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 wrote:

/cc the haskell-stack mailing list.

On Dec 24, 2017 9:08 AM, "Eric McCorkle" 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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You'll need to run `stack upgrade` first. On Mon, Dec 25, 2017 at 3:40 PM, Eric McCorkle 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 mailto:danburton.email@gmail.com> wrote:

/cc the haskell-stack mailing list.

On Dec 24, 2017 9:08 AM, "Eric McCorkle" mailto:eric@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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