Why is mangling different for separate compilation?

[Joakim via Digitalmars-d]

On Saturday, 27 February 2016 at 11:27:39 UTC, Walter Bright 
wrote:
> On 2/27/2016 1:12 AM, Atila Neves wrote:
>> I've had similar problems in the past with template mixins. It 
>> seems D's
>> compile-time features don't mix with any kind of separate 
>> compilation, which is
>> a shame.
>
> Any ideas on how unit tests should be named?

Why has the additional count been added?  You're already using 
the line number to differentiate unit test blocks.  For unit test 
blocks that are all on one line? ;)