Squashed 'third_party/immer/' content from commit ad3e3556d

git-subtree-dir: third_party/immer
git-subtree-split: ad3e3556d38bb75966dd24c61a774970a7c7957e

test/map/B3.cpp

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+//
+// 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/map.hpp>
+
+template <typename K,
+          typename T,
+          typename Hash = std::hash<K>,
+          typename Eq   = std::equal_to<K>>
+using test_map_t = immer::map<K, T, Hash, Eq, immer::default_memory_policy, 3u>;
+
+#define MAP_T test_map_t
+#include "generic.ipp"