Test concepts formatting

src/passes/GlobalEffects.cpp

diff --git a/src/passes/GlobalEffects.cpp b/src/passes/GlobalEffects.cpp
index 7f47cf1..41e1dff 100644
--- a/src/passes/GlobalEffects.cpp
+++ b/src/passes/GlobalEffects.cpp
@@ -22,6 +22,7 @@
 #include "ir/effects.h"
 #include "ir/module-utils.h"
 #include "pass.h"
+#include "support/graph_traversal.h"
 #include "support/strongly_connected_components.h"
 #include "wasm.h"
 

src/support/graph_traversal.h

diff --git a/src/support/graph_traversal.h b/src/support/graph_traversal.h
new file mode 100644
index 0000000..7da0f78
--- /dev/null
+++ b/src/support/graph_traversal.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2026 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <concepts>
+#include <functional>
+#include <iterator>
+#include <unordered_set>
+
+namespace wasm {
+
+template<typename T, typename SuccessorFunction>
+  requires std::
+    invocable<SuccessorFunction, std::function<void(const T&)>&, const T&>
+  class Graph {
+public:
+  template<std::input_iterator It, std::sentinel_for<It> Sen>
+    requires std::convertible_to<std::iter_reference_t<It>, T>
+  Graph(It rootsBegin, Sen rootsEnd, auto&& successors)
+    : roots(rootsBegin, rootsEnd),
+      successors(std::forward<decltype(successors)>(successors)) {}
+
+  // Traverse the graph depth-first, calling `successors` exactly once for each
+  // node (unless the node appears multiple times in `roots`). Return the set of
+  // nodes visited.
+  std::unordered_set<T> traverseDepthFirst() const {
+    std::vector<T> stack(roots.begin(), roots.end());
+    std::unordered_set<T> visited(roots.begin(), roots.end());
+
+    while (!stack.empty()) {
+      auto curr = std::move(stack.back());
+      stack.pop_back();
+
+      auto maybePush = [&](const T& t) {
+        if (visited.contains(t)) {
+          return;
+        }
+
+        visited.insert(t);
+        stack.push_back(t);
+      };
+
+      successors(maybePush, curr);
+    }
+
+    return visited;
+  }
+
+private:
+  std::vector<T> roots;
+  SuccessorFunction successors;
+};
+
+template<std::input_iterator It,
+         std::sentinel_for<It> Sen,
+         typename SuccessorFunction>
+Graph(It, Sen, SuccessorFunction)
+  -> Graph<std::iter_value_t<It>, std::decay_t<SuccessorFunction>>;
+
+} // namespace wasm