SE-0340: Unavailable From Async Attribute

[masters3d (Chéyo Jiménez)]

+1 for the feature.

I would suggest using nonasync following https://github.com/apple/swift-evolution/blob/main/proposals/0097-negative-attributes.md

Edit: that proposal was rejected but we still ended up renaming noescape to nonescaping

[Rejected] SE-0097: Normalizing naming for "negative" attributes

Proposal link: swift-evolution/0097-negative-attributes.md at master · apple/swift-evolution · GitHub Hello Swift Community, The review of SE-0097: "Normalizing naming for "negative" attributes" ran from May 24…30, 2016. The proposal is *rejected* for Swift 3. The core team agrees with the principle guiding the proposal (that negative attributes should start with “non” instead of “no”) and highly values standardized naming for attributes. The community was lukewarm about “nonescaping” but pr…