No packages found ... "hsc2hs" executable

[alx741]

I'm following: http://www.yesodweb.com/page/quickstart, but completely unable to use Yesod at all.

In step 4. Build libraries: stack build I get:

No packages found in snapshot which provide a "hsc2hs" executable, which is a build-tool dependency of "skein"
Missing build-tools may be caused by dependencies of the build-tool being overridden by extra-deps.
This should be fixed soon - see this issue commercialhaskell/stack#595
While constructing the build plan, the following exceptions were encountered:
Plan construction failed.

I've tried removing ~/.cabal, ~/.stack , the stack tool, and basically starting everything from scratch with fresh installations but the problem persists, so I assume this is a bug, presumably on Yesod but could it be on Stack (?).

Trying stack exec -- yesod devel produces an infinite loop of:

cabal: At least the following dependencies are missing:
classy-prelude >=0.10.2,
classy-prelude-conduit >=0.10.2,
classy-prelude-yesod >=0.10.2,
data-default -any,
hjsmin >=0.1 && <0.3,
monad-logger ==0.3.*,
persistent >=2.0 && <2.7,
persistent-sqlite >=2.1.1 && <2.7,
persistent-template >=2.0 && <2.7,
safe -any,
yesod >=1.4.3 && <1.5,
yesod-auth >=1.4.0 && <1.5,
yesod-core >=1.4.17 && <1.5,
yesod-form >=1.4.0 && <1.5,
yesod-static >=1.4.0.3 && <1.6
Resolving dependencies...
Configuring yesod-0.0.0...

I've tried a couple months ago and I've desisted because of the exact same problem, tried again today with the hope it would be fixed but it's still the same.

Using Archlinux and Stack version 1.2.0-11 (from Arch repos).

Sorry if I'm missing something obvious.

[snoyberg]

Thanks for the report, and sorry for the inconvenience.

Can you include the generated stack.yaml file?

On Thu, Nov 17, 2016, 7:03 AM Daniel Campoverde notifications@github.com
wrote:

I'm following: http://www.yesodweb.com/page/quickstart, but completely
unable to use Yesod at all.

In step 4. Build libraries: stack build I get:

No packages found in snapshot which provide a "hsc2hs" executable, which
is a build-tool dependency of "skein"
Missing build-tools may be caused by dependencies of the build-tool being
overridden by extra-deps.
This should be fixed soon - see this issue commercialhaskell/stack#595
commercialhaskell/stack#595
While constructing the build plan, the following exceptions were
encountered:
Plan construction failed.

I've tried removing ~/.cabal, ~/.stack , the stack tool, and basically
starting everything from scratch with fresh installations but the problem
persists, so I assume this is a bug, presumably on Yesod but could it
be on Stack (?).

Trying stack exec -- yesod devel produces an infinite loop of:

cabal: At least the following dependencies are missing:
classy-prelude >=0.10.2,
classy-prelude-conduit >=0.10.2,
classy-prelude-yesod >=0.10.2,
data-default -any,
hjsmin >=0.1 && <0.3,
monad-logger ==0.3.*,
persistent >=2.0 && <2.7,
persistent-sqlite >=2.1.1 && <2.7,
persistent-template >=2.0 && <2.7,
safe -any,
yesod >=1.4.3 && <1.5,
yesod-auth >=1.4.0 && <1.5,
yesod-core >=1.4.17 && <1.5,
yesod-form >=1.4.0 && <1.5,
yesod-static >=1.4.0.3 && <1.6
Resolving dependencies...
Configuring yesod-0.0.0...

I've tried a couple months ago and I've desisted because of the exact same
problem, tried again today with the hope it would be fixed but its the same.

Using Archlinux and Stack version 1.2.0-11 (from Arch repos).

Sorry if I'm missing something obvious.

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[alx741]

Can you include the generated stack.yaml file?

Sure:
stack.yaml: http://pastebin.com/VTyzwv7Z
yesod.cabal: http://pastebin.com/D0Mqb7WX

[snoyberg]

Alright, that looks fine. Can you try running the following and pasting the output?

stack build hsc2hs -v
stack build -v

[alx741]

stack build hsc2hs -v http://pastebin.com/mQdELM9D
stack build -v http://pastebin.com/3fB4C50s

[snoyberg]

Doh, I remember this now. We need a better error message.

Try again with a different project name. yesod is the name of a library
you're depending on, which confuses Stack. I'll try to make the error
message better later today.

On Thu, Nov 17, 2016, 7:44 AM Daniel Campoverde notifications@github.com
wrote:

stack build hsc2hs -v http://pastebin.com/mQdELM9D
stack build -v http://pastebin.com/3fB4C50s

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[alx741]

Oh!! that made it!

Should have ctrl+c , ctrl+v-ed the commands from the quickstart guide. Sorry about that and thanks a lot! now It works, no bug there apparently 😄

[snoyberg]

It looks like Stack HEAD already gives a better error message:

Error: While constructing the build plan, the following exceptions were encountered:

Dependency cycle detected in packages:
    [yesod,classy-prelude-yesod,yesod]

[finlaydotb]

I just got bit by this! 😅. As someone who is beginning with Haskell, the error message is still not helpful 😅