1 files changed, 15 insertions, 0 deletions
diff --git a/tests/ui/underscore-lifetime/where-clause-trait-impl-underscore.rs b/tests/ui/underscore-lifetime/where-clause-trait-impl-underscore.rs
new file mode 100644
index 00000000000..371d2e4ba43
--- /dev/null
+++ b/tests/ui/underscore-lifetime/where-clause-trait-impl-underscore.rs
@@ -0,0 +1,15 @@
+// revisions: rust2015 rust2018
+//[rust2018] edition:2018
+
+trait WithType<T> {}
+trait WithRegion<'a> { }
+
+trait Foo { }
+
+impl<T> Foo for Vec<T>
+where
+    T: WithRegion<'_>
+//[rust2015,rust2018]~^ ERROR `'_` cannot be used here
+{ }
+
+fn main() {}