https://git.ruby-lang.org/ruby.git/commit/?id=fce54a5404

From fce54a5404139a77bd0b7d6f82901083fcb16f1e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 16 Jan 2020 15:36:38 +0900
Subject: Fix `String#partition`

Split with the matched part when the separator matches the empty
part at the beginning.  [Bug #11014]

diff --git a/string.c b/string.c
index 2413fbf..ca425e9 100644
--- a/string.c
+++ b/string.c
@@ -9795,7 +9795,6 @@ rb_str_partition(VALUE str, VALUE sep) https://github.com/ruby/ruby/blob/trunk/string.c#L9795
 	    return rb_ary_new3(3, rb_str_dup(str), str_new_empty(str), str_new_empty(str));
 	}
 	sep = rb_str_subpat(str, sep, INT2FIX(0));
-	if (pos == 0 && RSTRING_LEN(sep) == 0) goto failed;
     }
     else {
 	pos = rb_str_index(str, sep, 0);
diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index 09d099b..f0b7653 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -2567,6 +2567,8 @@ CODE https://github.com/ruby/ruby/blob/trunk/test/ruby/test_string.rb#L2567
     hello = "hello"
     hello.partition("hi").map(&:upcase!)
     assert_equal("hello", hello, bug)
+
+    assert_equal(["", "", "foo"], "foo".partition(/^=*/))
   end
 
   def test_rpartition
-- 
cgit v0.10.2


--
ML: ruby-changes@q...
Info: http://www.atdot.net/~ko1/quickml/