1 files changed, 42 insertions, 0 deletions
diff --git a/src/test/ui/object-safety/object-safety-issue-22040.rs b/src/test/ui/object-safety/object-safety-issue-22040.rs
new file mode 100644
index 000000000..1fc5c5442
--- /dev/null
+++ b/src/test/ui/object-safety/object-safety-issue-22040.rs
@@ -0,0 +1,42 @@
+// Regression test for #22040.
+
+use std::fmt::Debug;
+
+trait Expr: Debug + PartialEq {
+    fn print_element_count(&self);
+}
+
+//#[derive(PartialEq)]
+#[derive(Debug)]
+struct SExpr<'x> {
+    elements: Vec<Box<dyn Expr + 'x>>,
+    //~^ ERROR E0038
+}
+
+impl<'x> PartialEq for SExpr<'x> {
+    fn eq(&self, other:&SExpr<'x>) -> bool {
+        println!("L1: {} L2: {}", self.elements.len(), other.elements.len());
+
+        let result = self.elements.len() == other.elements.len();
+
+        println!("Got compare {}", result);
+        return result;
+    }
+}
+
+impl <'x> SExpr<'x> {
+    fn new() -> SExpr<'x> { return SExpr{elements: Vec::new(),}; }
+}
+
+impl <'x> Expr for SExpr<'x> {
+    fn print_element_count(&self) {
+        println!("element count: {}", self.elements.len());
+    }
+}
+
+fn main() {
+    let a: Box<dyn Expr> = Box::new(SExpr::new());
+    let b: Box<dyn Expr> = Box::new(SExpr::new());
+
+    // assert_eq!(a , b);
+}