Backwards breaking change for setEnv

[Bryan O'Sullivan]

Yes please!

On Mon, Aug 15, 2016 at 11:17 PM, Edward Z. Yang <ezyang at mit.edu> wrote:

> Hello all,
>
> I wanted to bring this bug to the attention of the CLC
>
>     https://ghc.haskell.org/trac/ghc/ticket/12494#ticket
>
> I propose that we change 'setEnv k ""' to set the environment
> variable to an empty string, rather than delete the environment
> variable.  The existing behavior was motivated by a Windows
> "quirk" that actually doesn't exist (details in ticket.)
>
> Thanks,
> Edward
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