Check for dyn impls in method resolution

crates/hir_ty/src/tests/method_resolution.rs

@@ -1106,3 +1106,25 @@ fn main() {
 "#,
     );
 }
+
+#[test]
+fn method_on_dyn_impl() {
+    check_types(
+        r#"
+trait Foo {}
+
+impl Foo for u32 {}
+impl dyn Foo {
+    pub fn dyn_foo(&self) -> u32 {
+        0
+    }
+}
+
+fn main() {
+    let f = &42u32 as &dyn Foo<u32>;
+    f.dyn_foo();
+  // ^u32
+}
+"#,
+    );
+}