Help on tuple section in TH

[Yotam Ohad]

Hello,

I'm a wannabe ghc contributor on my first patch. I'm trying to do #15843
and I would like some help.
I understand that I need to change repE in DsMeta.hs
An explanation of the type signatures and the types would be very helpful.
Also, What does repLEs do?

Thanks for your help

Yotam
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