regression test for issue 90847

Author: cameron1024

src/test/ui/const-generics/generic_const_exprs/issue-90847.rs

@@ -0,0 +1,9 @@
+// check-pass
+
+#![allow(incomplete_features)]
+#![feature(generic_const_exprs)]
+#![feature(adt_const_params)]
+
+struct Foo<const A: [(); 0 + 0]> where [(); 0 + 0]: Sized;
+
+fn main() {}