1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/specialization/defaultimpl/overlap-projection.rs b/src/test/ui/specialization/defaultimpl/overlap-projection.rs
new file mode 100644
index 000000000..0add4d551
--- /dev/null
+++ b/src/test/ui/specialization/defaultimpl/overlap-projection.rs
@@ -0,0 +1,25 @@
+// run-pass
+
+// Test that impls on projected self types can resolve overlap, even when the
+// projections involve specialization, so long as the associated type is
+// provided by the most specialized impl.
+
+#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
+
+trait Assoc {
+    type Output;
+}
+
+default impl<T> Assoc for T {
+    type Output = bool;
+}
+
+impl Assoc for u8 { type Output = u8; }
+impl Assoc for u16 { type Output = u16; }
+
+trait Foo {}
+impl Foo for u32 {}
+impl Foo for <u8 as Assoc>::Output {}
+impl Foo for <u16 as Assoc>::Output {}
+
+fn main() {}