From bbad46092aeb8c6c6cf3d51ceb6f4643f9550040 Mon Sep 17 00:00:00 2001
From: DoDaek <dbxor8960@naver.com>
Date: Tue, 17 Sep 2019 21:06:03 +0900
Subject: [PATCH 1/2] set: Implement __or__ of set

---
 py/set.go       | 14 ++++++++++++++
 py/tests/set.py | 17 +++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/py/set.go b/py/set.go
index f38b32ff..3b35bf8d 100644
--- a/py/set.go
+++ b/py/set.go
@@ -125,6 +125,20 @@ func (s *Set) M__and__(other Object) (Object, error) {
 	return ret, nil
 }
 
+func (s *Set) M__or__(other Object) (Object, error) {
+	ret := s
+	b, ok := other.(*Set)
+	if !ok {
+		return nil, ExceptionNewf(TypeError, "unsupported operand type(s) for &: '%s' and '%s'", s.Type().Name, other.Type().Name)
+	}
+	for i := range b.items {
+		if _, ok := s.items[i]; !ok {
+			ret.items[i] = SetValue{}
+		}
+	}
+	return ret, nil
+}
+
 // Check interface is satisfied
 var _ I__len__ = (*Set)(nil)
 var _ I__bool__ = (*Set)(nil)
diff --git a/py/tests/set.py b/py/tests/set.py
index e1500ed1..e46b412a 100644
--- a/py/tests/set.py
+++ b/py/tests/set.py
@@ -13,4 +13,21 @@
 assert 2 in d
 assert 3 in d
 
+doc="__or__"
+a = {1, 2, 3}
+b = {2, 3, 4, 5}
+c = a.__or__(b)
+assert 1 in c
+assert 2 in c
+assert 3 in c
+assert 4 in c
+assert 5 in c
+
+d = a | b
+assert 1 in c
+assert 2 in c
+assert 3 in c
+assert 4 in c
+assert 5 in c
+
 doc="finished"
\ No newline at end of file

From 8cc93532c1b7f5de3840e52a367f17017936e3a3 Mon Sep 17 00:00:00 2001
From: DoDaek <dbxor8960@naver.com>
Date: Tue, 17 Sep 2019 21:34:27 +0900
Subject: [PATCH 2/2] set: create a new instance for the value returned

---
 py/set.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/py/set.go b/py/set.go
index 3b35bf8d..af4eb4e5 100644
--- a/py/set.go
+++ b/py/set.go
@@ -126,11 +126,14 @@ func (s *Set) M__and__(other Object) (Object, error) {
 }
 
 func (s *Set) M__or__(other Object) (Object, error) {
-	ret := s
+	ret := NewSet()
 	b, ok := other.(*Set)
 	if !ok {
 		return nil, ExceptionNewf(TypeError, "unsupported operand type(s) for &: '%s' and '%s'", s.Type().Name, other.Type().Name)
 	}
+	for j := range s.items {
+		ret.items[j] = SetValue{}
+	}
 	for i := range b.items {
 		if _, ok := s.items[i]; !ok {
 			ret.items[i] = SetValue{}