mocha silent error in `before`

mocha-before-silent-error.js

describe('silent error', function() {

	/*
	// ReferenceError bubbles up just fine
	before(function() {
		assert('foo');
	});
	*/

	/*
	// ReferenceError bubbles up just fine
	before(function(done) {
		assert('foo');
		done();
	});
	*/

	// ReferenceError dies silently, test never completes
	before(function(done) {
		setTimeout(function() {
			assert('foo');
		}, 10);
	});

});