From 33beaba7c8b78e9d4908e98dd1d6b4e15c6ba6f8 Mon Sep 17 00:00:00 2001
From: Urgau <urgau@numericable.fr>
Date: Sun, 8 Jun 2025 20:36:47 +0200
Subject: [PATCH] Always consider `const _` items as live for dead code
 analysis

---
 compiler/rustc_passes/src/dead.rs                 | 13 ++++++++++++-
 .../dead-code/const-underscore-issue-142104.rs    | 15 +++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 tests/ui/lint/dead-code/const-underscore-issue-142104.rs

diff --git a/compiler/rustc_passes/src/dead.rs b/compiler/rustc_passes/src/dead.rs
index 6b82252f32c26..e597c819a3aae 100644
--- a/compiler/rustc_passes/src/dead.rs
+++ b/compiler/rustc_passes/src/dead.rs
@@ -22,7 +22,7 @@ use rustc_middle::ty::{self, TyCtxt};
 use rustc_middle::{bug, span_bug};
 use rustc_session::lint::builtin::DEAD_CODE;
 use rustc_session::lint::{self, LintExpectationId};
-use rustc_span::{Symbol, sym};
+use rustc_span::{Symbol, kw, sym};
 
 use crate::errors::{
     ChangeFields, IgnoredDerivedImpls, MultipleDeadCodes, ParentInfo, UselessAssignment,
@@ -793,6 +793,17 @@ fn check_item<'tcx>(
             // global_asm! is always live.
             worklist.push((id.owner_id.def_id, ComesFromAllowExpect::No));
         }
+        DefKind::Const => {
+            let item = tcx.hir_item(id);
+            if let hir::ItemKind::Const(ident, ..) = item.kind
+                && ident.name == kw::Underscore
+            {
+                // `const _` is always live, as that syntax only exists for the side effects
+                // of type checking and evaluating the constant expression, and marking them
+                // as dead code would defeat that purpose.
+                worklist.push((id.owner_id.def_id, ComesFromAllowExpect::No));
+            }
+        }
         _ => {}
     }
 }
diff --git a/tests/ui/lint/dead-code/const-underscore-issue-142104.rs b/tests/ui/lint/dead-code/const-underscore-issue-142104.rs
new file mode 100644
index 0000000000000..b255027e0f1ce
--- /dev/null
+++ b/tests/ui/lint/dead-code/const-underscore-issue-142104.rs
@@ -0,0 +1,15 @@
+//@ check-pass
+
+// This test makes sure we always considers `const _` items as live for dead code analysis.
+
+#![deny(dead_code)]
+
+const fn is_nonzero(x: u8) -> bool {
+    x != 0
+}
+
+const _: () = {
+    assert!(is_nonzero(2));
+};
+
+fn main() {}