duplicates:

• SR-5719 Ban autoclosure forwarding

Issue Description:

Example of incorrect behavior:

func foo(_ fn: @autoclosure () -> Int) {}
func bar(_ fn: @autoclosure () -> Int) {
  foo(fn) // @autoclosure forwarding
}

This forwarding behavior shouldn't be allowed and was a consequence of function types having @autoclosure flags and various scattered checks in type-checker.

Only parameter declarations should be aware of @autoclosure, unlike @escaping which belongs to a function type itself.