1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/dep-graph/dep-graph-variance-alias.rs b/tests/ui/dep-graph/dep-graph-variance-alias.rs
new file mode 100644
index 000000000..008434696
--- /dev/null
+++ b/tests/ui/dep-graph/dep-graph-variance-alias.rs
@@ -0,0 +1,22 @@
+// Test that changing what a `type` points to does not go unnoticed
+// by the variance analysis.
+
+// incremental
+// compile-flags: -Z query-dep-graph
+
+#![feature(rustc_attrs)]
+#![allow(dead_code)]
+#![allow(unused_variables)]
+fn main() {}
+
+#[rustc_if_this_changed]
+struct Foo<T> {
+    f: T,
+}
+
+type TypeAlias<T> = Foo<T>;
+
+#[rustc_then_this_would_need(variances_of)] //~ ERROR OK
+struct Use<T> {
+    x: TypeAlias<T>,
+}