1 files changed, 36 insertions, 0 deletions
diff --git a/src/test/ui/impl-header-lifetime-elision/dyn-trait.rs b/src/test/ui/impl-header-lifetime-elision/dyn-trait.rs
new file mode 100644
index 000000000..359c08c98
--- /dev/null
+++ b/src/test/ui/impl-header-lifetime-elision/dyn-trait.rs
@@ -0,0 +1,36 @@
+// Test that `impl MyTrait<'_> for &i32` is equivalent to `impl<'a,
+// 'b> MyTrait<'a> for &'b i32`.
+
+#![allow(warnings)]
+
+use std::fmt::Debug;
+
+// Equivalent to `Box<dyn Debug + 'static>`:
+trait StaticTrait { }
+impl StaticTrait for Box<dyn Debug> { }
+
+// Equivalent to `Box<dyn Debug + 'static>`:
+trait NotStaticTrait { }
+impl NotStaticTrait for Box<dyn Debug + '_> { }
+
+// Check that we don't err when the trait has a lifetime parameter.
+trait TraitWithLifetime<'a> { }
+impl NotStaticTrait for &dyn TraitWithLifetime<'_> { }
+
+fn static_val<T: StaticTrait>(_: T) {
+}
+
+fn with_dyn_debug_static<'a>(x: Box<dyn Debug + 'a>) {
+    static_val(x);
+    //~^ ERROR borrowed data escapes outside of function
+}
+
+fn not_static_val<T: NotStaticTrait>(_: T) {
+}
+
+fn with_dyn_debug_not_static<'a>(x: Box<dyn Debug + 'a>) {
+    not_static_val(x); // OK
+}
+
+fn main() {
+}