| use clippy_utils::diagnostics::span_lint_and_sugg; |
| use clippy_utils::path_res; |
| use clippy_utils::source::snippet_opt; |
| use clippy_utils::ty::is_type_diagnostic_item; |
| use clippy_utils::usage::local_used_after_expr; |
| use rustc_errors::Applicability; |
| use rustc_hir::def::Res; |
| use rustc_hir::Expr; |
| use rustc_lint::LateContext; |
| use rustc_span::sym; |
| |
| use super::NEEDLESS_OPTION_AS_DEREF; |
| |
| pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, recv: &Expr<'_>, name: &str) { |
| let typeck = cx.typeck_results(); |
| let outer_ty = typeck.expr_ty(expr); |
| |
| if is_type_diagnostic_item(cx, outer_ty, sym::Option) && outer_ty == typeck.expr_ty(recv) { |
| if name == "as_deref_mut" && recv.is_syntactic_place_expr() { |
| let Res::Local(binding_id) = path_res(cx, recv) else { |
| return; |
| }; |
| |
| if local_used_after_expr(cx, binding_id, recv) { |
| return; |
| } |
| } |
| |
| span_lint_and_sugg( |
| cx, |
| NEEDLESS_OPTION_AS_DEREF, |
| expr.span, |
| "derefed type is same as origin", |
| "try", |
| snippet_opt(cx, recv.span).unwrap(), |
| Applicability::MachineApplicable, |
| ); |
| } |
| } |