Meta-issue for discussion of the proposal to make async functions start synchronously

[leafpetersen]

This issue is to provide a forum for community discussion and feedback related to the proposal to make async functions start their execution synchronously.

Currently invoking an async function delays running the function body until a later microtask. This has been a source of bugs when converting synchronous functions to being async. This change would make the async function run until the first asynchronous operation (await, await-for) before returning the future.
This does not affect async* functions.

This entry will be updated when a proposal is available.

cc @munificent @eernstg @floitschG @lrhn

[srawlins]

This landed in the VM in 2.0.0-dev.61.0, DDC in 2.0.0-dev.52.0, and dart2js in 2.0.0-dev.51.0.

Its progress does not appear to be tracked in this issue, nor is there any discussion or feedback here. sync-async is here to stay. :)