merges r24761 and r24999 from trunk into ruby_1_9_1.

--
* compile.c (iseq_compile_each): op_asgn to aref should return rhs.
  [ruby-core:25387]
--
* compile.c (iseq_compile_each), parse.y (stmt, arg): arg_concat()
  on op_asgn was inversed.  [ruby-core:25629] [Bug #2050]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1@25940 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 33 insertions, 0 deletions

diff --git a/test/ruby/test_assignment.rb b/test/ruby/test_assignment.rb
index b82cee81d..e38b20b28 100644
--- a/test/ruby/test_assignment.rb
+++ b/test/ruby/test_assignment.rb
@@ -77,6 +77,14 @@ class TestAssignment < Test::Unit::TestCase
     a,b,*c = *[*[]]; assert_equal([nil,nil,[]], [a,b,c])
     a,b,*c = *[*[1]]; assert_equal([1,nil,[]], [a,b,c])
     a,b,*c = *[*[1,2]]; assert_equal([1,2,[]], [a,b,c])
+
+    bug2050 = '[ruby-core:25629]'
+    a = Hash.new {[]}
+    b = [1, 2]
+    assert_equal([1, 2, 3], a[:x] += [*b, 3], bug2050)
+    assert_equal([1, 2, 3], a[:x], bug2050)
+    assert_equal([1, 2, 3, [1, 2, 3]], a[:x] <<= [*b, 3], bug2050)
+    assert_equal([1, 2, 3, [1, 2, 3]], a[:x], bug2050)
   end
 
   def test_yield
diff --git a/test/ruby/test_basicinstructions.rb b/test/ruby/test_basicinstructions.rb
index 90b034a90..eab9afc50 100644
--- a/test/ruby/test_basicinstructions.rb
+++ b/test/ruby/test_basicinstructions.rb
@@ -505,6 +505,14 @@ class TestBasicInstructions < Test::Unit::TestCase
       :Bug1996
     end
     Bug1996 = '[ruby-dev:39163], [ruby-core:25143]'
+    def [](i)
+      @x
+    end
+    def []=(i, x)
+      @x = x
+      :Bug2050
+    end
+    Bug2050 = '[ruby-core:25387]'
   end
 
   def test_opassign2_1
@@ -575,6 +583,23 @@ class TestBasicInstructions < Test::Unit::TestCase
     assert_equal 4, a[0]
   end
 
+  def test_opassign1_2
+    x = OP.new
+    x[0] = nil
+    assert_equal 1, x[0] ||= 1, OP::Bug2050
+    assert_equal 1, x[0]
+    assert_equal 2, x[0] &&= 2, OP::Bug2050
+    assert_equal 2, x[0]
+    assert_equal 2, x[0] ||= 3, OP::Bug2050
+    assert_equal 2, x[0]
+    assert_equal 4, x[0] &&= 4, OP::Bug2050
+    assert_equal 4, x[0]
+    assert_equal 5, x[0] += 1, OP::Bug2050
+    assert_equal 5, x[0]
+    assert_equal 4, x[0] -= 1, OP::Bug2050
+    assert_equal 4, x[0]
+  end
+
   def test_backref
     /re/ =~ 'not match'
     assert_nil $~