https://git.ruby-lang.org/ruby.git/commit/?id=a6cf2f3d22

From a6cf2f3d22a78aeae9d7f36cc78a195deb686705 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Sun, 27 Oct 2019 16:03:07 -0700
Subject: Make mutating the result of SortedSet#to_a not affect the set

Fixes [Bug #15834]

diff --git a/lib/set.rb b/lib/set.rb
index b8ab6ab..d405d81 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -778,7 +778,7 @@ class SortedSet < Set https://github.com/ruby/ruby/blob/trunk/lib/set.rb#L778
 
             def to_a
               (@keys = @hash.keys).sort! unless @keys
-              @keys
+              @keys.dup
             end
 
             def freeze
diff --git a/test/test_set.rb b/test/test_set.rb
index 68ee7ce..86f8602 100644
--- a/test/test_set.rb
+++ b/test/test_set.rb
@@ -800,6 +800,9 @@ class TC_SortedSet < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_set.rb#L800
   def test_sortedset
     s = SortedSet[4,5,3,1,2]
 
+    a = s.to_a
+    assert_equal([1,2,3,4,5], a)
+    a << -1
     assert_equal([1,2,3,4,5], s.to_a)
 
     prev = nil
-- 
cgit v0.10.2


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