1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/ui/regions/regions-assoc-type-region-bound-in-trait-not-met.rs b/src/test/ui/regions/regions-assoc-type-region-bound-in-trait-not-met.rs
new file mode 100644
index 000000000..575dfafe1
--- /dev/null
+++ b/src/test/ui/regions/regions-assoc-type-region-bound-in-trait-not-met.rs
@@ -0,0 +1,24 @@
+// Test that the compiler checks that arbitrary region bounds declared
+// in the trait must be satisfied on the impl. Issue #20890.
+
+trait Foo<'a> {
+    type Value: 'a;
+    fn dummy(&'a self) {}
+}
+
+impl<'a> Foo<'a> for &'a i16 {
+    // OK.
+    type Value = &'a i32;
+}
+
+impl<'a> Foo<'static> for &'a i32 {
+    type Value = &'a i32;
+    //~^ ERROR the type `&'a i32` does not fulfill the required lifetime
+}
+
+impl<'a, 'b> Foo<'b> for &'a i64 {
+    type Value = &'a i32;
+    //~^ ERROR the type `&'a i32` does not fulfill the required lifetime
+}
+
+fn main() {}