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T9497a.hs:2:8: warning: [-Wtyped-holes (in -Wdefault)]
• Found hole: _main :: IO ()
Or perhaps ‘_main’ is mis-spelled, or not in scope
• In an equation for ‘main’: main = _main
• Relevant bindings include main :: IO () (bound at T9497a.hs:2:1)
Valid hole fits include
main :: IO () (bound at T9497a.hs:2:1)
readLn :: forall a. Read a => IO a
with readLn @()
(imported from ‘Prelude’ at T9497a.hs:1:1
(and originally defined in ‘System.IO’))
mempty :: forall a. Monoid a => a
with mempty @(IO ())
(imported from ‘Prelude’ at T9497a.hs:1:1
(and originally defined in ‘GHC.Base’))
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