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-rw-r--r--tests/ui/feature-gates/allow-features.rs8
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diff --git a/tests/ui/feature-gates/allow-features.rs b/tests/ui/feature-gates/allow-features.rs
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index 000000000..2ce4701a8
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+++ b/tests/ui/feature-gates/allow-features.rs
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+// 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() {}