LocalSet does not require Send. https://docs.rs/tokio/latest/tokio/task/struct.LocalSet.html https://docs.rs/tokio/latest/tokio/task/struct.LocalSet.html EDIT:

LocalSet does not require Send. https://docs.rs/tokio/latest/tokio/task/struct.LocalSet.html https://docs.rs/tokio/latest/tokio/task/struct.LocalSet.html EDIT: Sorry to join in the multiple responses. Clarity for others: "current_thread" by itself does not relax Send, and many libraries aren't configurable to make everything use LocalSet.