IsString instance for WidgetT site IO ()

[andrewthad]

I don't know if this has been discussed before, but what do people think about having an IsString instance for WidgetT site IO ()? Every String can trivially be promoted to a widget via:

toWidget . toHtml . pack

This instance would be helpful to me in certain situations (and while I'm at it, an IsString instance for MarkupM () but that isn't part of yesod). Does anyone else think this is a good idea, or do you guys see this kind of thing as harmful/confusing?

[snoyberg]

I don't see a problem