Rollup merge of #104383 - WaffleLapkin:rustc_undiagnostic_item, r=compiler-errors

Remove unused symbols and diagnostic items

As the title suggests, this removes unused symbols from `sym::` and `#[rustc_diagnostic_item]` annotations that weren't mentioned anywhere.

Originally I tried to use grep, to find symbols and item names that are never mentioned via `sym::name`, however this produced a lot of false positives (?), for example clippy matching on `Symbol::as_str` or macros "implicitly" adding `sym::`. I ended up fixing all these false positives (?) by hand, but tbh I'm not sure if it was worth it...

1 files changed, 6 insertions, 6 deletions

diff --git a/src/tools/clippy/clippy_utils/src/macros.rs b/src/tools/clippy/clippy_utils/src/macros.rs
index 9a682fbe604..d13b34a66cc 100644
--- a/src/tools/clippy/clippy_utils/src/macros.rs
+++ b/src/tools/clippy/clippy_utils/src/macros.rs
@@ -199,12 +199,12 @@ pub fn first_node_in_macro(cx: &LateContext<'_>, node: &impl HirNode) -> Option<
 pub fn is_panic(cx: &LateContext<'_>, def_id: DefId) -> bool {
     let Some(name) = cx.tcx.get_diagnostic_name(def_id) else { return false };
     matches!(
-        name.as_str(),
-        "core_panic_macro"
-            | "std_panic_macro"
-            | "core_panic_2015_macro"
-            | "std_panic_2015_macro"
-            | "core_panic_2021_macro"
+        name,
+        sym::core_panic_macro
+            | sym::std_panic_macro
+            | sym::core_panic_2015_macro
+            | sym::std_panic_2015_macro
+            | sym::core_panic_2021_macro
     )
 }