[Haskell-cafe] GHC magic optimization ?

[wren ng thornton]

Luke Palmer wrote:
> On Fri, Dec 4, 2009 at 9:44 AM, Mark Lentczner <markl at glyphic.com> wrote:
>> On Dec 4, 2009, at 2:43 AM, Luke Palmer wrote:
>>
>>> So GHC leaves it to the user to specify sharing.  If you want an
>>> expression shared, let bind it and reuse.
>> Does GHC treat where and let the same in this regard? Or in code, are these treated the same?
> 
> where is just sugar for let.

Well, they have different scoping properties because they're in 
different syntactic classes in the parser (let is an expression whereas 
where is a modifier on statements), but other than that yes they're the 
same.

-- 
Live well,
~wren