heap::deallocate(42, p);
-    }
-}
-
-TEST_CASE("cpp")
-{
-    using heap = immer::cpp_heap;
-
-    SECTION("basic")
-    {
-        auto p = heap::allocate(42u);
-        do_stuff_to(p, 42u);
-        heap::deallocate(42, p);
-    }
-}
-
-template <typename Heap>
-void test_free_list_heap()
-{
-    using heap = Heap;
-
-    SECTION("basic")
-    {
-        auto p = heap::allocate(42u);
-        do_stuff_to(p, 42u);
-        heap::deallocate(42, p);
-    }
-
-    SECTION("reuse")
-    {
-        auto p = heap::allocate(42u);
-        do_stuff_to(p, 42u);
-        heap::deallocate(42, p);
-
-        auto u = heap::allocate(12u);
-        do_stuff_to(u, 12u);
-        heap::deallocate(12, u);
-        CHECK(u == p);
-    }
-}
-
-TEST_CASE("free list")
-{
-    test_free_list_heap<immer::free_list_heap<42u, 2, immer::malloc_heap>>();
-}
-
-TEST_CASE("thread local free list")
-{
-    test_free_list_heap<
-        immer::thread_local_free_list_heap<42u, 2, immer::malloc_heap>>();
-}
-
-TEST_CASE("unsafe free_list")
-{
-    test_free_list_heap<
-        immer::unsafe_free_list_heap<42u, 2, immer::malloc_heap>>();
-}
diff --git a/third_party/immer/test/memory/refcounts.cpp b/third_party/immer/test/memory/refcounts.cpp
deleted file mode 100644
index f9278ca7794e..000000000000
--- a/third_party/immer/test/memory/refcounts.cpp
+++ /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
-//
-
-#include <immer/refcount/no_refcount_policy.hpp>
-#include <immer/refcount/refcount_policy.hpp>
-#include <immer/refcount/unsafe_refcount_policy.hpp>
-
-#include <catch.hpp>
-
-TEST_CASE("no refcount has no data")
-{
-    static_assert(std::is_empty<immer::no_refcount_policy>{}, "");
-}
-
-template <typename RefcountPolicy>
-void test_refcount()
-{
-    using refcount = RefcountPolicy;
-
-    SECTION("starts at one")
-    {
-        refcount elem{};
-        CHECK(elem.dec());
-    }
-
-    SECTION("disowned starts at zero")
-    {
-        refcount elem{immer::disowned{}};
-        elem.inc();
-        CHECK(elem.dec());
-    }
-
-    SECTION("inc dec")
-    {
-        refcount elem{};
-        elem.inc();
-        CHECK(!elem.dec());
-        CHECK(elem.dec());
-    }
-
-    SECTION("inc dec unsafe")
-    {
-        refcount elem{};
-        elem.inc();
-        CHECK(!elem.dec());
-        elem.inc();
-        elem.dec_unsafe();
-        CHECK(elem.dec());
-    }
-}
-
-TEST_CASE("basic refcount") { test_refcount<immer::refcount_policy>(); }
-
-TEST_CASE("thread unsafe refcount")
-{
-    test_refcount<immer::unsafe_refcount_policy>();
-}