Import Control.Monad in Spec (#1487)

mtl-2.3 removes these reexports
yesodweb · Jun 1, 2023 · 434f492 · 434f492
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commit 434f492
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diff --git a/persistent-qq/test/Spec.hs b/persistent-qq/test/Spec.hs
@@ -2,6 +2,7 @@
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE TypeFamilies #-}
 
+import Control.Monad (when)
 import Control.Monad.Logger (LoggingT, runLoggingT)
 import Control.Monad.Trans.Resource
 import Control.Monad.Reader