<div dir="ltr">You'll need to run `stack upgrade` first.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Dec 25, 2017 at 3:40 PM, Eric McCorkle <span dir="ltr"><<a href="mailto:eric@metricspace.net" target="_blank">eric@metricspace.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Can unpack, and happy.cabal is definitely there.  Unfortunately, stack<br>
init or stack build seems to fail with an aeson exception:<br>
<br>
AesonException "Error in<br>
$.packages.cassava.<wbr>constraints.flags['bytestring-<wbr>-lt-0_10_4']: Invalid<br>
flag name: \"bytestring--lt-0_10_4\""<br>
<span class="im HOEnZb"><br>
<br>
On 12/25/2017 07:53, Michael Snoyman wrote:<br>
> What command are you running to generate this output? Are you able to<br>
> `stack unpack happy && cd happy-* && stack init && stack build`<br>
> successfully?<br>
><br>
> On Mon, Dec 25, 2017 at 7:29 AM, Dan Burton <<a href="mailto:danburton.email@gmail.com">danburton.email@gmail.com</a><br>
</span><span class="im HOEnZb">> <mailto:<a href="mailto:danburton.email@gmail.com">danburton.email@gmail.<wbr>com</a>>> wrote:<br>
><br>
>     /cc the haskell-stack mailing list.<br>
><br>
>     On Dec 24, 2017 9:08 AM, "Eric McCorkle" <<a href="mailto:eric@metricspace.net">eric@metricspace.net</a><br>
</span><div class="HOEnZb"><div class="h5">>     <mailto:<a href="mailto:eric@metricspace.net">eric@metricspace.net</a>>> wrote:<br>
><br>
>         Hi folks,<br>
><br>
>         I'm trying to update my language project to happy >= 9.16, so I<br>
>         can use<br>
>         typeclass-based parsers.  Unfortunately, I'm running into build<br>
>         errors<br>
>         after switching to lts-9.20.  The log file is attached.<br>
><br>
>         I see similar problems when trying to build alex (the lexer<br>
>         generator).<br>
><br>
>         It seems to be claiming that there is no cabal file, which is<br>
>         odd, as<br>
>         there clearly is one (in the source at least).<br>
><br>
>         Has anyone else seen this problem, and if so, what is the<br>
>         workaround?<br>
><br>
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</div></div></blockquote></div><br></div>