1 files changed, 13 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/unsize-although-ambiguous.rs b/tests/ui/traits/next-solver/unsize-although-ambiguous.rs
new file mode 100644
index 000000000..8217701b9
--- /dev/null
+++ b/tests/ui/traits/next-solver/unsize-although-ambiguous.rs
@@ -0,0 +1,13 @@
+// check-pass
+// compile-flags: -Znext-solver
+
+use std::fmt::Display;
+
+fn box_dyn_display(_: Box<dyn Display>) {}
+
+fn main() {
+    // During coercion, we don't necessarily know whether `{integer}` implements
+    // `Display`. Before, that would cause us to bail out in the coercion loop when
+    // checking `{integer}: Unsize<dyn Display>`.
+    box_dyn_display(Box::new(1));
+}