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Commit 40a31b38 authored by Simon Peyton Jones's avatar Simon Peyton Jones Committed by Ben Gamari
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Fix SigTvs at the kind level 

This patch fixes two bugs in the treatment of SigTvs at the
kind level:

- We should always generalise them, never default them
  (Trac #14555, #14563)

- We should check if they get unified with each other
  (Trac #11203)

Both are described in TcHsType
   Note [Kind generalisation and SigTvs]

(cherry picked from commit 8361b2c5)
parent dfe049fd
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