diff --git a/tests/ui/ice-4121.rs b/tests/ui/ice-4121.rs
new file mode 100644
index 000000000000..e1a142fdcb67
--- /dev/null
+++ b/tests/ui/ice-4121.rs
@@ -0,0 +1,13 @@
+use std::mem;
+
+pub struct Foo<A, B>(A, B);
+
+impl<A, B> Foo<A, B> {
+    const HOST_SIZE: usize = mem::size_of::<B>();
+
+    pub fn crash() -> bool {
+        Self::HOST_SIZE == 0
+    }
+}
+
+fn main() {}