Increase accuracy of lifetime bound on trait object impl suggestion

src/test/ui/suggestions/impl-on-dyn-trait-with-implicit-static-bound.rs

@@ -9,10 +9,12 @@ mod foo {
     trait MyTrait {
         fn use_self(&self) -> &();
     }
+    trait Irrelevant {}
 
     impl MyTrait for dyn ObjectTrait {
         fn use_self(&self) -> &() { panic!() }
     }
+    impl Irrelevant for dyn ObjectTrait {}
 
     fn use_it<'a>(val: &'a dyn ObjectTrait) -> impl OtherTrait<'a> + 'a {
         val.use_self() //~ ERROR cannot infer an appropriate lifetime
@@ -24,14 +26,48 @@ mod bar {
     trait MyTrait {
         fn use_self(&self) -> &();
     }
+    trait Irrelevant {}
 
     impl MyTrait for dyn ObjectTrait {
         fn use_self(&self) -> &() { panic!() }
     }
+    impl Irrelevant for dyn ObjectTrait {}
 
     fn use_it<'a>(val: &'a dyn ObjectTrait) -> &'a () {
         val.use_self() //~ ERROR cannot infer an appropriate lifetime
     }
 }
 
+mod baz {
+    trait ObjectTrait {}
+    trait MyTrait {
+        fn use_self(&self) -> &();
+    }
+    trait Irrelevant {}
+
+    impl MyTrait for Box<dyn ObjectTrait> {
+        fn use_self(&self) -> &() { panic!() }
+    }
+    impl Irrelevant for Box<dyn ObjectTrait> {}
+
+    fn use_it<'a>(val: &'a Box<dyn ObjectTrait + 'a>) -> &'a () {
+        val.use_self() //~ ERROR cannot infer an appropriate lifetime
+    }
+}
+
+mod bat {
+    trait OtherTrait<'a> {}
+    impl<'a> OtherTrait<'a> for &'a () {}
+
+    trait ObjectTrait {}
+
+    impl dyn ObjectTrait {
+        fn use_self(&self) -> &() { panic!() }
+    }
+
+    fn use_it<'a>(val: &'a dyn ObjectTrait) -> impl OtherTrait<'a> + 'a {
+        val.use_self() //~ ERROR cannot infer an appropriate lifetime
+    }
+}
+
 fn main() {}