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-rw-r--r--tests/ui/object-lifetime/object-lifetime-default-from-ref-struct.rs58
1 files changed, 58 insertions, 0 deletions
diff --git a/tests/ui/object-lifetime/object-lifetime-default-from-ref-struct.rs b/tests/ui/object-lifetime/object-lifetime-default-from-ref-struct.rs
new file mode 100644
index 000000000..e1a865fa5
--- /dev/null
+++ b/tests/ui/object-lifetime/object-lifetime-default-from-ref-struct.rs
@@ -0,0 +1,58 @@
+// run-pass
+// Test that the lifetime of the enclosing `&` is used for the object
+// lifetime bound.
+
+// pretty-expanded FIXME #23616
+
+#![allow(dead_code)]
+
+use std::fmt::Display;
+
+trait Test {
+ fn foo(&self) { }
+}
+
+struct Ref<'a,T:'a+?Sized> {
+ r: &'a T
+}
+
+struct Ref2<'a,'b,T:'a+'b+?Sized> {
+ a: &'a T,
+ b: &'b T
+}
+
+struct SomeStruct<'a> {
+ t: Ref<'a, dyn Test>,
+ u: Ref<'a, dyn Test+'a>,
+}
+
+fn a<'a>(t: Ref<'a, dyn Test>, mut ss: SomeStruct<'a>) {
+ ss.t = t;
+}
+
+fn b<'a>(t: Ref<'a, dyn Test>, mut ss: SomeStruct<'a>) {
+ ss.u = t;
+}
+
+fn c<'a>(t: Ref<'a, dyn Test+'a>, mut ss: SomeStruct<'a>) {
+ ss.t = t;
+}
+
+fn d<'a>(t: Ref<'a, dyn Test+'a>, mut ss: SomeStruct<'a>) {
+ ss.u = t;
+}
+
+fn e<'a>(_: Ref<'a, dyn Display+'static>) {}
+fn g<'a, 'b>(_: Ref2<'a, 'b, dyn Display+'static>) {}
+
+
+fn main() {
+ // Inside a function body, we can just infer all
+ // lifetimes, to allow Ref<'tmp, Display+'static>
+ // and Ref2<'tmp, 'tmp, Display+'static>.
+ let x = &0 as &(dyn Display+'static);
+ let r: Ref<dyn Display> = Ref { r: x };
+ let r2: Ref2<dyn Display> = Ref2 { a: x, b: x };
+ e(r);
+ g(r2);
+}