Update _listcomp.py

tests/_listcomp.py

@@ -27,4 +27,11 @@ assert a == '1234'
 
 assert reversed([]) == []
 assert reversed('') == []
-assert reversed('测试') == ['试', '测']
+assert reversed('测试') == ['试', '测']
+
+a = [
+    [(i,j) for j in range(10) if j % 2 == 0]
+    for i in range(10) if i % 2 == 1
+]
+
+assert a == [[(1, 0), (1, 2), (1, 4), (1, 6), (1, 8)], [(3, 0), (3, 2), (3, 4), (3, 6), (3, 8)], [(5, 0), (5, 2), (5, 4), (5, 6), (5, 8)], [(7, 0), (7, 2), (7, 4), (7, 6), (7, 8)], [(9, 0), (9, 2), (9, 4), (9, 6), (9, 8)]]