Check freeze with right param-env

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/ui/codegen/freeze-on-polymorphic-projection.rs b/tests/ui/codegen/freeze-on-polymorphic-projection.rs
new file mode 100644
index 00000000000..edc79f8fd94
--- /dev/null
+++ b/tests/ui/codegen/freeze-on-polymorphic-projection.rs
@@ -0,0 +1,19 @@
+// build-pass
+// compile-flags: -Copt-level=1 --crate-type=lib
+
+#![feature(specialization)]
+//~^ WARN the feature `specialization` is incomplete
+
+pub unsafe trait Storage {
+    type Handle;
+}
+
+pub unsafe trait MultipleStorage: Storage {}
+
+default unsafe impl<S> Storage for S where S: MultipleStorage {}
+
+// Make sure that we call is_freeze on `(S::Handle,)` in the param-env of `ice`,
+// instead of in an empty, reveal-all param-env.
+pub fn ice<S: Storage>(boxed: (S::Handle,)) -> (S::Handle,) {
+    boxed
+}