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haskellyesodblaze-html

using yesod without Shakespeare

This post shows how to use yesod directly with blaze-html,but following this post ghc complains that:

No instance for (ToWidget App (t0 -> H.Html))
  arising from a use of ‘toWidget’
In the expression: toWidget
In a stmt of a 'do' block: toWidget $ \ render -> do { H.p "" }
In the second argument of ‘($)’, namely
  ‘do { toWidget $ \ render -> do { ... } }’

I checked source of the required yesod.pure module,but found there's no such instance for Towidget..

Solution

  • Are you including the package yesod-core and the module Yesod.Core?

    That's where the ToWidget class is defined.

    I used Hayoo to find where ToWidget was defined.