[Haskell-cafe] Syntax extension - adding import support to let/where bindings

[Richard A. O'Keefe]

On 5/08/2015, at 10:28 pm, Oliver Charles <ollie at ocharles.org.uk> wrote:
> That's not particularly bad here, the really pain is repeatedly having to do this for every single symbol I'm using. I'd prefer to be able to write
> 
> image = 
>   let css = let import CSS in [ width (px 50) ]
>   in let import HTML in img [ width 50, style css ]

This is very like the 'open' directive in SML.
The SML version would be something like

val image =
    let val css = let open CSS in [width (px 50)] end
     in let open HTML in img [width 50, style css] end
    end

So there's prior art.