1 files changed, 9 insertions, 0 deletions
diff --git a/tests/ui/feature-gates/duplicate-features.rs b/tests/ui/feature-gates/duplicate-features.rs
new file mode 100644
index 00000000000..d8f7818054a
--- /dev/null
+++ b/tests/ui/feature-gates/duplicate-features.rs
@@ -0,0 +1,9 @@
+#![allow(stable_features)]
+
+#![feature(rust1)]
+#![feature(rust1)] //~ ERROR the feature `rust1` has already been declared
+
+#![feature(if_let)]
+#![feature(if_let)] //~ ERROR the feature `if_let` has already been declared
+
+fn main() {}