Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

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

1 files changed, 50 insertions, 0 deletions

diff --git a/src/test/ui/hrtb/hrtb-higher-ranker-supertraits-transitive.rs b/src/test/ui/hrtb/hrtb-higher-ranker-supertraits-transitive.rs
new file mode 100644
index 000000000..f9ae1429e
--- /dev/null
+++ b/src/test/ui/hrtb/hrtb-higher-ranker-supertraits-transitive.rs
@@ -0,0 +1,50 @@
+// Test HRTB supertraits with several levels of expansion required.
+
+trait Foo<'tcx>
+{
+    fn foo(&'tcx self) -> &'tcx isize;
+}
+
+trait Bar<'ccx>
+    : for<'tcx> Foo<'tcx>
+{
+    fn bar(&'ccx self) -> &'ccx isize;
+}
+
+trait Baz
+    : for<'ccx> Bar<'ccx>
+{
+    fn dummy(&self);
+}
+
+trait Qux
+    : Bar<'static>
+{
+    fn dummy(&self);
+}
+
+fn want_foo_for_any_tcx<F>(f: &F)
+    where F : for<'tcx> Foo<'tcx>
+{
+}
+
+fn want_bar_for_any_ccx<B>(b: &B)
+    where B : for<'ccx> Bar<'ccx>
+{
+}
+
+fn want_baz<B>(b: &B)
+    where B : Baz
+{
+    want_foo_for_any_tcx(b);
+    want_bar_for_any_ccx(b);
+}
+
+fn want_qux<B>(b: &B)
+    where B : Qux
+{
+    want_foo_for_any_tcx(b);
+    want_bar_for_any_ccx(b); //~ ERROR
+}
+
+fn main() {}