Fix trying to insert declaration in dummy.py file for extract variable

python/src/com/jetbrains/python/refactoring/PyReplaceExpressionUtil.java

@@ -52,6 +52,7 @@ public class PyReplaceExpressionUtil implements PyElementTypes {
    * It can happen in cases like (here {@code <start> and <end>} represent selection boundaries):
    * <ul>
    *   <li>Selection conflicts with operator precedence: {@code n = 1 * <start>2 + 3<end>}</li>
+   *   <li>Selection conflicts with operator associativity: {@code n = 1 + <start>2 + 3<end>}</li>
    *   <li>Part of string literal is selected: {@code s = 'green <start>eggs<end> and ham'}</li>
    * </ul>
    */

python/src/com/jetbrains/python/refactoring/introduce/IntroduceHandler.java

@@ -69,6 +69,11 @@ import static com.jetbrains.python.inspections.PyStringFormatParser.*;
 abstract public class IntroduceHandler implements RefactoringActionHandler {
   protected static PsiElement findAnchor(List<PsiElement> occurrences) {
     PsiElement anchor = occurrences.get(0);
+    final Pair<PsiElement, TextRange> data = anchor.getUserData(PyReplaceExpressionUtil.SELECTION_BREAKS_AST_NODE);
+    // Search anchor in the origin file, not in dummy.py, if selection breaks statement and thus element was generated
+    if (data != null && occurrences.size() == 1) {
+      return PsiTreeUtil.getParentOfType(data.getFirst(), PyStatement.class);
+    }
     next:
     do {
       final PyStatement statement = PsiTreeUtil.getParentOfType(anchor, PyStatement.class);

python/testData/refactoring/introduceVariable/selectionBreaksBinaryOperator.after.py

@@ -0,0 +1,3 @@
+def foo():
+    a = 2 + 3
+    print 1 + a

python/testData/refactoring/introduceVariable/selectionBreaksBinaryOperator.py

@@ -0,0 +1,2 @@
+def foo():
+    print 1 + <selection>2 + 3</selection>

python/testSrc/com/jetbrains/python/refactoring/PyIntroduceVariableTest.java

@@ -245,6 +245,8 @@ public class PyIntroduceVariableTest extends PyIntroduceTestCase {
     }
   }
 
+  public void testSelectionBreaksBinaryOperator() {doTest();}
+
   private void doTestCannotPerform() {
     boolean thrownExpectedException = false;
     try {