1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/unsized/box-instead-of-dyn-fn.rs b/src/test/ui/unsized/box-instead-of-dyn-fn.rs
new file mode 100644
index 000000000..2fa741bc1
--- /dev/null
+++ b/src/test/ui/unsized/box-instead-of-dyn-fn.rs
@@ -0,0 +1,15 @@
+use std::fmt::Debug;
+
+// Test to suggest boxing the return type, and the closure branch of the `if`
+
+fn print_on_or_the_other<'a>(a: i32, b: &'a String) -> dyn Fn() + 'a {
+    //~^ ERROR return type cannot have an unboxed trait object
+    if a % 2 == 0 {
+        move || println!("{a}")
+    } else {
+        Box::new(move || println!("{}", b))
+        //~^ ERROR `if` and `else` have incompatible types
+    }
+}
+
+fn main() {}