D is our last hope

[Richard (Rikki) Andrew Cattermole]

On 22/12/2023 12:04 PM, Walter Bright wrote:
> On 12/21/2023 7:13 AM, Siarhei Siamashka wrote:
>> Its main selling point is the compilation speed. However the 
>> out-of-the-box performance of `rdmd helloworld.d` is very far from 
>> perfect and looks inferior compared to `go run helloworld.go`. 
> 
> It's a good point. One of the likely suspects is object.d. It started 
> out as a small, single file. But it has bloated up to biblical 
> proportions, which have to be compiled by every separately compiled D 
> module. (If all the modules to a project are presented on the same 
> command line, object.d only gets compiled once, and that effort is 
> amortized over the other modules.)
> 
> For example, object.d has unit tests in it. Unit tests are a great 
> feature of D, but there they are in the wrong place. object.d should be 
> split into object.d and object.di. The unit tests and definitions go in 
> object.d, the declarations go in object.di.

I want to see a significant chunk of object.d removed.

I have a proposal on how to proceed on this, I have already talked with 
Adam Wilson about it, so even if you don't hear from me directly you'll 
hear from him about it ;)

This isn't just for speeding imports up, it will also help custom 
druntime implementers quite significantly (as in, they'll stop 
complaining entirely).