GHCi, version 9.3.20211019: https://www.haskell.org/ghc/  :? for help
ghci> [1 of 2] Compiling Main             ( shell.hs, interpreted )
[2 of 2] Linking shell
Ok, one module loaded.
ghci> ghci> [1 of 1] Compiling T18330           ( T18330.hs, interpreted )
Ok, one module loaded.
ghci> ghci> [1 of 1] Compiling T18330           ( T18330.hs, interpreted ) [T18330.extra changed]
Ok, one module loaded.
ghci> Leaving GHCi.