Made the warning for deprecated constants follow the category flag

error.c

@@ -129,32 +129,38 @@ rb_syntax_error_append(VALUE exc, VALUE file, int line, int column,
 }
 
 static unsigned int warning_disabled_categories;
-#define RB_WARN_CATEGORY_DEPRECATED 1
 
 static unsigned int
 rb_warning_category_mask(VALUE category)
 {
-    unsigned int mask = 0;
+    return 1U << rb_warning_category_from_name(category);
+}
+
+rb_warning_category_t
+rb_warning_category_from_name(VALUE category)
+{
+    rb_warning_category_t cat = RB_WARN_CATEGORY_NONE;
     Check_Type(category, T_SYMBOL);
     if (category == ID2SYM(rb_intern("deprecated"))) {
-        mask = RB_WARN_CATEGORY_DEPRECATED;
+        cat = RB_WARN_CATEGORY_DEPRECATED;
     }
     else {
         rb_raise(rb_eArgError, "unknown category: %"PRIsVALUE, category);
     }
-    return mask;
+    return cat;
 }
 
-static int
-rb_warning_category_enabled_p(VALUE category)
+MJIT_FUNC_EXPORTED bool
+rb_warning_category_enabled_p(rb_warning_category_t category)
 {
-    return !(warning_disabled_categories & rb_warning_category_mask(category));
+    return !(warning_disabled_categories & (1U << category));
 }
 
 static VALUE
 rb_warning_s_aref(VALUE mod, VALUE category)
 {
-    if (rb_warning_category_enabled_p(category))
+    rb_warning_category_t cat = rb_warning_category_from_name(category);
+    if (rb_warning_category_enabled_p(cat))
         return Qtrue;
     return Qfalse;
 }

internal.h

@@ -1554,6 +1554,13 @@ PRINTF_ARGS(void rb_sys_enc_warning(rb_encoding *enc, const char *fmt, ...), 2,
 PRINTF_ARGS(void rb_syserr_enc_warning(int err, rb_encoding *enc, const char *fmt, ...), 3, 4);
 #endif
 
+typedef enum {
+    RB_WARN_CATEGORY_NONE,
+    RB_WARN_CATEGORY_DEPRECATED,
+} rb_warning_category_t;
+rb_warning_category_t rb_warning_category_from_name(VALUE category);
+bool rb_warning_category_enabled_p(rb_warning_category_t category);
+
 #define rb_raise_cstr(etype, mesg) \
     rb_exc_raise(rb_exc_new_str(etype, rb_str_new_cstr(mesg)))
 #define rb_raise_static(etype, mesg) \

test/ruby/test_module.rb

@@ -28,10 +28,13 @@ class TestModule < Test::Unit::TestCase
   def setup
     @verbose = $VERBOSE
     $VERBOSE = nil
+    @deprecated = Warning[:deprecated]
+    Warning[:deprecated] = true
   end
 
   def teardown
     $VERBOSE = @verbose
+    Warning[:deprecated] = @deprecated
   end
 
   def test_LT_0
@@ -1580,6 +1583,8 @@ class TestModule < Test::Unit::TestCase
     assert_warn(/#{c}::FOO is deprecated/) {Class.new(c)::FOO}
     bug12382 = '[ruby-core:75505] [Bug #12382]'
     assert_warn(/deprecated/, bug12382) {c.class_eval "FOO"}
+    Warning[:deprecated] = false
+    assert_warn('') {c::FOO}
   end
 
   NIL = nil

variable.c

@@ -2302,7 +2302,8 @@ rb_autoload_at_p(VALUE mod, ID id, int recur)
 MJIT_FUNC_EXPORTED void
 rb_const_warn_if_deprecated(const rb_const_entry_t *ce, VALUE klass, ID id)
 {
-    if (RB_CONST_DEPRECATED_P(ce)) {
+    if (RB_CONST_DEPRECATED_P(ce) &&
+        rb_warning_category_enabled_p(RB_WARN_CATEGORY_DEPRECATED)) {
 	if (klass == rb_cObject) {
 	    rb_warn("constant ::%"PRIsVALUE" is deprecated", QUOTE_ID(id));
 	}