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diff --git a/gcc/diagnostics/changes.h b/gcc/diagnostics/changes.h
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+/* Determining the results of applying fix-it hints.
+   Copyright (C) 2016-2025 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_DIAGNOSTICS_CHANGES_H
+#define GCC_DIAGNOSTICS_CHANGES_H
+
+#include "typed-splay-tree.h"
+
+class fixit_hint;
+
+namespace diagnostics {
+namespace changes {
+
+class change_set;
+class changed_file;
+
+/* A set of changes to the source code.
+
+   The changes are "atomic" - if any changes can't be applied,
+   none of them can be (tracked by the m_valid flag).
+   Similarly, attempts to add the changes from a rich_location flagged
+   as containing invalid changes mean that the whole of the change_set
+   is flagged as invalid.
+
+   A complication here is that fix-its are expressed relative to coordinates
+   in the files when they were parsed, before any changes have been made, and
+   so if there's more that one fix-it to be applied, we have to adjust
+   later fix-its to allow for the changes made by earlier ones.  This
+   is done by the various "get_effective_column" methods.  */
+
+class change_set
+{
+ public:
+  change_set (file_cache &);
+
+  bool valid_p () const { return m_valid; }
+
+  void add_fixits (rich_location *richloc);
+
+  char *get_content (const char *filename);
+
+  int get_effective_column (const char *filename, int line, int column);
+
+  char *generate_diff (bool show_filenames);
+  void print_diff (pretty_printer *pp, bool show_filenames);
+
+  file_cache &get_file_cache () const { return m_file_cache; }
+
+ private:
+  bool apply_fixit (const fixit_hint *hint);
+  changed_file *get_file (const char *filename);
+  changed_file &get_or_insert_file (const char *filename);
+
+  file_cache &m_file_cache;
+  bool m_valid;
+  typed_splay_tree<const char *, changed_file *> m_files;
+};
+
+} // namespace diagnostics::changes
+} // namespace diagnostics
+
+#endif /* GCC_DIAGNOSTICS_CHANGES_H.  */