Function t_list_set_elt 

pub unsafe extern "C-unwind" fn t_list_set_elt<T: AltList>(
    x: SEXP,
    i: R_xlen_t,
    v: SEXP,
)

Trampoline for list Set_elt method.

Safety

x must be a valid ALTREP VECSXP and v a valid SEXP.