// run-rustfix
// aux-build:paths.rs
#![deny(clippy::internal)]
#![feature(rustc_private)]

extern crate clippy_utils;
extern crate paths;
extern crate rustc_hir;
extern crate rustc_lint;
extern crate rustc_middle;
extern crate rustc_span;

#[allow(unused)]
use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item, match_type};
#[allow(unused)]
use clippy_utils::{
    is_expr_path_def_path, is_path_diagnostic_item, is_res_diagnostic_ctor, is_res_lang_ctor, is_trait_method,
    match_def_path, match_trait_method, path_res,
};

#[allow(unused)]
use rustc_hir::LangItem;
#[allow(unused)]
use rustc_span::sym;

use rustc_hir::def_id::DefId;
use rustc_hir::Expr;
use rustc_lint::LateContext;
use rustc_middle::ty::Ty;

#[allow(unused)]
static OPTION: [&str; 3] = ["core", "option", "Option"];
#[allow(unused)]
const RESULT: &[&str] = &["core", "result", "Result"];

fn _f<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, did: DefId, expr: &Expr<'_>) {
    let _ = is_type_diagnostic_item(cx, ty, sym::Option);
    let _ = is_type_diagnostic_item(cx, ty, sym::Result);
    let _ = is_type_diagnostic_item(cx, ty, sym::Result);

    #[allow(unused)]
    let rc_path = &["alloc", "rc", "Rc"];
    let _ = is_type_diagnostic_item(cx, ty, sym::Rc);

    let _ = is_type_diagnostic_item(cx, ty, sym::Option);
    let _ = is_type_diagnostic_item(cx, ty, sym::Result);

    let _ = is_type_lang_item(cx, ty, LangItem::OwnedBox);
    let _ = is_type_diagnostic_item(cx, ty, sym::maybe_uninit_uninit);

    let _ = cx.tcx.lang_items().require(LangItem::OwnedBox).ok() == Some(did);
    let _ = cx.tcx.is_diagnostic_item(sym::Option, did);
    let _ = cx.tcx.lang_items().require(LangItem::OptionSome).ok() == Some(did);

    let _ = is_trait_method(cx, expr, sym::AsRef);

    let _ = is_path_diagnostic_item(cx, expr, sym::Option);
    let _ = path_res(cx, expr).opt_def_id().map_or(false, |id| cx.tcx.lang_items().require(LangItem::IteratorNext).ok() == Some(id));
    let _ = is_res_lang_ctor(cx, path_res(cx, expr), LangItem::OptionSome);
}

fn main() {}