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, 30 insertions, 0 deletions

diff --git a/src/test/ui/polymorphization/unsized_cast.rs b/src/test/ui/polymorphization/unsized_cast.rs
new file mode 100644
index 000000000..b803fec2c
--- /dev/null
+++ b/src/test/ui/polymorphization/unsized_cast.rs
@@ -0,0 +1,30 @@
+// build-fail
+// compile-flags:-Zpolymorphize=on
+#![feature(fn_traits, rustc_attrs, unboxed_closures)]
+
+// This test checks that the polymorphization analysis considers a closure
+// as using all generic parameters if it does an unsizing cast.
+
+#[rustc_polymorphize_error]
+fn foo<T: Default>() {
+    let _: T = Default::default();
+    (|| Box::new(|| {}) as Box<dyn Fn()>)();
+    //~^ ERROR item has unused generic parameters
+    //~^^ ERROR item has unused generic parameters
+}
+
+#[rustc_polymorphize_error]
+fn foo2<T: Default>() {
+    let _: T = Default::default();
+    (|| {
+        //~^ ERROR item has unused generic parameters
+        let call: extern "rust-call" fn(_, _) = Fn::call;
+        call(&|| {}, ());
+        //~^ ERROR item has unused generic parameters
+    })();
+}
+
+fn main() {
+    foo::<u32>();
+    foo2::<u32>();
+}