2 files changed, 47 insertions, 0 deletions
diff --git a/src/test/ui/error-codes/e0119/auxiliary/complex_impl_support.rs b/src/test/ui/error-codes/e0119/auxiliary/complex_impl_support.rs
new file mode 100644
index 000000000..ad5bb107f
--- /dev/null
+++ b/src/test/ui/error-codes/e0119/auxiliary/complex_impl_support.rs
@@ -0,0 +1,22 @@
+use std::marker::PhantomData;
+
+pub trait External {}
+
+pub struct M<'a, 'b, 'c, T, U, V> {
+    a: PhantomData<&'a ()>,
+    b: PhantomData<&'b ()>,
+    c: PhantomData<&'c ()>,
+    d: PhantomData<T>,
+    e: PhantomData<U>,
+    f: PhantomData<V>,
+}
+
+impl<'a, 'b, 'c, T, U, V, W> External for (T, M<'a, 'b, 'c, Box<U>, V, W>)
+where
+    'b: 'a,
+    T: 'a,
+    U: (FnOnce(T) -> V) + 'static,
+    V: Iterator<Item=T> + Clone,
+    W: std::ops::Add,
+    W::Output: Copy,
+{}
diff --git a/src/test/ui/error-codes/e0119/auxiliary/issue-23563-a.rs b/src/test/ui/error-codes/e0119/auxiliary/issue-23563-a.rs
new file mode 100644
index 000000000..141f36369
--- /dev/null
+++ b/src/test/ui/error-codes/e0119/auxiliary/issue-23563-a.rs
@@ -0,0 +1,25 @@
+// Ref: https://github.com/rust-lang/rust/issues/23563#issuecomment-260751672
+
+pub trait LolTo<T> {
+    fn convert_to(&self) -> T;
+}
+
+pub trait LolInto<T>: Sized {
+    fn convert_into(self) -> T;
+}
+
+pub trait LolFrom<T> {
+    fn from(_: T) -> Self;
+}
+
+impl<'a, T: ?Sized, U> LolInto<U> for &'a T where T: LolTo<U> {
+    fn convert_into(self) -> U {
+        self.convert_to()
+    }
+}
+
+impl<T, U> LolFrom<T> for U where T: LolInto<U> {
+    fn from(t: T) -> U {
+        t.convert_into()
+    }
+}