Trees that Grow and constraints

[Alan & Kim Zimmerman]

I have updated the page, with a bit more detail and an additional plan


> OK.  It’s hard to keep this straight in email. Take a look at
>>
>> https://ghc.haskell.org/trac/ghc/wiki/ImplementingTreesThatGrow/Instances
>>
>>
>>
>> Please edit and improve it.
>>
>>
Alan
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