Proposal to deprecate and then drop fromJust

[Henning Thielemann]

On Tue, 24 Feb 2015, Greg Weber wrote:

> Michael and I came up with an approach of using a convention in mono-traversable where any partial function
> has the postfix `Ex`, which stands for (throws a pure) Exception. So there is a `headEx` and `tailEx`
> function. This is a very light-weight solution although it is certainly easy for someone to ignore a new
> naming convention.

The only problem is, that "error" is not an exception, but, well, an 
error. Why not naming partial functions with something that reminds on 
"partial"?