Function has_dispatch_dots 

fn has_dispatch_dots(class_system: ClassSystem, m: &ParsedMethod) -> bool

Whether the class system gives m’s R wrapper a ... formal the Rust method doesn’t take: the dispatch ... of an S3, S4 or S7 instance method (unless no_dispatch_dots / s7(no_dots)), and of a vctrs protocol method. Env and R6 methods and every other static method have only the formals of the Rust signature.