1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/bounds-are-checked.rs b/src/test/ui/type-alias-impl-trait/bounds-are-checked.rs
new file mode 100644
index 000000000..83d22161e
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/bounds-are-checked.rs
@@ -0,0 +1,24 @@
+// Make sure that we check that impl trait types implement the traits that they
+// claim to.
+
+#![feature(type_alias_impl_trait)]
+
+type X<'a> = impl Into<&'static str> + From<&'a str>;
+
+fn f<'a: 'static>(t: &'a str) -> X<'a> {
+    //~^ WARNING unnecessary lifetime parameter
+    t
+    //~^ ERROR non-defining opaque type use
+}
+
+fn extend_lt<'a>(o: &'a str) -> &'static str {
+    X::<'_>::from(o).into()
+}
+
+fn main() {
+    let r = {
+        let s = "abcdef".to_string();
+        extend_lt(&s)
+    };
+    println!("{}", r);
+}