Ur/Web: tests/datatypeP2.ur annotate

Allow subqueries to reference aggregate-only columns of free tables; treat non-COUNT aggregate functions as possibly returning NULL

author	Adam Chlipala <adam@chlipala.net>
date	Sat, 15 Jan 2011 14:53:13 -0500
parents	71bafe66dbe1
children

rev	line source
adamc@194	1 datatype sum a b = Left of a \| Right of b
adamc@194	2
adamc@194	3 val l : sum int string = Left 5
adamc@194	4 val r : sum int string = Right "Hi"
adamc@194	5
adamc@194	6 val show = fn x : sum int string => case x of Left _ => "Left _" \| Right s => s
adamc@194	7
adamc@194	8 val page = fn x => <html><body>
adamc@194	9 {cdata (show x)}
adamc@194	10 </body></html>
adamc@194	11
adamc@194	12 val main : unit -> page = fn () => <html><body>
adamc@194	13 <li><a link={page l}>Left</a></li>
adamc@194	14 <li><a link={page r}>Right</a></li>
adamc@194	15 </body></html>

Mercurial > urweb