arbitrary_self_types lifetime elision: --bless --compare-mode=nll.

src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.nll.stderr

@@ -0,0 +1,14 @@
+error: lifetime may not live long enough
+  --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait.rs:8:31
+   |
+LL |     fn f(self: Pin<&Self>) -> impl Clone { self }
+   |                    -          ^^^^^^^^^^ opaque type requires that `'1` must outlive `'static`
+   |                    |
+   |                    let's call the lifetime of this reference `'1`
+help: to allow this impl Trait to capture borrowed data with lifetime `'1`, add `'_` as a constraint
+   |
+LL |     fn f(self: Pin<&Self>) -> impl Clone + '_ { self }
+   |                               ^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+

src/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch.nll.stderr

@@ -0,0 +1,28 @@
+error: lifetime may not live long enough
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch.rs:8:46
+   |
+LL |     fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
+   |                    -         -               ^ function was supposed to return data with lifetime `'2` but it is returning data with lifetime `'1`
+   |                    |         |
+   |                    |         let's call the lifetime of this reference `'1`
+   |                    let's call the lifetime of this reference `'2`
+
+error: lifetime may not live long enough
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch.rs:10:69
+   |
+LL |     fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
+   |                    -          -                                     ^^^^^^^^^ function was supposed to return data with lifetime `'2` but it is returning data with lifetime `'1`
+   |                    |          |
+   |                    |          let's call the lifetime of this reference `'1`
+   |                    let's call the lifetime of this reference `'2`
+
+error: lifetime may not live long enough
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch.rs:15:58
+   |
+LL |     fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> &() { arg }
+   |            --  ---- has type `std::pin::Pin<&'1 Foo>`    ^^^ function was supposed to return data with lifetime `'1` but it is returning data with lifetime `'a`
+   |            |
+   |            lifetime `'a` defined here
+
+error: aborting due to 3 previous errors
+