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: utils.rs
    path of file: ./repos/rust-clippy/clippy_lints/src/loops
    
    the code of the file until where you have to start completion: use clippy_utils::ty::{has_iter_method, implements_trait};
use clippy_utils::{get_parent_expr, is_integer_const, path_to_local, path_to_local_id, sugg};
use rustc_ast::ast::{LitIntType, LitKind};
use rustc_errors::Applicability;
use rustc_hir::intravisit::{walk_expr, walk_local, walk_pat, walk_stmt, Visitor};
use rustc_hir::{BinOpKind, BorrowKind
    
    fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
        if matches!(self.state, InitializeVisitorState::DontWarn) {
            return;
        }
        if expr.hir_id == self.end_expr.hir_id {
            self.past_loop = true;
            return;
        }
        // No need to visit expressions before the variable is
        // declared
        if matches!(self.state, InitializeVisitorState::Initial) {
            return;
        }

        // If node is the desired variable, see how it's used
        if path_to_local_id(expr, self.var_id) {
            if self.past_loop {
                self.state = InitializeVisitorState::DontWarn;
                return;
            }

            if let Some(parent) = get_parent_expr(self.cx, expr) {
                match parent.kind {
                    ExprKind::AssignOp(_, lhs, _) if lhs.hir_id == expr.hir_id => {
                        self.state = InitializeVisitorState::DontWarn;
                    },
                    ExprKind::Assign(lhs, rhs, _) if lhs.hir_id == expr.hir_id => {
                        self.state = if self.depth == 0 {
                            match self.state {
                                InitializeVisitorState::Declared(name, mut ty) => {
                                    if ty.is_none() {
                                        if let ExprKind::Lit(Spanned {
                                            node: LitKind::Int(_, LitIntType::Unsuffixed),
                                            ..
                                        }) = rhs.kind
                                        {
                                            ty = None;
                                        } else {
                                            ty = self.cx.typeck_results().expr_ty_opt(rhs);
                                        }
                                    }

                                    InitializeVisitorState::Initialized {
                                        initializer: rhs,
                                        ty,
                                        name,
                                    }
                                },
                                InitializeVisitorState::Initialized { ty, name, .. } => {
                                    InitializeVisitorState::Initialized {
                                        initializer: rhs,
                                        ty,
                                        name,
                                    }
                                },
                                _ => InitializeVisitorState::DontWarn,
                            }
                        } else {
                            InitializeVisitorState::DontWarn
                        }
                    },
                    ExprKind::AddrOf(BorrowKind::Ref, Mutability::Mut, _) => {
                        self.state = InitializeVisitorState::DontWarn;
                    },
                    _ => (),
                }
            }

            walk_expr(self, expr);
        } else if !self.past_loop && is_loop(expr) {
            self.state = InitializeVisitorState::DontWarn;
        } else if is_conditional(expr) {
            self.depth += 1;
            walk_expr(self, expr);
            self.depth -= 1;
        } else {
            walk_expr(self, expr);
        }
    }