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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::{match_def_path, paths};
+use clippy_utils::{is_trait_method, match_def_path, paths};
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::LateContext;
@@ -13,10 +13,11 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, recv: &'
 
     if let Some(did) = ty.ty_adt_def()
         && match_def_path(cx, did.did(), &paths::WAKER)
-        && let ExprKind::MethodCall(func, waker_ref, &[], _) = recv.kind
-        && func.ident.name == sym::clone
+        && 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,
@@ -24,10 +25,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, recv: &'
             expr.span,
             "cloning a `Waker` only to wake it",
             "replace with",
-            format!(
-                "{}.wake_by_ref()",
-                snippet_with_applicability(cx, waker_ref.span, "..", &mut applicability)
-            ),
+            format!("{snippet}.wake_by_ref()"),
             applicability,
         );
     }

tests/ui/waker_clone_wake.fixed

@@ -5,18 +5,25 @@ impl Custom {
     pub fn wake(self) {}
 }
 
+macro_rules! mac {
+    ($cx:ident) => {
+        $cx.waker()
+    };
+}
+
 pub fn wake(cx: &mut std::task::Context) {
     cx.waker().wake_by_ref();
 
-    // We don't do that for now
+    mac!(cx).wake_by_ref();
+}
+
+pub fn no_lint(cx: &mut std::task::Context, c: &Custom) {
+    c.clone().wake();
+
     let w = cx.waker().clone();
     w.wake();
 
     cx.waker().clone().wake_by_ref();
 }
 
-pub fn no_lint(c: &Custom) {
-    c.clone().wake()
-}
-
 fn main() {}

tests/ui/waker_clone_wake.rs

@@ -5,18 +5,25 @@ impl Custom {
     pub fn wake(self) {}
 }
 
+macro_rules! mac {
+    ($cx:ident) => {
+        $cx.waker()
+    };
+}
+
 pub fn wake(cx: &mut std::task::Context) {
     cx.waker().clone().wake();
 
-    // We don't do that for now
+    mac!(cx).clone().wake();
+}
+
+pub fn no_lint(cx: &mut std::task::Context, c: &Custom) {
+    c.clone().wake();
+
     let w = cx.waker().clone();
     w.wake();
 
     cx.waker().clone().wake_by_ref();
 }
 
-pub fn no_lint(c: &Custom) {
-    c.clone().wake()
-}
-
 fn main() {}

tests/ui/waker_clone_wake.stderr

@@ -1,5 +1,5 @@
 error: cloning a `Waker` only to wake it
-  --> $DIR/waker_clone_wake.rs:9:5
+  --> $DIR/waker_clone_wake.rs:15:5
    |
 LL |     cx.waker().clone().wake();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `cx.waker().wake_by_ref()`
@@ -7,5 +7,11 @@ LL |     cx.waker().clone().wake();
    = note: `-D clippy::waker-clone-wake` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::waker_clone_wake)]`
 
-error: aborting due to previous error
+error: cloning a `Waker` only to wake it
+  --> $DIR/waker_clone_wake.rs:17:5
+   |
+LL |     mac!(cx).clone().wake();
+   |     ^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `mac!(cx).wake_by_ref()`
+
+error: aborting due to 2 previous errors