[Pre-pitch] SwiftPM Manifest based on Result Builders

[kiel (Kiel Gillard)]

I’m not sure that’s completely fair. Over at the Compile Time Constants pitch, this work could be a step towards improving the performance of SwiftPM:

@ArtemC

This means that for a category of simple packages where such expression of the package’s model is possible, the manifest does not need to be executed in a sandbox by the Package Manager - the required information can be extracted at manifest build time.

So maybe with less sandboxes, we might get some of that two-three minutes our Macs spend stuttering playing music, switching Slack channels or browsing web pages while trying resolving 30 or so package dependencies after a changing a branch