It’s because I want a set of “ambient” packages to use in GHCi at any time without having a source file. For example, imagine you want to check if you’re remembering Gauss’s formula correctly. I find it convenient to just be able to type ghci from anywhere and then do import Test.QuickCheck and quickCheck $ \n -> n >= 0 ==> sum [1..n] === n * (n + 1) `div` 2.
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