std.experimental.logger formal review round 3

[Robert burner Schadek via Digitalmars-d]

On Friday, 14 November 2014 at 23:40:21 UTC, David Nadlinger 
wrote:
> On Friday, 14 November 2014 at 22:18:41 UTC, Robert burner 
> Schadek wrote:
>> Yes, but this way allows to add structured logging in an easy 
>> way.
>
> What.

The actual log call is split into multiple parts so that the user 
can overload logMsgPart and add, for instance, structured 
logging. In order to not have races with the default impl locking 
was added.