Ur/Web: demo/url.ur annotate

Add a new scoping check for unification variables, to fix a type inference bug

author	Adam Chlipala <adam@chlipala.net>
date	Sun, 18 Dec 2011 11:29:13 -0500
parents	412ccd97ab71
children

rev	line source
adamc@774	1 fun yourChoice r = return <xml><body>
adamc@774	2 {case checkUrl r.Url of
adamc@774	3 None => <xml>You aren't allowed to link to there.</xml>
adamc@774	4 \| Some url => <xml><a href={url}>Enjoy!</a></xml>}
adamc@774	5 </body></xml>
adamc@774	6
adamc@774	7 fun main () = return <xml><body>
adamc@774	8 <a href="http://en.wikipedia.org/wiki/Type_inference">Learn something</a><br/>
adamc@774	9 <br/>
adamc@774	10 <form>
adamc@774	11 URL of your choice: <textbox{#Url}/> <submit action={yourChoice}/>
adamc@774	12 </form>
adamc@774	13 </body></xml>

Mercurial > urweb