1 files changed, 19 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-39559.rs b/src/test/ui/issues/issue-39559.rs
new file mode 100644
index 000000000..58d259407
--- /dev/null
+++ b/src/test/ui/issues/issue-39559.rs
@@ -0,0 +1,19 @@
+trait Dim {
+    fn dim() -> usize;
+}
+
+enum Dim3 {}
+
+impl Dim for Dim3 {
+    fn dim() -> usize {
+        3
+    }
+}
+
+pub struct Vector<T, D: Dim> {
+    entries: [T; D::dim()],
+    //~^ ERROR generic parameters may not be used
+    _dummy: D,
+}
+
+fn main() {}