Couch-lucene - Index all - JSON.parse: expected ',' or '}' after property value in object

[Mike Kimber]

Ive built/installed couch-lucene and pointed it at my couchdb database (1.2). 
It works when I index a a individual attribute/key pair, but when I try an use 
the index all js code on https://github.com/rnewson/couchdb-lucene via futon I 
get

JSON.parse: expected ',' or '}' after property value in object
JSON.parse: expected ',' or '}' after property value in object

Ive tried formatting it etc and it all looks fine, but the error message states 
that the JSON is not valid. My design document looks like:

{
   "_id": "_design/lucene",
   "_rev": "18-22fdad425fb9f8cd1d8e39ba4b871103",
   "language": "javascript",
   "fulltext": {
       "all": {
           "index": "function(doc) {var ret = new Document(); function idx(obj) 
{for (var key in obj) {switch (typeof obj[key]) {case 'object': idx(obj[key]); 
break; case 'function': break; default: ret.add(obj[key]); break;}}}; idx(doc); 
if (doc._attachments) {for (var i in doc._attachments) 
{ret.attachment("attachment", i); }}return ret; }"
       }
   }
}

The following works, so this suggest to me that it's the javascript that is the 
issue

Source
{
   "_id": "_design/lucene",
   "_rev": "19-1c7be47e52f8a65e9bb387e8c3251dd4",
   "language": "javascript",
   "fulltext": {
       "by_type": {
           "index": "function(doc) { var res = new Document(); res.add( 
doc.header.started); return res; }"
       }
   }
}

Any help would be greatly as would be any tips on how to debug this sort of 
thing in the future.

Thanks

Mike