[Haskell-cafe] Re: [Haskell] Top Level <-
ganesh.sittampalam at credit-suisse.com
Wed Sep 3 03:05:58 EDT 2008
Ashley Yakeley wrote:
>Ganesh Sittampalam wrote:
>> In any case, what I'm trying to establish below is that it should be
>> safety property of <- that the entire module (or perhaps mutually
>> recursive groups of them?) can be duplicated safely - with a new
>> or as if with a new name - and references to it randomly rewritten to
>> the duplicate, as long as the result still type checks.
> That's not acceptable. This would cause Unique to break,
> as its MVar would be created twice. It would also mean
> that individual Unique and IOWitness values created by
> <- would have different values depending on which bit
> of code was referencing them. It would render the extension
> useless as far as I can see.
The result wouldn't typecheck if two Unique values that now pointed to
the two different modules were compared.
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