Simon Peyton Jones authored Dec 21, 2020 and Marge Bot committed Dec 24, 2020

Given a kind signature

   type T :: forall k. k -> forall k. k -> blah
   data T a b = ...

where those k's have the same unique (which is possible;
see #19093) we were giving the tyConBinders in tycon T the same
unique, which caused chaos.

Fix is simple: ensure uniqueness when decomposing the kind signature.
See GHC.Tc.Gen.HsType.zipBinders