1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/higher-rank-trait-bounds/hrtb-trait-object-passed-to-closure.rs b/src/test/ui/higher-rank-trait-bounds/hrtb-trait-object-passed-to-closure.rs
new file mode 100644
index 000000000..41ebb3f5a
--- /dev/null
+++ b/src/test/ui/higher-rank-trait-bounds/hrtb-trait-object-passed-to-closure.rs
@@ -0,0 +1,25 @@
+// run-pass
+#![allow(dead_code)]
+// Test that `&PrinterSupport`, which is really short for `&'a
+// PrinterSupport<'b>`, gets properly expanded when it appears in a
+// closure type. This used to result in messed up De Bruijn indices.
+
+// pretty-expanded FIXME #23616
+
+trait PrinterSupport<'ast> {
+    fn ast_map(&self) -> Option<&'ast usize> { None }
+}
+
+struct NoAnn<'ast> {
+    f: Option<&'ast usize>
+}
+
+impl<'ast> PrinterSupport<'ast> for NoAnn<'ast> {
+}
+
+fn foo<'ast, G>(f: Option<&'ast usize>, g: G) where G: FnOnce(&dyn PrinterSupport) {
+    let annotation = NoAnn { f: f };
+    g(&annotation)
+}
+
+fn main() {}