try/catch idiom in std.datetime

[Walter Bright]

On 11/20/2013 12:23 PM, Jonathan M Davis wrote:
> So, while some cases are clearly objectively bad (e.g. all of the code on one
> line), I think that you're going to have a hard time arguing it objectively in
> most cases - especially when it comes to legibility, since different people find
> different styles to be more legible, and what's more legible often comes down
> to what you're used to seeing rather than anything particularly objective.

Legibility can be objective, too.

For example, it is a fact that many fonts do not distinguish O and 0, l and 1. 
It is an objective fact that people have trouble distinguishing them. The JSF 
C++ coding standard, for example, prohibits using an "l" suffix on integral 
literals for that reason.

It's also an objective fact that people have trouble distinguishing:

     verylongisanidentifier

from:

     verulongsianidentifier

It's not just tomayto-tomahto. Human factors research shows that some designs 
are objectively better than others.