usa	2019-01-31 19:58:49 +0900 (Thu, 31 Jan 2019)

  New Revision: 66966

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66966

  Log:
    merge revision(s) 66756: [Backport #15479]
    
    Mark array as "going to be modified" in `Array#reject!`
    
    Before this patch, if `reject!` is called on a shared array it can
    mutate the shared array rather than a copy.  This patch marks the array
    as "going to be modified" so that the shared source array isn't
    mutated.
    
    [Bug #15479] [ruby-core:90781]

  Modified directories:
    branches/ruby_2_4/
  Modified files:
    branches/ruby_2_4/array.c
    branches/ruby_2_4/test/ruby/test_array.rb
    branches/ruby_2_4/version.h
Index: ruby_2_4/version.h
===================================================================
--- ruby_2_4/version.h	(revision 66965)
+++ ruby_2_4/version.h	(revision 66966)
@@ -1,6 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/ruby_2_4/version.h#L1
 #define RUBY_VERSION "2.4.6"
 #define RUBY_RELEASE_DATE "2019-01-31"
-#define RUBY_PATCHLEVEL 341
+#define RUBY_PATCHLEVEL 342
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 1
Index: ruby_2_4/test/ruby/test_array.rb
===================================================================
--- ruby_2_4/test/ruby/test_array.rb	(revision 66965)
+++ ruby_2_4/test/ruby/test_array.rb	(revision 66966)
@@ -1250,6 +1250,65 @@ class TestArray < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/ruby_2_4/test/ruby/test_array.rb#L1250
     assert_equal(@cls[7, 8, 9, 10], a, bug2545)
   end
 
+  def test_shared_array_reject!
+    c = []
+    b = [1, 2, 3, 4]
+    3.times do
+      a = b.dup
+      c << a.dup
+
+      begin
+        a.reject! do |x|
+          case x
+          when 2 then true
+          when 3 then raise StandardError, 'Oops'
+          else false
+          end
+        end
+      rescue StandardError
+      end
+
+      c << a.dup
+    end
+
+    bug90781 = '[ruby-core:90781]'
+    assert_equal [[1, 2, 3, 4],
+                  [1, 3, 4],
+                  [1, 2, 3, 4],
+                  [1, 3, 4],
+                  [1, 2, 3, 4],
+                  [1, 3, 4]], c, bug90781
+  end
+
+  def test_iseq_shared_array_reject!
+    c = []
+    3.times do
+      a = [1, 2, 3, 4]
+      c << a.dup
+
+      begin
+        a.reject! do |x|
+          case x
+          when 2 then true
+          when 3 then raise StandardError, 'Oops'
+          else false
+          end
+        end
+      rescue StandardError
+      end
+
+      c << a.dup
+    end
+
+    bug90781 = '[ruby-core:90781]'
+    assert_equal [[1, 2, 3, 4],
+                  [1, 3, 4],
+                  [1, 2, 3, 4],
+                  [1, 3, 4],
+                  [1, 2, 3, 4],
+                  [1, 3, 4]], c, bug90781
+  end
+
   def test_replace
     a = @cls[ 1, 2, 3]
     a_id = a.__id__
Index: ruby_2_4/array.c
===================================================================
--- ruby_2_4/array.c	(revision 66965)
+++ ruby_2_4/array.c	(revision 66966)
@@ -3218,6 +3218,7 @@ static VALUE https://github.com/ruby/ruby/blob/trunk/ruby_2_4/array.c#L3218
 rb_ary_reject_bang(VALUE ary)
 {
     RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
+    rb_ary_modify(ary);
     return ary_reject_bang(ary);
 }
 
Index: ruby_2_4
===================================================================
--- ruby_2_4	(revision 66965)
+++ ruby_2_4	(revision 66966)

Property changes on: ruby_2_4
___________________________________________________________________
Modified: svn:mergeinfo
## -0,0 +0,1 ##
   Merged /trunk:r66756

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