1 files changed, 42 insertions, 0 deletions
diff --git a/third_party/immer/test/map/issue-56.cpp b/third_party/immer/test/map/issue-56.cpp
new file mode 100644
index 0000000000..447c623dda
--- /dev/null
+++ b/third_party/immer/test/map/issue-56.cpp
@@ -0,0 +1,42 @@
+//
+// 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
+//
+
+// Thanks @dgel for reporting this issue
+// https://github.com/arximboldi/immer/issues/56
+
+#include <immer/flex_vector.hpp>
+#include <immer/map.hpp>
+#include <immer/vector.hpp>
+
+#include <catch.hpp>
+
+TEST_CASE("const map")
+{
+    const auto x = immer::map<std::string, int>{}.set("A", 1);
+    auto it      = x.begin();
+    CHECK(it->first == "A");
+    CHECK(it->second == 1);
+}
+
+TEST_CASE("const vector")
+{
+    const auto x =
+        immer::vector<std::pair<std::string, int>>{}.push_back({"A", 1});
+    auto it = x.begin();
+    CHECK(it->first == "A");
+    CHECK(it->second == 1);
+}
+
+TEST_CASE("const flex vector")
+{
+    const auto x =
+        immer::flex_vector<std::pair<std::string, int>>{}.push_back({"A", 1});
+    auto it = x.begin();
+    CHECK(it->first == "A");
+    CHECK(it->second == 1);
+}