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diff --git a/src/third-party/scnlib/include/scn/detail/fwd.h b/src/third-party/scnlib/include/scn/detail/fwd.h
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+++ b/src/third-party/scnlib/include/scn/detail/fwd.h
@@ -0,0 +1,204 @@
+// Copyright 2017 Elias Kosunen
+//
+// 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
+//
+//     https://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.
+//
+// This file is a part of scnlib:
+//     https://github.com/eliaskosunen/scnlib
+
+#ifndef SCN_DETAIL_FWD_H
+#define SCN_DETAIL_FWD_H
+
+#include "config.h"
+
+#include <cstddef>
+
+namespace scn {
+    SCN_BEGIN_NAMESPACE
+
+    // args.h
+
+    template <typename CharT>
+    class basic_arg;
+    template <typename CharT>
+    class basic_args;
+    template <typename CharT, typename... Args>
+    class arg_store;
+
+    template <typename T>
+    struct temporary;
+
+    // error.h
+
+    class error;
+
+    // locale.h
+
+    template <typename CharT>
+    class basic_locale_ref;
+
+    // context.h
+
+    template <typename WrappedRange>
+    class basic_context;
+
+    // parse_context.h
+
+    template <typename CharT>
+    class basic_parse_context;
+    template <typename CharT>
+    class basic_empty_parse_context;
+
+    namespace detail {
+        template <typename T>
+        struct parse_context_template_for_format;
+    }
+
+    // reader/common.h
+
+    template <typename T, typename Enable = void>
+    struct scanner;
+
+    // defined here to avoid including <scn.h> if the user wants to create a
+    // scanner for their own type
+    /**
+     * Base class for all scanners.
+     * User-defined scanner must derive from this type.
+     */
+    struct parser_base {
+        /**
+         * Returns `true` if `skip_range_whitespace()` is to be called before
+         * scanning this value.
+         *
+         * Defaults to `true`. Is `false` for chars, code points and strings
+         * when using set scanning.
+         */
+        static constexpr bool skip_preceding_whitespace()
+        {
+            return true;
+        }
+        /**
+         * Returns `true` if this scanner supports parsing align and fill
+         * specifiers from the format string, and then scanning them.
+         *
+         * Defaults to `false`, `true` for all scnlib-defined scanners.
+         */
+        static constexpr bool support_align_and_fill()
+        {
+            return false;
+        }
+
+        static SCN_CONSTEXPR14 void make_localized() {}
+    };
+
+    struct empty_parser;
+    struct common_parser;
+    struct common_parser_default;
+
+    namespace detail {
+        template <typename T>
+        struct simple_integer_scanner;
+    }
+
+    // visitor.h
+
+    template <typename Context, typename ParseCtx>
+    class basic_visitor;
+
+    // file.h
+
+    template <typename CharT>
+    class basic_mapped_file;
+    template <typename CharT>
+    class basic_file;
+    template <typename CharT>
+    class basic_owning_file;
+
+    // scan.h
+
+    template <typename T>
+    struct span_list_wrapper;
+    template <typename T>
+    struct discard_type;
+
+    // util/array.h
+
+    namespace detail {
+        template <typename T, std::size_t N>
+        struct array;
+    }
+
+    // util/expected.h
+
+    template <typename T, typename Error = ::scn::error, typename Enable = void>
+    class expected;
+
+    // util/memory.h
+
+    namespace detail {
+        template <typename T>
+        struct pointer_traits;
+
+        template <typename T>
+        class erased_storage;
+
+    }  // namespace detail
+
+    // util/optional.h
+
+    template <typename T>
+    class optional;
+
+    // util/small_vector.h
+
+    namespace detail {
+        template <typename T, size_t StackN>
+        class small_vector;
+    }
+
+    // util/span.h
+
+    template <typename T>
+    class span;
+
+    // util/string_view.h
+
+    template <typename CharT>
+    class basic_string_view;
+
+    // util/unique_ptr.h
+
+    namespace detail {
+        template <typename T>
+        class unique_ptr;
+    }
+
+    // for SCN_MOVE
+    namespace detail {
+        template <typename T>
+        struct remove_reference {
+            using type = T;
+        };
+        template <typename T>
+        struct remove_reference<T&> {
+            using type = T;
+        };
+        template <typename T>
+        struct remove_reference<T&&> {
+            using type = T;
+        };
+    }  // namespace detail
+
+    SCN_END_NAMESPACE
+}  // namespace scn
+
+#endif  // SCN_DETAIL_FWD_H