From e6a260ecdbe57d14ae01e6c03977775af574b132 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 9 Sep 2016 03:02:22 +0000
Subject: variable.c: rb_deprecate_constant

* variable.c (rb_deprecate_constant): new function to deprecate a
  constant by the name.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56119 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 internal.h |  1 +
 variable.c | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/internal.h b/internal.h
index f9bc693e0f..bf3880e695 100644
--- a/internal.h
+++ b/internal.h
@@ -1498,6 +1498,7 @@ VALUE rb_search_class_path(VALUE);
 VALUE rb_attr_delete(VALUE, ID);
 VALUE rb_ivar_lookup(VALUE obj, ID id, VALUE undef);
 void rb_autoload_str(VALUE mod, ID id, VALUE file);
+void rb_deprecate_constant(VALUE mod, const char *name);
 
 /* version.c */
 extern const char ruby_engine[];
diff --git a/variable.c b/variable.c
index 2465212ab9..e9245050d3 100644
--- a/variable.c
+++ b/variable.c
@@ -2732,6 +2732,22 @@ set_const_visibility(VALUE mod, int argc, const VALUE *argv,
     rb_clear_constant_cache();
 }
 
+void
+rb_deprecate_constant(VALUE mod, const char *name)
+{
+    rb_const_entry_t *ce;
+    ID id;
+    long len = strlen(name);
+
+    rb_frozen_class_p(mod);
+    if (!(id = rb_check_id_cstr(name, len, NULL)) ||
+	!(ce = rb_const_lookup(mod, id))) {
+	rb_name_err_raise("constant %2$s::%1$s not defined",
+			  mod, rb_fstring_new(name, len));
+    }
+    ce->flag |= CONST_DEPRECATED;
+}
+
 /*
  *  call-seq:
  *     mod.private_constant(symbol, ...)    => mod
-- 
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