Joachim Breitner authored Aug 23, 2021 and Marge Bot committed Oct 15, 2021

a number of functions exported by this module are (no longer) used, so
let’s remove them.

In particular, it no longer seems to be the case that type variables
have tag `'t'`, so removed the special handling when showing them.

* the use of `initTyVarUnique` was removed in 7babb1 (with the notable
  commit message of "Before merging to HEAD we need to tidy up and write
  a proper commit message.")
* `mkPseudoUniqueD`and `mkPseudoUniqueH` were added in 423d477b, but never ever used?
* `mkCoVarUnique` was added in 674654, but never ever used?