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import GHC.Conc main=putStr"\rLoading... ">>mapMmapM(\c->putStr('\b':[c])>>threadDelay 250000)"|.putStr)$("\rLoading... "++).pure<$>cycle"|/-\\">>main\\"
Thanks @nimi for saving 12 bytes!
import GHC.Conc main=putStr"\rLoading... ">>mapM(\c->putStr('\b':[c])>>threadDelay 250000)"|/-\\">>main
import GHC.Conc mapM((>>threadDelay 250000).putStr)$("\rLoading... "++).pure<$>cycle"|/-\\"