1 files changed, 29 insertions, 0 deletions
diff --git a/tests/ui/regions/regions-variance-contravariant-use-covariant-in-second-position.rs b/tests/ui/regions/regions-variance-contravariant-use-covariant-in-second-position.rs
new file mode 100644
index 000000000..f23ca537f
--- /dev/null
+++ b/tests/ui/regions/regions-variance-contravariant-use-covariant-in-second-position.rs
@@ -0,0 +1,29 @@
+// Test that a type which is covariant with respect to its region
+// parameter yields an error when used in a contravariant way.
+//
+// Note: see variance-regions-*.rs for the tests that check that the
+// variance inference works in the first place.
+
+// `S` is contravariant with respect to both parameters.
+struct S<'a, 'b> {
+    f: &'a isize,
+    g: &'b isize,
+}
+
+fn use_<'short,'long>(c: S<'long, 'short>,
+                      s: &'short isize,
+                      l: &'long isize,
+                      _where:Option<&'short &'long ()>) {
+
+    let _: S<'long, 'short> = c; // OK
+    let _: S<'short, 'short> = c; // OK
+
+    // Test whether S<_,'short> <: S<_,'long>.  Since
+    // 'short <= 'long, this would be true if the Contravariant type were
+    // covariant with respect to its parameter 'a.
+
+    let _: S<'long, 'long> = c;
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn main() {}