Reflection and comptime goal

[oli-obk]

With the renewed general interest in reflection via the facet crate coinciding with my own experiments with reflection, and some discussions with bevy folk at the all hands, I think that this may be a good time to pursue more language reflection capabilities than size_of and align_of.

Rendered

[fu5ha]

Wanted to point out mirror-mirror as another prior art. We made it at Embark Studios for use in our Rust game engine. It's similar to Bevy reflect in many ways, with the most interesting differences being

• An owned opaque Value type which can be interacted with thru the same reflection apis
• key paths as a more ergonomic way to query thru layers of a reflected type

[lqd]

I've added a fix in #312 for the CI failure -- as well as fixed a bug in the template that would still prevent validation without the suggested changes below.

[lqd]

IIUC "Tracking issue" is supposed to be the GH project goal issue where updates will be posted.

A r-l/r tracking issue instead could be:

• others have used the following

Suggested change

	| Tracking issue | https://github.com/rust-lang/rust/issues/142577 |
	| Other tracking issues | [rust-lang/rust#142577] |

• the "See also" metadata field is also documented and supposedly used to track progress with checkboxes and so on -- but I don't know if anyone has used it / tested to see if it works 😓

[oli-obk]

I'm currently working on making the errors meaningful to me 😆 then I can think about what else to do here

[lqd]

To be clear, the errors aren't meaningful to me either, I haven't worked in a lot of parts in this project.