Proposal: Add HasCallStack to the partial functions in base

[Henning Thielemann]

On Thu, 27 Sep 2018, David Feuer wrote:

> I mostly think this is a good idea. However, some care is required to prevent performance problems, especially in
> recursive functions. Watch out in implementation! Also, these partial functions are sometimes used in
> non-obviously total contexts, such as the implementation of mfix for lists.

All partial functions must eventually be used in total contexts - 
otherwise your program can crash.