1 files changed, 89 insertions, 0 deletions
diff --git a/src/test/ui/suggestions/derive-macro-missing-bounds.rs b/src/test/ui/suggestions/derive-macro-missing-bounds.rs
new file mode 100644
index 000000000..56c218f97
--- /dev/null
+++ b/src/test/ui/suggestions/derive-macro-missing-bounds.rs
@@ -0,0 +1,89 @@
+mod a {
+    use std::fmt::{Debug, Formatter, Result};
+    struct Inner<T>(T);
+
+    impl Debug for Inner<()> {
+        fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+            todo!()
+        }
+    }
+
+    #[derive(Debug)]
+    struct Outer<T>(Inner<T>); //~ ERROR `a::Inner<T>` doesn't implement `Debug`
+}
+
+mod b {
+    use std::fmt::{Debug, Formatter, Result};
+    struct Inner<T>(T);
+
+    impl<T: Debug> Debug for Inner<T> {
+        fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+            todo!()
+        }
+    }
+
+    #[derive(Debug)]
+    struct Outer<T>(Inner<T>);
+}
+
+mod c {
+    use std::fmt::{Debug, Formatter, Result};
+    struct Inner<T>(T);
+    trait Trait {}
+
+    impl<T: Debug + Trait> Debug for Inner<T> {
+        fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+            todo!()
+        }
+    }
+
+    #[derive(Debug)]
+    struct Outer<T>(Inner<T>); //~ ERROR the trait bound `T: c::Trait` is not satisfied
+}
+
+mod d {
+    use std::fmt::{Debug, Formatter, Result};
+    struct Inner<T>(T);
+    trait Trait {}
+
+    impl<T> Debug for Inner<T> where T: Debug, T: Trait {
+        fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+            todo!()
+        }
+    }
+
+    #[derive(Debug)]
+    struct Outer<T>(Inner<T>); //~ ERROR the trait bound `T: d::Trait` is not satisfied
+}
+
+mod e {
+    use std::fmt::{Debug, Formatter, Result};
+    struct Inner<T>(T);
+    trait Trait {}
+
+    impl<T> Debug for Inner<T> where T: Debug + Trait {
+        fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+            todo!()
+        }
+    }
+
+    #[derive(Debug)]
+    struct Outer<T>(Inner<T>); //~ ERROR the trait bound `T: e::Trait` is not satisfied
+}
+
+mod f {
+    use std::fmt::{Debug, Formatter, Result};
+    struct Inner<T>(T);
+    trait Trait {}
+
+    impl<T: Debug> Debug for Inner<T> where T: Trait {
+        fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+            todo!()
+        }
+    }
+
+    #[derive(Debug)]
+    struct Outer<T>(Inner<T>); //~ ERROR the trait bound `T: f::Trait` is not satisfied
+}
+
+fn main() {}