test/YesodCoreTest/SubSub.hs:21:10: error: • No instance for (RenderRoute App)

[juhp]

Testsuite failing: I tried for build yesod-core-1.6.24.3 tests for Fedora (basically Stackage lts-21):

test/YesodCoreTest/SubSub.hs:21:10: error:
    • No instance for (RenderRoute App)
        arising from the superclasses of an instance declaration
    • In the instance declaration for ‘Yesod App’
   |
21 | instance Yesod App
   |          ^^^^^^^^^

So I will just disable the testsuite.

[jezen]

Interestingly, this fails all the nightly-2022-02-11 checks but passes with older resolvers.

https://github.com/yesodweb/yesod/actions/runs/5500071001/job/14968314065?pr=1805

This change came from #1805 which was merged a couple of weeks ago.

We should probably update the CI configuration to run checks with more recent resolvers.

[jezen]

Ok, so this is the same problem as this: https://stackoverflow.com/questions/73719275/evaluation-of-template-haskell-in-yesod?noredirect=1&lq=1.

So the fix for this looks like:

diff --git a/yesod-core/test/YesodCoreTest/SubSub.hs b/yesod-core/test/YesodCoreTest/SubSub.hs
index 2c3ad06c..4f02d48b 100644
--- a/yesod-core/test/YesodCoreTest/SubSub.hs
+++ b/yesod-core/test/YesodCoreTest/SubSub.hs
@@ -18,6 +18,10 @@ import YesodCoreTest.SubSubData
 
 data App = App { getOuter :: OuterSubSite }
 
+mkYesod "App" [parseRoutes|
+/ OuterSubSiteR OuterSubSite getOuter
+|]
+
 instance Yesod App
 
 getSubR :: SubHandlerFor InnerSubSite master T.Text
@@ -29,10 +33,6 @@ instance YesodSubDispatch OuterSubSite master where
 instance YesodSubDispatch InnerSubSite master where
   yesodSubDispatch = $(mkYesodSubDispatch resourcesInnerSubSite)
 
-mkYesod "App" [parseRoutes|
-/ OuterSubSiteR OuterSubSite getOuter
-|]
-
 app :: App
 app = App { getOuter = OuterSubSite { getInner = InnerSubSite }}