Description
As reported by giovanni.bricconi on the user list, there is a bug in "fl" parsing that causes solr to get confused when a field name is followed by a newline character – eg: in a requestHandler default like...
<!-- newlines showing using "$" -->$ <str name="fl">$ sku,store_slug$ </str>$
...this results in solr assuming it should use function parsing to evaluate the field name, which can cause missleading errors if the field name can't be used in a function (eg: "can not use FieldCache on multivalued field: store_slug")