1 files changed, 13 insertions, 0 deletions
diff --git a/tests/ui/diagnostic_namespace/feature-gate-diagnostic_namespace.rs b/tests/ui/diagnostic_namespace/feature-gate-diagnostic_namespace.rs
new file mode 100644
index 00000000000..a686ed9c84e
--- /dev/null
+++ b/tests/ui/diagnostic_namespace/feature-gate-diagnostic_namespace.rs
@@ -0,0 +1,13 @@
+#[diagnostic::non_existing_attribute]
+//~^ERROR `#[diagnostic]` attribute name space is experimental [E0658]
+//~|WARNING unknown diagnostic attribute [unknown_diagnostic_attributes]
+pub trait Bar {
+}
+
+#[diagnostic::non_existing_attribute(with_option = "foo")]
+//~^ERROR `#[diagnostic]` attribute name space is experimental [E0658]
+//~|WARNING unknown diagnostic attribute [unknown_diagnostic_attributes]
+struct Foo;
+
+fn main() {
+}