From fd89be255f73f2cf3de35c3af4771d8ccb19ae0d Mon Sep 17 00:00:00 2001
From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 11 Mar 2017 14:48:04 +0000
Subject: merge revision(s) 57278,57279: [Backport #12855]

	fix optimization for hash aset/aref with fstring

	Patch by Eric Wong [ruby-core:78797].
	I don't like the idea of making insns.def any bigger to support
	a corner case, and "test_hash_aref_fstring_identity" shows
	how contrived this is.

	[ruby-core:78783] [Bug #12855]
	adjust indent [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@57848 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_hash.rb | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'test')

diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index b79f9aa0cc..040d25e144 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -237,6 +237,19 @@ class TestHash < Test::Unit::TestCase
     assert_same a.keys[0], b.keys[0]
   end
 
+  def test_hash_aset_fstring_identity
+    h = {}.compare_by_identity
+    h['abc'] = 1
+    h['abc'] = 2
+    assert_equal 2, h.size, '[ruby-core:78783] [Bug #12855]'
+  end
+
+  def test_hash_aref_fstring_identity
+    h = {}.compare_by_identity
+    h['abc'] = 1
+    assert_nil h['abc'], '[ruby-core:78783] [Bug #12855]'
+  end
+
   def test_NEWHASH_fstring_key
     a = {"ABC" => :t}
     b = {"ABC" => :t}
-- 
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