1 files changed, 20 insertions, 0 deletions
diff --git a/src/test/ui/const-generics/generic_const_exprs/abstract-const-as-cast-2.rs b/src/test/ui/const-generics/generic_const_exprs/abstract-const-as-cast-2.rs
new file mode 100644
index 000000000..3b5b87b2b
--- /dev/null
+++ b/src/test/ui/const-generics/generic_const_exprs/abstract-const-as-cast-2.rs
@@ -0,0 +1,20 @@
+#![feature(generic_const_exprs)]
+#![allow(incomplete_features)]
+
+struct Evaluatable<const N: u128> {}
+
+struct Foo<const N: u8>([u8; N as usize])
+//~^ Error: unconstrained generic constant
+//~| help: try adding a `where` bound using this expression: `where [(); N as usize]:`
+where
+    Evaluatable<{N as u128}>:;
+
+struct Foo2<const N: u8>(Evaluatable::<{N as u128}>) where Evaluatable<{N as usize as u128 }>:;
+//~^ Error: unconstrained generic constant
+//~| help: try adding a `where` bound using this expression: `where [(); {N as u128}]:`
+
+struct Bar<const N: u8>([u8; (N + 2) as usize]) where [(); (N + 1) as usize]:;
+//~^ Error: unconstrained generic constant
+//~| help: try adding a `where` bound using this expression: `where [(); (N + 2) as usize]:`
+
+fn main() {}