1 files changed, 14 insertions, 0 deletions
diff --git a/tests/ui/generics/duplicate-generic-parameter-error-86756.rs b/tests/ui/generics/duplicate-generic-parameter-error-86756.rs
new file mode 100644
index 00000000000..acc281cb8c4
--- /dev/null
+++ b/tests/ui/generics/duplicate-generic-parameter-error-86756.rs
@@ -0,0 +1,14 @@
+// https://github.com/rust-lang/rust/issues/86756
+//@ edition: 2015
+trait Foo<T, T = T> {}
+//~^ ERROR the name `T` is already used for a generic parameter in this item's generic parameters
+
+fn eq<A, B>() {
+    eq::<dyn, Foo>
+    //~^ ERROR cannot find type `dyn` in this scope
+    //~| ERROR missing generics for trait `Foo`
+    //~| WARN trait objects without an explicit `dyn` are deprecated
+    //~| WARN this is accepted in the current edition
+}
+
+fn main() {}