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cabal install yesod-platform fails #545

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mebaran opened this issue May 2, 2013 · 3 comments
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cabal install yesod-platform fails #545

mebaran opened this issue May 2, 2013 · 3 comments

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@mebaran
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mebaran commented May 2, 2013

It looks like Yesod-Core needs MultiParamTypeClasses enabled. The output states Widget.hs 77 needs this feature enabled.

For reference I'm on Windows GHC 7.4.2.

Thanks,
Mark
@mebaran
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mebaran commented May 2, 2013

Just checking the file, building yesod-core (via cabal unpack) by hand and passing --ghc-options=-XMultiParamTypeClasses seems to solve the problem, even though the source file looks right.

@snoyberg
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snoyberg commented May 3, 2013

That looks like a bug in GHC to me. I've just pushed a workaround and released to Hackage as 1.2.0.2. I'd suggest opening a bug with GHC about this as well.

snoyberg added a commit that referenced this issue May 3, 2013
@snoyberg
Workaround for #545
1bcc05a
@MatthewDarling MatthewDarling mentioned this issue May 6, 2013
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@gregwebs
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@gregwebs @snoyberg @mebaran