runtime error "expected [Char] but got CopyFile"

[leana8959]

I am learning hakyll and I have trouble reading from a context that depends on files that are also copied. Not coping the files fixes the issue (but then the files won't be available in _site). This might be related to #719, however I have tried the suggestions mentioned there and I get compiler errors at build time. I was unable to change Context String to Context CopyFile.

If I build the site twice it would work, because the files would already have been copied during the first run. For this reason (and seeing that #719 is still open) I suspect that it is a bug in the dependency tracking.

I made the following changes to the code initialized with hakyll.

site.hs

main :: IO ()
main = hakyll $ do
    -- copy the icons to _site
    match "static/assets/88x31/*" $ do
        route idRoute
        compile copyFileCompiler

    match "index.html" $ do
        route idRoute
        compile $ do
            posts <- recentFirst =<< loadAll "posts/*"
            let indexCtx =
                    -- Here I try to create a context that is a list of all the icons
                    listField "buttons" defaultContext (loadAll "static/assets/88x31/*") `mappend`
                    listField "posts" postCtx (return posts) `mappend`
                    defaultContext

            getResourceBody
                >>= applyAsTemplate indexCtx
                >>= loadAndApplyTemplate "templates/default.html" indexCtx
                >>= relativizeUrls

    match "templates/*" $ compile templateBodyCompiler

template/default.html

I want to loop over a list of icons at the bottom of all pages.

        <main role="main">
            <h1>$title$</h1>
            $body$
            <div class="button-container">
                $for(buttons)$
                <img class="button-item" src="$path$">
                $endfor$
            </div>
        </main>

Thank you for your time :)