fix for KT-299

compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java

@@ -1196,10 +1196,10 @@ public class ExpressionCodegen extends JetVisitor<StackValue, StackValue> {
             getInIntRange(leftValue, rangeExpression, inverted);
         }
         else {
-            leftValue.put(JetTypeMapper.TYPE_OBJECT, v);
+            FunctionDescriptor op = (FunctionDescriptor) bindingContext.get(BindingContext.REFERENCE_TARGET, expression.getOperationReference());
+            leftValue.put(typeMapper.mapType(op.getValueParameters().get(0).getOutType()), v);
             genToJVMStack(expression.getRight());
             v.swap();
-            FunctionDescriptor op = (FunctionDescriptor) bindingContext.get(BindingContext.REFERENCE_TARGET, expression.getOperationReference());
             invokeFunctionNoParams(op, Type.BOOLEAN_TYPE, v);
         }
         return StackValue.onStack(Type.BOOLEAN_TYPE);

idea/testData/codegen/regressions/kt299.jet

@@ -0,0 +1,17 @@
+class MyRange1() : Range<Int> {
+    override fun contains(item: Int) = true
+}
+
+class MyRange2() {
+    fun contains(item: Int) = true
+}
+
+fun box(): String {
+    if (1 in MyRange1()) {
+        if (1 in MyRange2()) {
+            return "OK"
+        }
+        return "fail 2"
+    }
+    return "fail 1"
+}

idea/tests/org/jetbrains/jet/codegen/ControlStructuresTest.java

@@ -177,4 +177,8 @@ public class ControlStructuresTest extends CodegenTestCase {
         assertEquals(true, main.invoke(null, null, "lala"));
         assertEquals(false, main.invoke(null, "papa", "papa"));
     }
+
+    public void testKt299() throws Exception {
+        blackBoxFile("regressions/kt299.jet");
+    }
 }