1 files changed, 69 insertions, 0 deletions
diff --git a/include/ruby/backward.h b/include/ruby/backward.h
new file mode 100644
index 0000000000..262ed2cef1
--- /dev/null
+++ b/include/ruby/backward.h
@@ -0,0 +1,69 @@
+#ifndef RUBY_RUBY_BACKWARD_H
+#define RUBY_RUBY_BACKWARD_H 1
+
+#define RClass RClassDeprecated
+#ifndef __cplusplus
+DEPRECATED_TYPE(("RClass is internal use only"),
+struct RClass {
+    struct RBasic basic;
+});
+#endif
+
+#define DECLARE_DEPRECATED_FEATURE(ver, func) \
+    NORETURN(ERRORFUNC(("deprecated since "#ver), DEPRECATED(void func(void))))
+
+/* eval.c */
+DECLARE_DEPRECATED_FEATURE(2.2, rb_disable_super);
+DECLARE_DEPRECATED_FEATURE(2.2, rb_enable_super);
+
+/* hash.c */
+DECLARE_DEPRECATED_FEATURE(2.2, rb_hash_iter_lev);
+DECLARE_DEPRECATED_FEATURE(2.2, rb_hash_ifnone);
+
+/* string.c */
+DECLARE_DEPRECATED_FEATURE(2.2, rb_str_associate);
+DECLARE_DEPRECATED_FEATURE(2.2, rb_str_associated);
+
+/* variable.c */
+DEPRECATED(void rb_autoload(VALUE, ID, const char*));
+
+/* vm.c */
+DECLARE_DEPRECATED_FEATURE(2.2, rb_clear_cache);
+DECLARE_DEPRECATED_FEATURE(2.2, rb_frame_pop);
+
+#define DECLARE_DEPRECATED_INTERNAL_FEATURE(func) \
+    NORETURN(ERRORFUNC(("deprecated internal function"), DEPRECATED(void func(void))))
+
+/* eval.c */
+NORETURN(ERRORFUNC(("internal function"), void rb_frozen_class_p(VALUE)));
+
+/* error.c */
+DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_compile_error);
+DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_compile_error_with_enc);
+DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_compile_error_append);
+
+/* struct.c */
+DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_struct_ptr);
+
+/* variable.c */
+DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_generic_ivar_table);
+NORETURN(ERRORFUNC(("internal function"), VALUE rb_mod_const_missing(VALUE, VALUE)));
+
+/* from version.c */
+#ifndef RUBY_SHOW_COPYRIGHT_TO_DIE
+# define RUBY_SHOW_COPYRIGHT_TO_DIE 1
+#endif
+#if RUBY_SHOW_COPYRIGHT_TO_DIE
+/* for source code backward compatibility */
+DEPRECATED(static inline int ruby_show_copyright_to_die(int));
+static inline int
+ruby_show_copyright_to_die(int exitcode)
+{
+    ruby_show_copyright();
+    return exitcode;
+}
+#define ruby_show_copyright() /* defer EXIT_SUCCESS */ \
+    (exit(ruby_show_copyright_to_die(EXIT_SUCCESS)))
+#endif
+
+#endif /* RUBY_RUBY_BACKWARD_H */