| use clippy_utils::diagnostics::span_lint_and_sugg; |
| use clippy_utils::source::snippet_with_applicability; |
| use clippy_utils::{is_trait_method, match_def_path, paths}; |
| use rustc_errors::Applicability; |
| use rustc_hir::{Expr, ExprKind}; |
| use rustc_lint::LateContext; |
| use rustc_span::sym; |
| |
| use super::WAKER_CLONE_WAKE; |
| |
| pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, recv: &'tcx Expr<'_>) { |
| let ty = cx.typeck_results().expr_ty(recv); |
| |
| if let Some(did) = ty.ty_adt_def() |
| && match_def_path(cx, did.did(), &paths::WAKER) |
| && let ExprKind::MethodCall(_, waker_ref, &[], _) = recv.kind |
| && is_trait_method(cx, recv, sym::Clone) |
| { |
| let mut applicability = Applicability::MachineApplicable; |
| let snippet = snippet_with_applicability(cx, waker_ref.span.source_callsite(), "..", &mut applicability); |
| |
| span_lint_and_sugg( |
| cx, |
| WAKER_CLONE_WAKE, |
| expr.span, |
| "cloning a `Waker` only to wake it", |
| "replace with", |
| format!("{snippet}.wake_by_ref()"), |
| applicability, |
| ); |
| } |
| } |