Why is one d file compiled into two files object file & executable.

[Kagamin via Digitalmars-d-learn]

On Wednesday, 11 February 2015 at 08:49:40 UTC, Andre Artus wrote:
> First to  mind is that in Java .class files are executable (in 
> Java runtime), while object files are not.

There was a library, which could load object files with D code, 
resolve symbols and execute it.