1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/const-generics/ensure_is_evaluatable.rs b/tests/ui/const-generics/ensure_is_evaluatable.rs
new file mode 100644
index 000000000..1e8d8c3d3
--- /dev/null
+++ b/tests/ui/const-generics/ensure_is_evaluatable.rs
@@ -0,0 +1,20 @@
+#![feature(generic_const_exprs)]
+#![allow(incomplete_features)]
+
+fn foo<const N: usize, const M: usize>() -> [(); N+2]
+where
+    [(); N + 1]:,
+    [(); M + 1]:,
+{
+    bar()
+    //~^ ERROR: unconstrained
+}
+
+fn bar<const N: usize>() -> [(); N]
+where
+    [(); N + 1]:,
+{
+    [(); N]
+}
+
+fn main() {}