From a9215d90c8c576e5f2afd1ef69c6f172229e021e Mon Sep 17 00:00:00 2001
From: kyoto7250 <50972773+kyoto7250@users.noreply.github.com>
Date: Thu, 16 Jun 2022 23:19:46 +0900
Subject: [PATCH] ignore item in thread_local!

---
 clippy_lints/src/non_copy_const.rs                | 13 ++++++++++---
 tests/ui/declare_interior_mutable_const/others.rs |  5 +++++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/clippy_lints/src/non_copy_const.rs b/clippy_lints/src/non_copy_const.rs
index b727105f6..66b346bea 100644
--- a/clippy_lints/src/non_copy_const.rs
+++ b/clippy_lints/src/non_copy_const.rs
@@ -6,6 +6,7 @@ use std::ptr;
 
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::in_constant;
+use clippy_utils::macros::macro_backtrace;
 use if_chain::if_chain;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
@@ -17,7 +18,7 @@ use rustc_middle::mir::interpret::{ConstValue, ErrorHandled};
 use rustc_middle::ty::adjustment::Adjust;
 use rustc_middle::ty::{self, Const, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
-use rustc_span::{InnerSpan, Span, DUMMY_SP};
+use rustc_span::{sym, InnerSpan, Span, DUMMY_SP};
 use rustc_typeck::hir_ty_to_ty;
 
 // FIXME: this is a correctness problem but there's no suitable
@@ -250,8 +251,14 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
     fn check_item(&mut self, cx: &LateContext<'tcx>, it: &'tcx Item<'_>) {
         if let ItemKind::Const(hir_ty, body_id) = it.kind {
             let ty = hir_ty_to_ty(cx.tcx, hir_ty);
-
-            if is_unfrozen(cx, ty) && is_value_unfrozen_poly(cx, body_id, ty) {
+            if !macro_backtrace(it.span).last().map_or(false, |macro_call| {
+                matches!(
+                    cx.tcx.get_diagnostic_name(macro_call.def_id),
+                    Some(sym::thread_local_macro)
+                )
+            }) && is_unfrozen(cx, ty)
+                && is_value_unfrozen_poly(cx, body_id, ty)
+            {
                 lint(cx, Source::Item { item: it.span });
             }
         }
diff --git a/tests/ui/declare_interior_mutable_const/others.rs b/tests/ui/declare_interior_mutable_const/others.rs
index 48c5e9537..62af545db 100644
--- a/tests/ui/declare_interior_mutable_const/others.rs
+++ b/tests/ui/declare_interior_mutable_const/others.rs
@@ -31,4 +31,9 @@ const NO_ANN: &dyn Display = &70;
 static STATIC_TUPLE: (AtomicUsize, String) = (ATOMIC, STRING);
 //^ there should be no lints on this line
 
+// issue #8493
+thread_local! {
+    static THREAD_LOCAL: Cell<i32> = const { Cell::new(0) };
+}
+
 fn main() {}