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logEvent : Event -> List PlaceholderValue -> Maybe String
logEvent e vals = loop (messageSpec e) vals (title e ++ ": ")
where
loop : Schema -> List PlaceholderValue -> String -> Maybe String
loop [] [] out = pure out
loop (IntVar :: xs) (IntVal i :: ys) out = loop xs ys (out ++ show i)
loop (StrVar :: xs) (StrVal s :: ys) out = loop xs ys (out ++ s)
loop (StrCst x :: xs) ys out = loop xs ys (out ++ x)
loop _ _ _ = Nothing
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