> Languages that use async/await do not require you to say "async" at the call site. Nope, but if you start calling an async function from within a non-async f

> Languages that use async/await do not require you to say "async" at the call site. Nope, but if you start calling an async function from within a non-async function, then that function now has to become async, and all of the callers of that function have to become async. This isn't a problem with the green threads approach.