1 files changed, 8 insertions, 0 deletions
diff --git a/src/test/ui/feature-gates/allow-features.rs b/src/test/ui/feature-gates/allow-features.rs
new file mode 100644
index 000000000..2ce4701a8
--- /dev/null
+++ b/src/test/ui/feature-gates/allow-features.rs
@@ -0,0 +1,8 @@
+// compile-flags: -Z allow_features=lang_items
+// Note: This test uses rustc internal flags because they will never stabilize.
+
+#![feature(lang_items)]
+
+#![feature(unknown_stdlib_feature)] //~ ERROR
+
+fn main() {}