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I'm not sure async await was as much in the limelight at the start of development on swift, but I could be wrong.

• ygra 8y ago
  It's been part of F# since 2007 and C# since 2013, so the feature was probably known at design time of the language. However, language design is always a complicated dance of trade-offs, so there's never a way to initially account for all features that are eventually desired and implemented.