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-rw-r--r--src/test/ui/on-unimplemented/issue-104140.rs8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/test/ui/on-unimplemented/issue-104140.rs b/src/test/ui/on-unimplemented/issue-104140.rs
new file mode 100644
index 000000000..ade3f7270
--- /dev/null
+++ b/src/test/ui/on-unimplemented/issue-104140.rs
@@ -0,0 +1,8 @@
+#![feature(rustc_attrs)]
+
+trait Foo {}
+
+#[rustc_on_unimplemented] //~ ERROR malformed `rustc_on_unimplemented` attribute input
+impl Foo for u32 {}
+
+fn main() {}