1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/impl-trait-in-macro.rs b/tests/ui/impl-trait/impl-trait-in-macro.rs
new file mode 100644
index 00000000000..3165c9b9915
--- /dev/null
+++ b/tests/ui/impl-trait/impl-trait-in-macro.rs
@@ -0,0 +1,20 @@
+use std::fmt::Debug;
+
+macro_rules! i {
+    ($($tr:tt)*) => { impl $($tr)* };
+}
+
+fn foo(x: i!(Debug), y: i!(Debug)) -> String {
+    let mut a = x;
+    a = y; //~ ERROR mismatched
+    format!("{:?}", a)
+}
+
+trait S<T> {}
+
+fn much_universe<T: S<i!(Debug)>, U: IntoIterator<Item = i!(Iterator<Item = i!(Clone)>)>>(
+    _: i!(Debug + Clone),
+) {
+}
+
+fn main() {}