[Haskell-cafe] Trouble building happy/alex with Stack lts-9.20

[Michael Snoyman]

You'll need to run `stack upgrade` first.

On Mon, Dec 25, 2017 at 3:40 PM, Eric McCorkle <eric at metricspace.net> wrote:

> Can unpack, and happy.cabal is definitely there.  Unfortunately, stack
> init or stack build seems to fail with an aeson exception:
>
> AesonException "Error in
> $.packages.cassava.constraints.flags['bytestring--lt-0_10_4']: Invalid
> flag name: \"bytestring--lt-0_10_4\""
>
>
> On 12/25/2017 07:53, Michael Snoyman wrote:
> > What command are you running to generate this output? Are you able to
> > `stack unpack happy && cd happy-* && stack init && stack build`
> > successfully?
> >
> > On Mon, Dec 25, 2017 at 7:29 AM, Dan Burton <danburton.email at gmail.com
> > <mailto:danburton.email at gmail.com>> wrote:
> >
> >     /cc the haskell-stack mailing list.
> >
> >     On Dec 24, 2017 9:08 AM, "Eric McCorkle" <eric at metricspace.net
> >     <mailto:eric at metricspace.net>> wrote:
> >
> >         Hi folks,
> >
> >         I'm trying to update my language project to happy >= 9.16, so I
> >         can use
> >         typeclass-based parsers.  Unfortunately, I'm running into build
> >         errors
> >         after switching to lts-9.20.  The log file is attached.
> >
> >         I see similar problems when trying to build alex (the lexer
> >         generator).
> >
> >         It seems to be claiming that there is no cabal file, which is
> >         odd, as
> >         there clearly is one (in the source at least).
> >
> >         Has anyone else seen this problem, and if so, what is the
> >         workaround?
> >
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