1 use clippy_utils::diagnostics::span_lint_and_sugg;
2 use clippy_utils::{is_diag_item_method, is_diag_trait_item};
3 use if_chain::if_chain;
4 use rustc_errors::Applicability;
6 use rustc_lint::LateContext;
7 use rustc_middle::ty::TyS;
8 use rustc_span::{sym, Span};
10 use super::IMPLICIT_CLONE;
12 pub fn check(cx: &LateContext<'_>, method_name: &str, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>, span: Span) {
14 if let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
15 if match method_name {
16 "to_os_string" => is_diag_item_method(cx, method_def_id, sym::OsStr),
17 "to_owned" => is_diag_trait_item(cx, method_def_id, sym::ToOwned),
18 "to_path_buf" => is_diag_item_method(cx, method_def_id, sym::Path),
19 "to_vec" => cx.tcx.impl_of_method(method_def_id)
20 .map(|impl_did| Some(impl_did) == cx.tcx.lang_items().slice_alloc_impl())
24 let return_type = cx.typeck_results().expr_ty(expr);
25 let input_type = cx.typeck_results().expr_ty(recv).peel_refs();
26 if let Some(ty_name) = input_type.ty_adt_def().map(|adt_def| cx.tcx.item_name(adt_def.did));
27 if TyS::same_type(return_type, input_type);
33 &format!("implicitly cloning a `{}` by calling `{}` on its dereferenced type", ty_name, method_name),
36 Applicability::MachineApplicable