1 files changed, 113 insertions, 0 deletions
diff --git a/tests/ui/suggestions/impl-on-dyn-trait-with-implicit-static-bound-needing-more-suggestions.rs b/tests/ui/suggestions/impl-on-dyn-trait-with-implicit-static-bound-needing-more-suggestions.rs
new file mode 100644
index 00000000000..711cbbd381a
--- /dev/null
+++ b/tests/ui/suggestions/impl-on-dyn-trait-with-implicit-static-bound-needing-more-suggestions.rs
@@ -0,0 +1,113 @@
+// FIXME: the following cases need to suggest more things to make users reach a working end state.
+
+mod bav {
+    trait OtherTrait<'a> {}
+    impl<'a> OtherTrait<'a> for &'a () {}
+
+    trait ObjectTrait {
+        type Assoc: Bar;
+    }
+    trait MyTrait {
+        fn use_self(&self) -> &() { panic!() }
+    }
+    trait Bar {}
+
+    impl MyTrait for Box<dyn ObjectTrait<Assoc = i32>> {
+        fn use_self(&self) -> &() { panic!() }
+    }
+    impl Bar for i32 {}
+
+    fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = i32>>) -> impl OtherTrait<'a> {
+        val.use_self() //~ ERROR cannot return reference to function parameter
+    }
+}
+
+mod bap {
+    trait OtherTrait<'a> {}
+    impl<'a> OtherTrait<'a> for &'a () {}
+
+    trait ObjectTrait {
+        type Assoc: Bar;
+    }
+    trait MyTrait {
+        fn use_self(&self) -> &() { panic!() }
+    }
+    trait Bar {}
+
+    impl MyTrait for Box<dyn ObjectTrait<Assoc = i32>> {
+        fn use_self(&self) -> &() { panic!() }
+    }
+    impl Bar for i32 {}
+
+    fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = i32>>) -> impl OtherTrait<'a> + 'a {
+        val.use_self() //~ ERROR E0515
+    }
+}
+
+// This case in particular requires the user to write all of the bounds we have in `mod bax`.
+mod bay {
+    trait OtherTrait<'a> {}
+    impl<'a> OtherTrait<'a> for &'a () {}
+
+    trait ObjectTrait {
+        type Assoc: Bar;
+    }
+    trait MyTrait {
+        fn use_self(&self) -> &() { panic!() }
+    }
+    trait Bar {}
+
+    impl MyTrait for Box<dyn ObjectTrait<Assoc = i32>> {
+        fn use_self(&self) -> &() { panic!() }
+    }
+    impl Bar for i32 {}
+
+    fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = i32> + 'a>) -> &'a () {
+        val.use_self()
+    }
+}
+
+mod bax {
+    trait OtherTrait<'a> {}
+    impl<'a> OtherTrait<'a> for &'a () {}
+
+    trait ObjectTrait {
+        type Assoc: Bar;
+    }
+    trait MyTrait<'a> {
+        fn use_self(&'a self) -> &'a () { panic!() }
+    }
+    trait Bar {}
+
+    impl<'a> MyTrait<'a> for Box<dyn ObjectTrait<Assoc = i32> + 'a> {
+        fn use_self(&'a self) -> &'a () { panic!() }
+    }
+    impl Bar for i32 {}
+
+    fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = i32> + 'a>) -> &'a () {
+        val.use_self()
+    }
+}
+
+mod baw {
+    trait OtherTrait<'a> {}
+    impl<'a> OtherTrait<'a> for &'a () {}
+
+    trait ObjectTrait {
+        type Assoc: Bar;
+    }
+    trait MyTrait {
+        fn use_self(&self) -> &() { panic!() }
+    }
+    trait Bar {}
+
+    impl<'a> MyTrait for Box<dyn ObjectTrait<Assoc = Box<dyn Bar>>> {
+        fn use_self(&self) -> &() { panic!() }
+    }
+
+    fn use_it<'a>(val: Box<dyn ObjectTrait<Assoc = Box<dyn Bar>>>) -> impl OtherTrait<'a> + 'a{
+        val.use_self() //~ ERROR E0515
+    }
+}
+
+fn main() {}