> stackless async support is suitable for systems like microcontrollers, and the design reflects that.

Tangent: How feasible would it be to have a language where the required stack space for all function invocations is statically known at compile time, just as the sizes of Rust futures are statically known? I guess this would be even harder, because with async functions, the compiler only has to store the state of the function in a statically sized structure when it reaches an await point. But I'm guessing that running out of stack is a common problem when developing for microcontrollers.