gistfile1.js

var sys = require('sys'),
    buffer = '{"values":[1,2,3]}';

sys.p(JSON.parse(buffer));
sys.puts("Before values extension worked fine.");

require.paths.unshift('express/lib');
require('express');

sys.p(JSON.parse(buffer));
sys.puts("If you see this, it worked. If not, it's busted.");

/* output: 
08:35 mat@schaffer: ~/code/expressblog
> node --version
0.1.33

08:35 mat@schaffer: ~/code/expressblog
> GIT_DIR=express/.git git rev-parse HEAD
ab6ad94ec380675793c01aef71a45319d1f41c3a

08:35 mat@schaffer: ~/code/expressblog
> node simpletest.js 
{ values: [ 1, 2, 3 ] }
Before values extension worked fine.
TypeError: Cannot set property values of #<an Object> which has only a getter
    at Object.parse (native)
    at Object.<anonymous> (/Users/mat/code/expressblog/simpletest.js:10:12)
    at Module._compile (node.js:721:23)
    at node.js:749:20
    at fs:51:23
    at node.js:810:9
*/