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diff --git a/src/catch2/internal/catch_case_insensitive_comparisons.hpp b/src/catch2/internal/catch_case_insensitive_comparisons.hpp
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+++ b/src/catch2/internal/catch_case_insensitive_comparisons.hpp
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+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_CASE_INSENSITIVE_COMPARISONS_HPP_INCLUDED
+#define CATCH_CASE_INSENSITIVE_COMPARISONS_HPP_INCLUDED
+
+#include <catch2/internal/catch_stringref.hpp>
+
+namespace Catch {
+    namespace Detail {
+        //! Provides case-insensitive `op<` semantics when called
+        struct CaseInsensitiveLess {
+            bool operator()( StringRef lhs,
+                             StringRef rhs ) const;
+        };
+
+        //! Provides case-insensitive `op==` semantics when called
+        struct CaseInsensitiveEqualTo {
+            bool operator()( StringRef lhs,
+                             StringRef rhs ) const;
+        };
+
+    } // namespace Detail
+} // namespace Catch
+
+#endif // CATCH_CASE_INSENSITIVE_COMPARISONS_HPP_INCLUDED