1 files changed, 23 insertions, 0 deletions

diff --git a/src/test/ui/issues/auxiliary/issue-30123-aux.rs b/src/test/ui/issues/auxiliary/issue-30123-aux.rs
new file mode 100644
index 000000000..07c743eb2
--- /dev/null
+++ b/src/test/ui/issues/auxiliary/issue-30123-aux.rs
@@ -0,0 +1,23 @@
+use std::marker::PhantomData;
+
+pub struct Directed;
+pub struct Undirected;
+
+pub struct Graph<N, E, Ty = Directed> {
+    nodes: Vec<PhantomData<N>>,
+    edges: Vec<PhantomData<E>>,
+    ty: PhantomData<Ty>,
+}
+
+
+impl<N, E> Graph<N, E, Directed> {
+    pub fn new() -> Self {
+        Graph{nodes: Vec::new(), edges: Vec::new(), ty: PhantomData}
+    }
+}
+
+impl<N, E> Graph<N, E, Undirected> {
+    pub fn new_undirected() -> Self {
+        Graph{nodes: Vec::new(), edges: Vec::new(), ty: PhantomData}
+    }
+}