1 files changed, 7 insertions, 0 deletions
diff --git a/tests/rustdoc/constant/const-underscore.rs b/tests/rustdoc/constant/const-underscore.rs
new file mode 100644
index 00000000000..fafc4b4e25c
--- /dev/null
+++ b/tests/rustdoc/constant/const-underscore.rs
@@ -0,0 +1,7 @@
+//@ compile-flags: --document-private-items
+
+//@ !has const_underscore/constant._.html
+const _: () = {
+    #[no_mangle]
+    extern "C" fn implementation_detail() {}
+};