1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/ui/specialization/issue-51892.rs b/src/test/ui/specialization/issue-51892.rs
new file mode 100644
index 000000000..5c0625414
--- /dev/null
+++ b/src/test/ui/specialization/issue-51892.rs
@@ -0,0 +1,18 @@
+#![allow(incomplete_features)]
+#![feature(generic_const_exprs)]
+#![feature(specialization)]
+
+pub trait Trait {
+    type Type;
+}
+
+impl<T: ?Sized> Trait for T {
+    default type Type = [u8; 1];
+}
+
+impl<T: Trait> Trait for *const T {
+    type Type = [u8; std::mem::size_of::<<T as Trait>::Type>()];
+    //~^ ERROR: unconstrained generic constant
+}
+
+fn main() {}