1 files changed, 11 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/defaults-wf.rs b/src/test/ui/associated-types/defaults-wf.rs
new file mode 100644
index 000000000..99b512503
--- /dev/null
+++ b/src/test/ui/associated-types/defaults-wf.rs
@@ -0,0 +1,11 @@
+// Check that associated type defaults are wf checked.
+
+#![feature(associated_type_defaults)]
+
+// Default types must always be wf
+trait Tr3 {
+    type Ty = Vec<[u8]>;
+    //~^ ERROR the size for values of type `[u8]` cannot be known at compilation time
+}
+
+fn main() {}