I opened the following ticket for this issue: https://ghc.haskell.org/trac/ghc/ticket/10196

On Fri, Mar 27, 2015 at 1:50 AM, Yongqian Li <yongqli@10gic.net> wrote:
Is this a bug, and if so, will it be fixed before the final release?
We currently use subscript characters in our identifiers and would
like to see the old behavior restored...
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