Investigate the use of discriminated union in lieu of ActionResult<T>

[pranavkm]

The feature is still in proposal but if it lands, we should investigate replacing ActionResult<T> with a compiler feature.

Current spec: https://github.com/dotnet/csharplang/blob/master/proposals/discriminated-unions.md

[ghost]

Thanks for contacting us.
We're moving this issue to the Next sprint planning milestone for future evaluation / consideration. Because it's not immediately obvious that this is a bug in our framework, we would like to keep this around to collect more feedback, which can later help us determine the impact of it. We will re-evaluate this issue, during our next planning meeting(s).
If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues.
To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.

[pranavkm]

Closing this. The feature isn't planned for C# 10. We can file a new issue at a later date.