Make sure that extract variable works for some ranges

test/refactor/extract_variable.py

@@ -119,3 +119,38 @@ x +  1, 3
 #? 4 text {'new_name': 'x'}
 x = x +  1
 x, 3
+# -------------------------------------------------- range-1
+#? 4 text {'new_name': 'x', 'until_column': 9}
+y +  1, 3
+# ++++++++++++++++++++++++++++++++++++++++++++++++++
+#? 4 text {'new_name': 'x', 'until_column': 9}
+x = y +  1, 3
+x
+# -------------------------------------------------- range-2
+#? 1 text {'new_name': 'x', 'until_column': 3}
+y +  1, 3
+# ++++++++++++++++++++++++++++++++++++++++++++++++++
+#? 1 text {'new_name': 'x', 'until_column': 3}
+x = y +  1
+x, 3
+# -------------------------------------------------- range-3
+#? 1 text {'new_name': 'x', 'until_column': 6}
+y +  1, 3
+# ++++++++++++++++++++++++++++++++++++++++++++++++++
+#? 1 text {'new_name': 'x', 'until_column': 6}
+x = y +  1
+x, 3
+# -------------------------------------------------- range-4
+#? 1 text {'new_name': 'x', 'until_column': 1}
+y +  1, 3
+# ++++++++++++++++++++++++++++++++++++++++++++++++++
+#? 1 text {'new_name': 'x', 'until_column': 1}
+x = y
+x +  1, 3
+# -------------------------------------------------- range-5
+#? 0 text {'new_name': 'x', 'until_column': 1}
+y +  1, 3
+# ++++++++++++++++++++++++++++++++++++++++++++++++++
+#? 0 text {'new_name': 'x', 'until_column': 1}
+x = y
+x +  1, 3