object.c: use converted string

* object.c (rb_convert_to_integer): should not drop the converted
  string.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56495 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Oct 27 09:12:32 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* object.c (rb_convert_to_integer): should not drop the converted
+	  string.
+
 Wed Oct 26 17:09:59 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (rb_intern): use prefixed version macro

object.c

@@ -2699,7 +2699,6 @@ rb_convert_to_integer(VALUE val, int base)
 	return val;
 
       case T_STRING:
-      string_conv:
 	return rb_str_to_inum(val, base, TRUE);
 
       case T_NIL:
@@ -2712,7 +2711,7 @@ rb_convert_to_integer(VALUE val, int base)
     }
     if (base != 0) {
 	tmp = rb_check_string_type(val);
-	if (!NIL_P(tmp)) goto string_conv;
+	if (!NIL_P(tmp)) return rb_str_to_inum(tmp, base, TRUE);
       arg_error:
 	rb_raise(rb_eArgError, "base specified for non string value");
     }

test/ruby/test_integer.rb

@@ -100,6 +100,10 @@ class TestInteger < Test::Unit::TestCase
     assert_raise(Encoding::CompatibilityError, bug6192) {Integer("0".encode("iso-2022-jp"))}
 
     assert_raise_with_message(ArgumentError, /\u{1f4a1}/) {Integer("\u{1f4a1}")}
+
+    obj = Struct.new(:s).new(%w[42 not-an-integer])
+    def obj.to_str; s.shift; end
+    assert_equal(42, Integer(obj, 10))
   end
 
   def test_int_p