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When producing a type heap profile (-hy) from a Haskell program, I get these results:

ReaderT
->ReadertT
->>*
(,)
->(#,#)

What is the meaning of the '->' prefix (with one or more '>'), the '*' or the '#' here?

Chatanga
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    Yikes. That looks like the result of an untested pretty-printer to me. I definitely think that could and probably should be improved. If you're up for taking a shot at it, I suspect GHCHQ would be more than happy to point you at the right place in the enormouse codebase that is GHC, or at least narrow it down to a manageable subset of the whole codebase. – Daniel Wagner Jun 14 '21 at 21:45

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