Core WG notes for 2020-09-04

[lschuermann]

Pull Request Overview

This pull request adds the core WG call notes of September 4th, 2020.

Apologies for the delay. The discussion around system call return values was quite involved, I hope to have accredited each point accurately.

Testing Strategy

This pull request was tested by a spell checker.

TODO or Help Wanted

N/A

Documentation Updated

• Updated the relevant files in /docs, or no updates are required.

Formatting

• N/A Ran make prepush.

[lschuermann]

The terminology used throughout the document was sometimes confusing, particularly when talking about the return type (variant, PL type, number of fields, return signature, etc.). I have taken the liberty to replace some of those terms (where they were particularly confusing) with variant, in relation to Rust's enum variants, which also seems like the most likely implementation for the return value of functions in the Driver-trait.