1 files changed, 9 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/method-suggestion-no-duplication.rs b/src/test/ui/impl-trait/method-suggestion-no-duplication.rs
new file mode 100644
index 000000000..c5c966a95
--- /dev/null
+++ b/src/test/ui/impl-trait/method-suggestion-no-duplication.rs
@@ -0,0 +1,9 @@
+// issue #21405
+struct Foo;
+
+fn foo<F>(f: F) where F: FnMut(Foo) {}
+
+fn main() {
+    foo(|s| s.is_empty());
+    //~^ ERROR no method named `is_empty` found
+}