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T9497b-run: T9497b-run.hs:2:8: error:
• Found hole: _main :: IO ()
Or perhaps ‘_main’ is mis-spelled, or not in scope
• In the expression: _main
In an equation for ‘main’: main = _main
• Relevant bindings include
main :: IO () (bound at T9497b-run.hs:2:1)
Valid substitutions include
main :: IO () (defined at T9497b-run.hs:2:1)
readLn :: forall a. Read a => IO a
(imported from ‘Prelude’ at T9497b-run.hs:1:1
(and originally defined in ‘System.IO’))
mempty :: forall a. Monoid a => a
(imported from ‘Prelude’ at T9497b-run.hs:1:1
(and originally defined in ‘GHC.Base’))
undefined :: forall a. GHC.Stack.Types.HasCallStack => a
(imported from ‘Prelude’ at T9497b-run.hs:1:1
(and originally defined in ‘GHC.Err’))
(deferred type error)
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