[Clippy] Swap waker_clone_wake to use diagnostic item instead of path

Author: GnomedDev

compiler/rustc_span/src/symbol.rs

@@ -342,6 +342,7 @@ symbols! {
         Upvars,
         Vec,
         VecDeque,
+        Waker,
         Wrapper,
         Wrapping,
         Yield,

library/core/src/task/wake.rs

@@ -414,6 +414,7 @@ impl<'a> ContextBuilder<'a> {
 /// [`Wake`]: ../../alloc/task/trait.Wake.html
 #[repr(transparent)]
 #[stable(feature = "futures_api", since = "1.36.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "Waker")]
 pub struct Waker {
     waker: RawWaker,
 }

src/tools/clippy/clippy_lints/src/methods/waker_clone_wake.rs

@@ -1,6 +1,6 @@
 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 clippy_utils::is_trait_method;
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::LateContext;
@@ -12,7 +12,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, recv: &'
     let ty = cx.typeck_results().expr_ty(recv);
 
     if let Some(did) = ty.ty_adt_def()
-        && match_def_path(cx, did.did(), &paths::WAKER)
+        && cx.tcx.is_diagnostic_item(sym::Waker, did.did())
         && let ExprKind::MethodCall(_, waker_ref, &[], _) = recv.kind
         && is_trait_method(cx, recv, sym::Clone)
     {

src/tools/clippy/clippy_utils/src/paths.rs

@@ -73,4 +73,3 @@ pub const TOKIO_IO_OPEN_OPTIONS: [&str; 4] = ["tokio", "fs", "open_options", "Op
 #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
 pub const TOKIO_IO_OPEN_OPTIONS_NEW: [&str; 5] = ["tokio", "fs", "open_options", "OpenOptions", "new"];
 pub const INSTANT_NOW: [&str; 4] = ["std", "time", "Instant", "now"];
-pub const WAKER: [&str; 4] = ["core", "task", "wake", "Waker"];