[Haskell-cafe] stack and GHCJS

Dennis Raddle dennis.raddle at gmail.com
Sat Apr 7 19:53:04 UTC 2018

Now I'm trying to use stack to install and run GCHJS. Can someone help me
figure out this error?

I first created project 'proj01' using the ghcjs template via

    stack new proj01 ghcjs

Then I typed

    stack build

It ran for a while, then gave an error messages that starts

    "While building custom Setup.hs for package semigroupoids- using
.... <very long description>, Process exited with code ExitFailure 1"

But it didn't halt. Instead it started compiling Main.hs, and ended up

"at least the following dependencies are missing: tagged >= 0.8.5 && <1 &&

I tried adding "tagged" to the extra-deps in the stack.yaml, but it didn't

While I'm posting, is there a resource that explains background to this? I
don't know much about "packages," "snapshots," "dependencies", means of
specifying versions, cabal, or YAML files. Everything I find online seems
to assume some background knowledge of these things. For instance the stack
documentation talks about snapshots, but I can't find an explanation that I
understand for what a "snapshot" actually is. Ditto for all these many
concepts that go into configuring and building.

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