Overflow evaluation with recursive types and Box

[NicolasLagaillardie]

I have issues with "overflow evalution" with recursive enum types, but only when I start a variant with a Sender containing either a Receiver or a Sender, which also contains a Receiver or a Sender. You can see the playground here: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=5343c9bc10329a804d43ef1493527e38.
As you can see in this playground, when I start with a Receiver, I do not have any compilation issue.
Also, if I swap Sender/Receiver with their payload, I do not have the issue, as you can see in this playground: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=7b946d0b6d04557ff648659edf0773ee.

How can this be possible and how can I solve this?

[abique]

I had this issue as well.
I was creating a context with some rtrb queues as well as a blocking one.
I had to put that object into a box to workaround this problem.
Reallllllyyyyyy strannnnnngeeeeeee.