Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/tests/ui/specialization/specialization-translate-projections.rs b/tests/ui/specialization/specialization-translate-projections.rs
new file mode 100644
index 000000000..92ea9e2b8
--- /dev/null
+++ b/tests/ui/specialization/specialization-translate-projections.rs
@@ -0,0 +1,33 @@
+// run-pass
+
+// Ensure that provided items are inherited properly even when impls vary in
+// type parameters *and* rely on projections.
+
+#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
+
+use std::convert::Into;
+
+trait Trait {
+    fn to_u8(&self) -> u8;
+}
+trait WithAssoc {
+    type Item;
+    fn to_item(&self) -> Self::Item;
+}
+
+impl<T, U> Trait for T where T: WithAssoc<Item=U>, U: Into<u8> {
+    fn to_u8(&self) -> u8 {
+        self.to_item().into()
+    }
+}
+
+impl WithAssoc for u8 {
+    type Item = u8;
+    fn to_item(&self) -> u8 { *self }
+}
+
+impl Trait for u8 {}
+
+fn main() {
+    assert!(3u8.to_u8() == 3u8);
+}