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by chowells 1803 days ago
There was a bug in ghci (the GHC REPL) for a while which made it take exponential time to print the type of `id id id id id id id id id`. It used the linear representation for type-checking, but the pretty-printer was not implemented so cleverly.

Apparently that's been fixed. I can't confirm because that's not something I ever check the type of.