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diff --git a/src/test/ui/traits/object-does-not-impl-trait.rs b/src/test/ui/traits/object-does-not-impl-trait.rs
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+++ b/src/test/ui/traits/object-does-not-impl-trait.rs
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+// Test that an object type `Box<Foo>` is not considered to implement the
+// trait `Foo`. Issue #5087.
+
+trait Foo {}
+fn take_foo<F:Foo>(f: F) {}
+fn take_object(f: Box<dyn Foo>) { take_foo(f); }
+//~^ ERROR `Box<dyn Foo>: Foo` is not satisfied
+fn main() {}