Ur/Web: tests/snest.ur annotate

Protect against NULL applications in a few places

author	Adam Chlipala <adamc@hcoop.net>
date	Thu, 31 Dec 2009 15:14:24 -0500
parents	8932f855fa85
children

rev	line source
adamc@1039	1 fun main () =
adamc@1039	2 s1 <- source False;
adamc@1039	3 s2 <- source False;
adamc@1039	4
adamc@1039	5 return <xml><body>
adamc@1039	6 <dyn signal={s1 <- signal s1;
adamc@1039	7 return (if s1 then
adamc@1039	8 <xml><dyn signal={s2 <- signal s2;
adamc@1039	9 return <xml>{[s2]}</xml>}/></xml>
adamc@1039	10 else
adamc@1039	11 <xml>Not yet</xml>)}/>
adamc@1039	12 <hr/>
adamc@1039	13 <button value="s1" onclick={set s1 True}/>
adamc@1039	14 <button value="s2" onclick={set s2 True}/>
adamc@1039	15 </body></xml>

Mercurial > urweb