From 36c22f7cf7a7070c9c6b478406f9b2ba831560c6 Mon Sep 17 00:00:00 2001
From: jumpiix <david@unterguggenberger.ch>
Date: Mon, 23 Mar 2026 13:08:12 +0100
Subject: [PATCH] Add test for dead code warnings in const _

Tests that dead code warnings work correctly inside const _ blocks.
Issue was already fixed, adding regression test as requested.
---
 .../const-underscore-issue-101532.rs          | 14 ++++++++
 .../const-underscore-issue-101532.stderr      | 32 +++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 tests/ui/lint/dead-code/const-underscore-issue-101532.rs
 create mode 100644 tests/ui/lint/dead-code/const-underscore-issue-101532.stderr

diff --git a/tests/ui/lint/dead-code/const-underscore-issue-101532.rs b/tests/ui/lint/dead-code/const-underscore-issue-101532.rs
new file mode 100644
index 0000000000000..4dc25fbbecea9
--- /dev/null
+++ b/tests/ui/lint/dead-code/const-underscore-issue-101532.rs
@@ -0,0 +1,14 @@
+//@ check-pass
+// Test for issue #101532 - dead code warnings should work inside const _
+
+#![warn(dead_code)]
+
+const _: () = {
+    let a: ();
+    struct B {} //~ WARN struct `B` is never constructed
+    enum C {}   //~ WARN enum `C` is never used
+    fn d() {}   //~ WARN function `d` is never used
+    const E: () = {}; //~ WARN constant `E` is never used
+};
+
+fn main() {}
diff --git a/tests/ui/lint/dead-code/const-underscore-issue-101532.stderr b/tests/ui/lint/dead-code/const-underscore-issue-101532.stderr
new file mode 100644
index 0000000000000..d330b9e9f40a4
--- /dev/null
+++ b/tests/ui/lint/dead-code/const-underscore-issue-101532.stderr
@@ -0,0 +1,32 @@
+warning: struct `B` is never constructed
+  --> $DIR/const-underscore-issue-101532.rs:8:12
+   |
+LL |     struct B {}
+   |            ^
+   |
+note: the lint level is defined here
+  --> $DIR/const-underscore-issue-101532.rs:4:9
+   |
+LL | #![warn(dead_code)]
+   |         ^^^^^^^^^
+
+warning: enum `C` is never used
+  --> $DIR/const-underscore-issue-101532.rs:9:10
+   |
+LL |     enum C {}
+   |          ^
+
+warning: function `d` is never used
+  --> $DIR/const-underscore-issue-101532.rs:10:8
+   |
+LL |     fn d() {}
+   |        ^
+
+warning: constant `E` is never used
+  --> $DIR/const-underscore-issue-101532.rs:11:11
+   |
+LL |     const E: () = {};
+   |           ^
+
+warning: 4 warnings emitted
+