TypeScript Version: 2.2.0-dev.20161127

Code

declare var keyPrototype: any
declare function getKeyData(): Promise<{ key: any }>

async function getKey () {
  const { key } = {
    key: {
      ...keyPrototype
    },
    ...await getKeyData()
  }
  return key
}

Expected behavior:

Code to typecheck. The resulting key const should be a shallow copy of keyPrototype, with certain keys overridden by the result of getKeyData.

Actual behavior:

Error on the key declaration inside const { key }: "Initializer provides no value for this binding element and the binding element has no default value", despite the RHS being guaranteed to always have a key key.