1 files changed, 12 insertions, 0 deletions
diff --git a/tests/ui/lang-items/lang-item-unknown-definition-error.rs b/tests/ui/lang-items/lang-item-unknown-definition-error.rs
new file mode 100644
index 00000000000..22812128c2d
--- /dev/null
+++ b/tests/ui/lang-items/lang-item-unknown-definition-error.rs
@@ -0,0 +1,12 @@
+//! Checks that compiler prevernt attempting to define an unrecognized or unknown lang item
+
+#![allow(unused)]
+#![feature(lang_items)]
+
+#[lang = "foo"]
+fn bar() -> ! {
+    //~^^ ERROR definition of an unknown lang item: `foo`
+    loop {}
+}
+
+fn main() {}