You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: iter_skip_next.rs
    path of file: ./repos/rust-clippy/clippy_lints/src/methods
    
    the code of the file until where you have to start completion: use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::source::snippet;
use clippy_utils::{is_trait_method, path_to_local};
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_hir::{BindingAnnotation, Node, PatKind};
use rustc_lint::LateContext;
use rustc_span::sym;

use super::ITER_S
    
pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>, arg: &hir::Expr<'_>) {
    // lint if caller of skip is an Iterator
    if is_trait_method(cx, expr, sym::Iterator) {
        let mut application = Applicability::MachineApplicable;
        span_lint_and_then(
            cx,
            ITER_SKIP_NEXT,
            expr.span.trim_start(recv.span).unwrap(),
            "called `skip(..).next()` on an iterator",
            |diag| {
                if let Some(id) = path_to_local(recv)
                    && let Node::Pat(pat) = cx.tcx.hir_node(id)
                    && let PatKind::Binding(ann, _, _, _) = pat.kind
                    && ann != BindingAnnotation::MUT
                {
                    application = Applicability::Unspecified;
                    diag.span_help(
                        pat.span,
                        format!("for this change `{}` has to be mutable", snippet(cx, pat.span, "..")),
                    );
                }

                diag.span_suggestion(
                    expr.span.trim_start(recv.span).unwrap(),
                    "use `nth` instead",
                    format!(".nth({})", snippet(cx, arg.span, "..")),
                    application,
                );
            },
        );
    }
}