1 files changed, 34 insertions, 0 deletions
diff --git a/src/test/ui/variance/variance-regions-indirect.rs b/src/test/ui/variance/variance-regions-indirect.rs
new file mode 100644
index 000000000..f84f25ada
--- /dev/null
+++ b/src/test/ui/variance/variance-regions-indirect.rs
@@ -0,0 +1,34 @@
+// Test that we correctly infer variance for region parameters in
+// case that involve multiple intricate types.
+// Try enums too.
+
+#![feature(rustc_attrs)]
+
+#[rustc_variance]
+enum Base<'a, 'b, 'c:'b, 'd> { //~ ERROR [+, -, o, *]
+    Test8A(extern "Rust" fn(&'a isize)),
+    Test8B(&'b [isize]),
+    Test8C(&'b mut &'c str),
+}
+
+#[rustc_variance]
+struct Derived1<'w, 'x:'y, 'y, 'z> { //~ ERROR [*, o, -, +]
+    f: Base<'z, 'y, 'x, 'w>
+}
+
+#[rustc_variance] // Combine - and + to yield o
+struct Derived2<'a, 'b:'a, 'c> { //~ ERROR [o, o, *]
+    f: Base<'a, 'a, 'b, 'c>
+}
+
+#[rustc_variance] // Combine + and o to yield o (just pay attention to 'a here)
+struct Derived3<'a:'b, 'b, 'c> { //~ ERROR [o, -, *]
+    f: Base<'a, 'b, 'a, 'c>
+}
+
+#[rustc_variance] // Combine + and * to yield + (just pay attention to 'a here)
+struct Derived4<'a, 'b, 'c:'b> { //~ ERROR [+, -, o]
+    f: Base<'a, 'b, 'c, 'a>
+}
+
+fn main() {}