1 files changed, 26 insertions, 0 deletions
diff --git a/tests/ui/regions/regions-infer-covariance-due-to-decl.rs b/tests/ui/regions/regions-infer-covariance-due-to-decl.rs
new file mode 100644
index 000000000..03c0e436e
--- /dev/null
+++ b/tests/ui/regions/regions-infer-covariance-due-to-decl.rs
@@ -0,0 +1,26 @@
+// 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.
+
+use std::marker;
+
+struct Covariant<'a> {
+    marker: marker::PhantomData<fn(&'a ())>
+}
+
+fn use_<'short,'long>(c: Covariant<'long>,
+                      s: &'short isize,
+                      l: &'long isize,
+                      _where:Option<&'short &'long ()>) {
+
+    // Test whether Covariant<'long> <: Covariant<'short>.  Since
+    // 'short <= 'long, this would be true if the Covariant type were
+    // contravariant with respect to its parameter 'a.
+
+    let _: Covariant<'short> = c;
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn main() {}