Merging upstream version 1.68.2+dfsg1.

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

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/ui/higher-rank-trait-bounds/hrtb-opt-in-copy.rs b/tests/ui/higher-rank-trait-bounds/hrtb-opt-in-copy.rs
new file mode 100644
index 000000000..04519f116
--- /dev/null
+++ b/tests/ui/higher-rank-trait-bounds/hrtb-opt-in-copy.rs
@@ -0,0 +1,28 @@
+// run-pass
+// Test that we handle binder levels correctly when checking whether a
+// type can implement `Copy`. In particular, we had a bug where we failed to
+// liberate the late-bound regions from the impl, and thus wound up
+// searching for an impl of `for<'tcx> Foo<&'tcx T>`. The impl that
+// exists however is `impl<T> Copy for Foo<T>` and the current rules
+// did not consider that a match (something I would like to revise in
+// a later PR).
+
+#![allow(dead_code)]
+
+use std::marker::PhantomData;
+
+#[derive(Copy, Clone)]
+struct Foo<T> { x: T }
+
+type Ty<'tcx> = &'tcx TyS<'tcx>;
+
+enum TyS<'tcx> {
+    Boop(PhantomData<*mut &'tcx ()>)
+}
+
+#[derive(Copy, Clone)]
+enum Bar<'tcx> {
+    Baz(Foo<Ty<'tcx>>)
+}
+
+fn main() { }