Parse error is confusing when trying to return two elements

[sophiebits]

(Opening here because esprima-fb apparently doesn't accept issues.)

If you write

return <div className="one" /><div className="two" />;

then you get "Unexpected identifier" because it tries to parse it as

return React.DOM.div({className: "one"})  < div className ...

That is, the < of the second div is interpreted as a less than. I think we can give nicer errors here if we disallow the less than operator directly after an XJSElement. I don't think this prevents any real uses but if it did, you could always wrap it in parens:

return (<div className="one" />) < threshold;

cc @jeffmo @syranide

[sophiebits]

facebookarchive/esprima#20 was merged; we can close this after a version bump.