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Promise

It could be blocked until we solve the ownership problem.

Promise is the main object. async and await are syntax sugars. If we can safely work with promises, we can transform a FunctionalScript program with async functions into a normal function with Promises.

.then()

a.then(f)
const g0 = async(a) => f(await a)
// g0 = a => a.then(f)

const g1 = async(a) => f(await a)

const a = io.wrtieFile('a', 'x')
const p0 = g0(a)
const p1 = g1(a)