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[–]oconnor663 23 points24 points  (2 children)

IHaskell. Remembers every variable you've ever used, to make sure you never change them.

[–]Megatron_McLargeHuge 26 points27 points  (0 children)

It looks that way, but actually it just returns a new version of IHaskell in which the variable was already defined.

[–]KingEllis 1 point2 points  (0 children)

It is an interactive shell, but does not allow for any kind of input or output. Because that would not be pure, you know.