4 files changed, 43 insertions, 1 deletions
diff --git a/test/app.hpp b/test/app.hpp
index c77c3369..44fbed11 100644
--- a/test/app.hpp
+++ b/test/app.hpp
@@ -8,5 +8,6 @@ struct app final : Platform::WindowlessWglApplication // NOLINT(cppcoreguideline
     ~app();
     int exec() override;
     static bool test_json();
+    static bool test_tile_iter();
 };
 } // namespace Magnum::Examples
diff --git a/test/json.cpp b/test/json.cpp
index 3ce3c9d0..46bdf528 100644
--- a/test/json.cpp
+++ b/test/json.cpp
@@ -18,7 +18,7 @@ static chunk make_test_chunk()
          metal3 = loader.tile_atlas("share/game/images/metal3.tga", {2, 2});
     constexpr auto N = TILE_MAX_DIM;
     chunk c;
-    for (auto [x, k, pt] : c) {
+    for (auto& [x, k, pt] : c) {
         const auto& atlas = pt.x > N/2 && pt.y >= N/2 ? metal1 : metal2;
         x.ground_image = { atlas, (std::uint8_t)(k % atlas->num_tiles().product()) };
     }
@@ -52,6 +52,7 @@ bool app::test_json() // NOLINT(readability-convert-member-functions-to-static)
         const auto chunk = make_test_chunk();
         ret &= json_helper::to_json(chunk, output_dir/"zzz_chunk-1.json");
     }
+
     return ret;
 }
 
diff --git a/test/main.cpp b/test/main.cpp
index d190c27b..06a2e64d 100644
--- a/test/main.cpp
+++ b/test/main.cpp
@@ -25,6 +25,7 @@ int app::exec()
 {
     bool ret = true;
     ret &= test_json();
+    ret &= test_tile_iter();
     return !ret;
 }
 
diff --git a/test/tile-iter.cpp b/test/tile-iter.cpp
new file mode 100644
index 00000000..aea6b8b5
--- /dev/null
+++ b/test/tile-iter.cpp
@@ -0,0 +1,39 @@
+#include "app.hpp"
+#include "chunk.hpp"
+namespace Magnum::Examples {
+
+static inline bool always_false()
+{
+    volatile bool ret = false;
+    return ret;
+}
+
+bool app::test_tile_iter() // NOLINT(readability-function-size)
+{
+    if (always_false())
+    {
+        const chunk c;
+        for (const auto& [x, k, pt] : c)
+            static_assert(std::is_same_v<decltype(x), const tile&>);
+        for (auto& [x, k, pt] : c)
+            static_assert(std::is_same_v<decltype(x), const tile&>);
+        for (auto [x, k, pt] : c)
+            static_assert(std::is_same_v<decltype(x), const tile&>);
+    }
+    if (always_false())
+    {
+        chunk c;
+        for (auto& [x, k, pt] : c)
+            static_assert(std::is_same_v<decltype(x), tile&>);
+        for (const auto& [x, k, pt] : c)
+            static_assert(std::is_same_v<decltype(x), const tile&>);
+#if 1
+        for (auto [x, k, pt] : c)
+            static_assert(std::is_same_v<decltype(x), tile&>);
+#endif
+    }
+    return true;
+}
+
+} // namespace Magnum::Examples
+