Array is defined in the Swift standard library, but the compiler knows about the type directly, and also recognizes various @_semantics("array.blah") annotation

Array is defined in the Swift standard library, but the compiler knows about the type directly, and also recognizes various @_semantics("array.blah") annotations that appear in the standard library source code. I believe the semantics annotations are primarily to help the optimizer. https://github.com/apple/swift/blob/main/stdlib/public/core/Array.swift https://github.com/apple/swift/blob/main/stdlib/public/core/...