pub(crate) fn find_dots_param(
inputs: &Punctuated<FnArg, Comma>,
) -> Result<Option<Ident>>Expand description
Find the dots parameter of a signature by type, at any position, and return its Rust binding.
The parameter of type &Dots or LazyDots is R’s ... at its own
position: the R formals and the .Call() arguments follow the Rust
signature order, with ... where it sits (list(...) or environment()
in the call, DotsKind::r_call_arg), and every formal after it is
matched by exact name only, as R does for any formal after ....
A function takes at most one ..., so a second &Dots / LazyDots
parameter is an error spanned on it. The parameter needs a plain name: the
body reads the dots through it.