1 files changed, 14 insertions, 0 deletions
diff --git a/tests/ui/macros/unknown-builtin.rs b/tests/ui/macros/unknown-builtin.rs
new file mode 100644
index 000000000..16f9139e6
--- /dev/null
+++ b/tests/ui/macros/unknown-builtin.rs
@@ -0,0 +1,14 @@
+// error-pattern: attempted to define built-in macro more than once
+
+#![feature(rustc_attrs)]
+
+#[rustc_builtin_macro]
+macro_rules! unknown { () => () } //~ ERROR cannot find a built-in macro with name `unknown`
+
+#[rustc_builtin_macro]
+macro_rules! line { () => () } //~ NOTE previously defined here
+
+fn main() {
+    line!();
+    std::prelude::v1::line!();
+}