Why can't compile time expressions do ___?

[Adam D. Ruppe via Digitalmars-d-learn]

On Saturday, 6 February 2016 at 22:13:55 UTC, cy wrote:
> I'm not clear on why you aren't allowed to allocate memory with 
> compile time execution

You can... use the built-in new operator or arrays, etc.

> or why access to the filesystem is restricted. (Unless you pass 
> -J/ I think?)

CTFE is a "pure" environment, it is supposed to only depend on 
the code and passed compile options (which may indeed include a 
path with -J that you are allowed to read files from). It doesn't 
actually run a complete program on the installed computer / OS, 
it just does some computations.

This is meant to be a security thing (which IMO is dubious) and a 
platform issue: D code can be compiled independently of an 
operating system.