1 files changed, 48 insertions, 0 deletions
diff --git a/tests/ui/object-lifetime/object-lifetime-default-ambiguous.rs b/tests/ui/object-lifetime/object-lifetime-default-ambiguous.rs
new file mode 100644
index 000000000..5dae92fee
--- /dev/null
+++ b/tests/ui/object-lifetime/object-lifetime-default-ambiguous.rs
@@ -0,0 +1,48 @@
+// Test that if a struct declares multiple region bounds for a given
+// type parameter, an explicit lifetime bound is required on object
+// lifetimes within.
+
+#![allow(dead_code)]
+
+trait Test {
+    fn foo(&self) { }
+}
+
+struct Ref0<T:?Sized> {
+    r: *mut T
+}
+
+struct Ref1<'a,T:'a+?Sized> {
+    r: &'a T
+}
+
+struct Ref2<'a,'b:'a,T:'a+'b+?Sized> {
+    r: &'a &'b T
+}
+
+fn a<'a,'b>(t: Ref2<'a,'b, dyn Test>) {
+    //~^ ERROR lifetime bound for this object type cannot be deduced from context
+}
+
+fn b(t: Ref2<dyn Test>) {
+    //~^ ERROR lifetime bound for this object type cannot be deduced from context
+}
+
+fn c(t: Ref2<&dyn Test>) {
+    // In this case, the &'a overrides.
+}
+
+fn d(t: Ref2<Ref1<dyn Test>>) {
+    // In this case, the lifetime parameter from the Ref1 overrides.
+}
+
+fn e(t: Ref2<Ref0<dyn Test>>) {
+    // In this case, Ref2 is ambiguous, but Ref0 overrides with 'static.
+}
+
+fn f(t: &Ref2<dyn Test>) {
+    //~^ ERROR lifetime bound for this object type cannot be deduced from context
+}
+
+fn main() {
+}