Swig template bug with chained instance functions

swig-chained-functions-test

var swig = require('swig');
var assert = require('assert');

swig.invalidateCache();

var failingTemplate = '{% for child in model.getRoot().getChildren() %}{{ child.getName() }}{% endfor %}';
var workingTemplate = '{% for child in model.getChildren() %}{{ child.getName() }}{% endfor %}';
var expected = 'child';

function Model(name, children) {
	assert(this instanceof Model, 'this is not an instance of Model')
	this.name = name;
	this.children = children || [];
};
Model.prototype = {
	getRoot: function() {
		assert(this instanceof Model, 'this is not an instance of Model')
		return model;
	},
	getName: function() {
		assert(this instanceof Model, 'this is not an instance of Model')
		return this.name;
	},
	getChildren: function() {
		assert(this instanceof Model, 'this is not an instance of Model')
		return this.children;
	}
}

var model = new Model('parent', [new Model('child')]);

var options = {
	locals: {
		model: model
	}
};

assert.equal(model.getRoot().getChildren().length, 1);
assert.equal(model.getRoot().getChildren()[0].getName(), expected);

console.log('These pass');
assert.equal(swig.render(workingTemplate, options), expected);
assert.equal(swig.compile(workingTemplate)(options.locals), expected);

console.log('This fails')
var rendered = swig.render(failingTemplate, options);
assert.equal(rendered, expected);

console.log('As does this');
var compiled = swig.compile(failingTemplate);
var compiledRendered = compiled(options.locals)
assert.equal(compiledRendered, expected);