rust-lazy | Lazy Evaluation for Rust

You should use serde::de::DeserializeOwned instead of Deserialize<'a>.

The Deserialize trait takes a lifetime parameter to support zero-cost deserialization, but you can't take advantage of that since the source, resptxt, is a transient value that isn't persisted anywhere. The DeserializeOwned trait can be used to constrain that the deserialized type does not keep references to the source and can therefore be used beyond it.

After fixing that, you'll get errors that ReceiveType and SenderType must be 'static to be used in a tokio::spawn'd task. Adding that constraint finally makes your code compile.

See the full compiling code on the playground for brevity.