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, 9 insertions, 0 deletions

diff --git a/src/test/ui/unboxed-closures/unboxed-closure-no-cyclic-sig.rs b/src/test/ui/unboxed-closures/unboxed-closure-no-cyclic-sig.rs
new file mode 100644
index 000000000..9d0aa4132
--- /dev/null
+++ b/src/test/ui/unboxed-closures/unboxed-closure-no-cyclic-sig.rs
@@ -0,0 +1,9 @@
+// Test that unboxed closures cannot capture their own type.
+//
+// Also regression test for issue #21410.
+
+fn g<F>(_: F) where F: FnOnce(Option<F>) {}
+
+fn main() {
+    g(|_| {  }); //~ ERROR closure/generator type that references itself
+}