Fix JetSimpleNameExpression.getReceiverExpression

The receiver of `in` expressions is on the right, not the left.

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetSimpleNameExpression.java

@@ -24,6 +24,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.parsing.JetExpressionParsing;
 import org.jetbrains.jet.lang.resolve.name.Name;
+import org.jetbrains.jet.lang.types.expressions.OperatorConventions;
 import org.jetbrains.jet.lexer.JetTokens;
 
 import static org.jetbrains.jet.lexer.JetTokens.*;
@@ -58,7 +59,11 @@ public class JetSimpleNameExpression extends JetReferenceExpression {
             }
         }
         else if (parent instanceof JetBinaryExpression && ((JetBinaryExpression) parent).getOperationReference() == this) {
-            return ((JetBinaryExpression) parent).getLeft();
+            JetBinaryExpression expr = (JetBinaryExpression) parent;
+            //noinspection SuspiciousMethodCalls
+            return OperatorConventions.IN_OPERATIONS.contains(expr.getOperationToken())
+                   ? expr.getRight()
+                   : expr.getLeft();
         }
         else if (parent instanceof JetUnaryExpression && ((JetUnaryExpression) parent).getOperationReference() == this) {
             return ((JetUnaryExpression) parent).getBaseExpression();

compiler/tests/org/jetbrains/jet/lang/psi/JetSimpleNameExpressionTest.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.jet.lang.psi
+
+import org.junit.Assert
+import org.jetbrains.jet.JetLiteFixture
+import org.jetbrains.jet.cli.jvm.compiler.JetCoreEnvironment
+import org.jetbrains.jet.config.CompilerConfiguration
+
+public class JetSimpleNameExpressionTest() : JetLiteFixture() {
+    public fun testGetReceiverExpressionIdentifier() {
+        // Binary Expressions
+        assertReceiver("1 + 2", "1")
+        assertReceiver("1 in array(1)", "array(1)")
+        assertReceiver("1 !in array(1)", "array(1)")
+        assertReceiver("1 to 2", "1")
+    }
+    private fun assertReceiver(exprString: String, expected: String) {
+        val expression = JetPsiFactory.createExpression(getProject(), exprString) as JetBinaryExpression
+        Assert.assertEquals(expected, expression.getOperationReference().getReceiverExpression()!!.getText())
+    }
+    override fun createEnvironment(): JetCoreEnvironment {
+        return JetCoreEnvironment.createForTests(getTestRootDisposable()!!, CompilerConfiguration())
+    }
+}