String#rindex should no longer take integer argument

src/string.c

@@ -1725,16 +1725,6 @@ mrb_str_rindex_m(mrb_state *mrb, mrb_value str)
   mrb_regexp_check(mrb, sub);
 
   switch (mrb_type(sub)) {
-    case MRB_TT_FIXNUM: {
-      mrb_int c = mrb_fixnum(sub);
-      unsigned char *p = (unsigned char*)RSTRING_PTR(str);
-
-      for (pos=len-1;pos>=0;pos--) {
-        if (p[pos] == c) return mrb_fixnum_value(pos);
-      }
-      return mrb_nil_value();
-    }
-
     default: {
       mrb_value tmp;
 

test/t/string.rb

@@ -424,9 +424,6 @@ assert('String#rindex', '15.2.10.5.31') do
   assert_nil 'abc'.rindex('d')
   assert_equal 0, 'abcabc'.rindex('a', 1)
   assert_equal 3, 'abcabc'.rindex('a', 4)
-
-  assert_equal 3,   'abcabc'.rindex(97)
-  assert_equal nil, 'abcabc'.rindex(0)
 end
 
 # 'String#scan', '15.2.10.5.32' will be tested in mrbgems.