1 files changed, 54 insertions, 0 deletions
diff --git a/tests/ui/traits/suggest-deferences/multiple-1.rs b/tests/ui/traits/suggest-deferences/multiple-1.rs
new file mode 100644
index 000000000..91c6c7924
--- /dev/null
+++ b/tests/ui/traits/suggest-deferences/multiple-1.rs
@@ -0,0 +1,54 @@
+use std::ops::{Deref, DerefMut};
+
+trait Happy {}
+struct LDM;
+impl Happy for &mut LDM {}
+
+struct Foo(LDM);
+struct Bar(Foo);
+struct Baz(Bar);
+impl Deref for Foo {
+    type Target = LDM;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl Deref for Bar {
+    type Target = Foo;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl Deref for Baz {
+    type Target = Bar;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl DerefMut for Foo {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+impl DerefMut for Bar {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+impl DerefMut for Baz {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+
+fn foo<T>(_: T) where T: Happy {}
+
+fn main() {
+    // Currently the compiler doesn't try to suggest dereferences for situations
+    // where DerefMut involves. So this test is meant to ensure compiler doesn't
+    // generate incorrect help message.
+    let mut baz = Baz(Bar(Foo(LDM)));
+    foo(&mut baz);
+    //~^ ERROR the trait bound `&mut Baz: Happy` is not satisfied
+}