Error in Patchwork: "Only variables should be passed by reference"

[Spudley]

I have been trying to get going with Patchwork, in order to help me write unit tests to a legacy PHP codebase. Unfortunately, I have run into an error which I can't resolve.

Whenever I try to call an overridden method, I get the following error: "Only variables should be passed by reference"

I have a very simple test case that demonstrates this:

<?php
require_once('../build/patchwork/Patchwork.php');
require_once('../build/clsOverrideMe.php');

class patchworkTest extends PHPUnit_Framework_TestCase {
    public function testOverrideMe() {
        Patchwork\replace("clsOverrideMe::sayBar", function() { return "overridden"; });
        $result = clsOverrideMe::sayBar();  //standard $result='bar', but with Patchwork, $result='overridden'.
    }
}

...and clsOverrideMe.php:

<?php
class clsOverrideMe {
    public static function sayBar() {
        return "bar";
    }
}

Then at the command prompt, I get the following:

C:\DEVELOPMENT\_tests>phpunit patchworkTest.php
PHPUnit 3.5.14 by Sebastian Bergmann.

E

Time: 0 seconds, Memory: 6.75Mb

There was 1 error:

1) patchworkTest::testClsOverrideMe
Only variables should be passed by reference

C:\DEVELOPMENT\build\patchwork\lib\Stack.php:39
C:\DEVELOPMENT\build\patchwork\lib\Interceptor.php:68
C:\DEVELOPMENT\build\patchwork\lib\Interceptor.php:87
C:\DEVELOPMENT\build\patchwork\lib\Stack.php:27
C:\DEVELOPMENT\build\patchwork\lib\Interceptor.php:93
C:\DEVELOPMENT\build\clsOverrideMe.php:3
C:\DEVELOPMENT\_tests\patchworkTest.php:8

FAILURES!
Tests: 1, Assertions: 0, Errors: 1.

Any idea what I'm doing wrong here? Or have I found a bug in Patchwork?

The above is the simplest possible example I could come up with in the context of PHPUnit (ie how I want to use it). It also throws the same error when written as a simple PHP program.

PHP version 5.3.8 on Windows7.

[antecedent]

This seems to overlap with this other report of yours, which I've already addressed. Thanks!

[Spudley]

It does indeed overlap -- it's the same issue: I posted this ticket first, and then decided to try fixing it myself; the second ticket was generated by Github when I posted the fix. :-)