I don't think it is surprising. Nested functions do not capture the return (and yield) continuation of their containing function, so they can't invoke it. Rust

I don't think it is surprising. Nested functions do not capture the return (and yield) continuation of their containing function, so they can't invoke it. Rust is in good company here and I think it is the right default for lambdas. In principle you could have a variant scoped function syntax that does that, but that will complicate both the language implementation and syntax