Fixes PSI

python/src/com/jetbrains/python/psi/impl/PyAssignmentStatementImpl.java

@@ -58,7 +58,9 @@ public class PyAssignmentStatementImpl extends PyElementImpl implements PyAssign
     List<PyExpression> candidates = PyUtil.flattenedParens(psi_nodes); // put all possible tuples to one level
     List<PyExpression> targets = new ArrayList<PyExpression>();
     for (PyExpression expr : candidates) { // only filter out targets
-      if (expr instanceof PyTargetExpression || expr instanceof PySubscriptionExpression) {
+      if (expr instanceof PyTargetExpression ||
+          expr instanceof PyReferenceExpression ||
+          expr instanceof PySubscriptionExpression) {
         targets.add(expr);
       }
     }

python/testData/codeInsight/controlflow/assignment2.py

@@ -0,0 +1,3 @@
+sibling = []
+if sibling:
+  sibling[0].text = 123

python/testData/codeInsight/controlflow/assignment2.txt

@@ -0,0 +1,11 @@
+0(1) element: null
+1(2) element: PyAssignmentStatement
+2(3) WRITE ACCESS: sibling
+3(4) element: PyIfStatement
+4(5,10) READ ACCESS: sibling
+5(6) element: PyStatementList. Condition: sibling:true
+6(7) element: PyAssignmentStatement
+7(8) element: PySubscriptionExpression
+8(9) READ ACCESS: sibling
+9(10) READ ACCESS: text
+10() element: null

python/testSrc/com/jetbrains/python/PyControlFlowBuilderTest.java

@@ -74,6 +74,10 @@ public class PyControlFlowBuilderTest extends LightMarkedTestCase {
     doTest();
   }
 
+  public void testAssignment2() throws Exception {
+    doTest();
+  }
+
   public void testAugAssignment() throws Exception {
     doTest();
   }