Simon Peyton Jones authored Feb 15, 2019 and Marge Bot committed Feb 17, 2019

Following a succession of refactorings of the type checker,
culminating in the patch
       Make a smart mkAppTyM
we have got rid of mkNakedAppTy etc.  And that in turn
meant that the tcm_smart field of the generic TyCoMapper
(in Type.hs) was entirely unused.  It was always set to True.

So this patch just gets rid of it completely.  Less code,
less complexity, and more efficient because fewer higher-order
function calls.  Everyone wins.

No change in behaviour; this does not cure any bugs!