[ruby/strscan] Deprecate constant Id

`$Id$` is for RCS, CVS, and SVN; no information with GIT.

ruby/strscan@9e3db14fa2

Author: nobu

ext/strscan/strscan.c

@@ -2233,6 +2233,7 @@ Init_strscan(void)
     tmp = rb_str_new2("$Id$");
     rb_obj_freeze(tmp);
     rb_const_set(StringScanner, rb_intern("Id"), tmp);
+    rb_deprecate_constant(StringScanner, "Id");
 
     rb_define_alloc_func(StringScanner, strscan_s_allocate);
     rb_define_private_method(StringScanner, "initialize", strscan_initialize, -1);

test/strscan/test_stringscanner.rb

@@ -107,11 +107,6 @@ def test_const_Version
     assert_equal(true, StringScanner::Version.frozen?)
   end
 
-  def test_const_Id
-    assert_instance_of(String, StringScanner::Id)
-    assert_equal(true, StringScanner::Id.frozen?)
-  end
-
   def test_inspect
     str = 'test string'.dup
     s = create_string_scanner(str, false)