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AesonException: Invalid flag name #3634

@mrkkrp

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@mrkkrp

I wanted to try brittany, but stack said "no":

~/.stack $ stack install brittany-0.9.0.0 --resolver=nightly-2017-12-09
Downloaded nightly-2017-12-09 build plan.
AesonException "Error in $.packages.cassava.constraints.flags['bytestring--lt-0_10_4']: Invalid flag name: \"bytestring--lt-0_10_4\""
~/.stack $ stack --version
Version 1.5.1, Git revision 600c1f01435a10d127938709556c1682ecfd694e (4861 commits) x86_64 hpack-0.17.1

P.S. I'm forced to use 1.5.1, because 1.6.1 is not fully functional #3630.

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