https://twitter.com/Catfish_Man/status/1085680878175449089

3:03 AM

https://github.com/apple/swift/pull/21933

Use stack allocation for Swift closures by aschwaighofer · Pull R...

Adds an on_stack version of partial_apply It does not take ownership of its non-trivial arguments, is a trivial function type and therefore must not be destroyed. The compiler must make sure to ext...