Mercurial > urweb
view tests/option.ur @ 1382:5cb95fb7d4d5
Broaden definition of valueish
author | Adam Chlipala <adam@chlipala.net> |
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date | Thu, 06 Jan 2011 09:25:15 -0500 |
parents | 77a28e7430bf |
children |
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datatype option a = None | Some of a val none_Hi : option string = None val some_Hi = Some "Hi" val none_some_Hi : option (option string) = None val some_some_Hi = Some some_Hi val show = fn x => case x of None => "None" | Some x => x val show2 = fn x => case x of None => "None'" | Some x => show x val page = fn x => return <html><body> {cdata (show x)} </body></html> val page2 = fn x => return <html><body> {cdata (show2 x)} </body></html> val main : unit -> transaction page = fn () => return <html><body> <li><a link={page none_Hi}>None1</a></li> <li><a link={page some_Hi}>Some1</a></li> <li><a link={page2 none_some_Hi}>None2</a></li> <li><a link={page2 some_some_Hi}>Some2</a></li> </body></html>