1 files changed, 29 insertions, 0 deletions

diff --git a/src/test/ui/impl-trait/issues/issue-57464-unexpected-regions.rs b/src/test/ui/impl-trait/issues/issue-57464-unexpected-regions.rs
new file mode 100644
index 000000000..c4f738a34
--- /dev/null
+++ b/src/test/ui/impl-trait/issues/issue-57464-unexpected-regions.rs
@@ -0,0 +1,29 @@
+// Regression test for issue 57464.
+//
+// Closure are (surprisingly) allowed to outlive their signature. As such it
+// was possible to end up with `ReScope`s appearing in the concrete type of an
+// opaque type. As all regions are now required to outlive the bound in an
+// opaque type we avoid the issue here.
+
+// check-pass
+
+struct A<F>(F);
+
+unsafe impl <'a, 'b, F: Fn(&'a i32) -> &'b i32> Send for A<F> {}
+
+fn wrapped_closure() -> impl Sized {
+    let f = |x| x;
+    f(&0);
+    A(f)
+}
+
+fn wrapped_closure_with_bound() -> impl Sized + 'static {
+    let f = |x| x;
+    f(&0);
+    A(f)
+}
+
+fn main() {
+    let x: Box<dyn Send> = Box::new(wrapped_closure());
+    let y: Box<dyn Send> = Box::new(wrapped_closure_with_bound());
+}