I'm actually not certain why this output has changed:
  
-      Code: case reverse "no" of [] -> return (GHC.Base.[])
+      Code: let
+	      return = return
+	      $dMonad = Language.Haskell.TH.Syntax.$f22
+	    in case reverse "no" of [] -> return (GHC.Base.[])

  Perhaps it's something to do with inlining?
  
  Anyway it's not too important, because this stuff is only displayed
  for TH splices that crash with (head []) or something like that.