Add async versions of arbitrary_self_types_pin_lifetime tests.

src/test/ui/self/arbitrary_self_types_pin_lifetime-async.rs

@@ -0,0 +1,37 @@
+// check-pass
+// edition:2018
+
+#![feature(async_await)]
+
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+struct Foo;
+
+impl Foo {
+    async fn pin_ref(self: Pin<&Self>) -> Pin<&Self> { self }
+
+    async fn pin_mut(self: Pin<&mut Self>) -> Pin<&mut Self> { self }
+
+    async fn pin_pin_pin_ref(self: Pin<Pin<Pin<&Self>>>) -> Pin<Pin<Pin<&Self>>> { self }
+
+    async fn pin_ref_impl_trait(self: Pin<&Self>) -> impl Clone + '_ { self }
+
+    fn b(self: Pin<&Foo>, f: &Foo) -> Pin<&Foo> { self }
+}
+
+type Alias<T> = Pin<T>;
+impl Foo {
+    async fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> Alias<&Self> { self }
+}
+
+// FIXME(Centril): extend with the rest of the non-`async fn` test
+// when we allow `async fn`s inside traits and trait implementations.
+
+fn main() {
+    let mut foo = Foo;
+    { Pin::new(&foo).pin_ref() };
+    { Pin::new(&mut foo).pin_mut() };
+    { Pin::new(Pin::new(Pin::new(&foo))).pin_pin_pin_ref() };
+    { Pin::new(&foo).pin_ref_impl_trait() };
+}

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

@@ -0,0 +1,14 @@
+error: lifetime may not live long enough
+  --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:10:48
+   |
+LL |     async fn f(self: Pin<&Self>) -> impl Clone { self }
+   |                          -                     ^^^^^^^^ returning this value requires that `'_` must outlive `'static`
+   |                          |
+   |                          lifetime `'_` defined here
+help: to allow this `impl Trait` to capture borrowed data with lifetime `'_`, add `'_` as a constraint
+   |
+LL |     async fn f(self: Pin<&Self>) -> impl Clone + '_ { self }
+   |                                     ^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+

src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.rs

@@ -0,0 +1,16 @@
+// edition:2018
+
+#![feature(async_await)]
+
+use std::pin::Pin;
+
+struct Foo;
+
+impl Foo {
+    async fn f(self: Pin<&Self>) -> impl Clone { self }
+    //~^ ERROR cannot infer an appropriate lifetime
+}
+
+fn main() {
+    { Pin::new(&Foo).f() };
+}

src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr

@@ -0,0 +1,20 @@
+error: cannot infer an appropriate lifetime
+  --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:10:16
+   |
+LL |     async fn f(self: Pin<&Self>) -> impl Clone { self }
+   |                ^^^^                 ---------- this return type evaluates to the `'static` lifetime...
+   |                |
+   |                ...but this borrow...
+   |
+note: ...can't outlive the lifetime '_ as defined on the method body at 10:26
+  --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:10:26
+   |
+LL |     async fn f(self: Pin<&Self>) -> impl Clone { self }
+   |                          ^
+help: you can add a constraint to the return type to make it last less than `'static` and match the lifetime '_ as defined on the method body at 10:26
+   |
+LL |     async fn f(self: Pin<&Self>) -> impl Clone + '_ { self }
+   |                                     ^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,27 @@
+error[E0106]: missing lifetime specifier
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:10:45
+   |
+LL |     async fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
+   |                                             ^
+   |
+   = note: return-position elided lifetimes require exactly one input-position elided lifetime, found multiple.
+
+error[E0106]: missing lifetime specifier
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:15:60
+   |
+LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
+   |                                                            ^
+   |
+   = note: return-position elided lifetimes require exactly one input-position elided lifetime, found multiple.
+
+error[E0106]: missing lifetime specifier
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:15:67
+   |
+LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
+   |                                                                   ^
+   |
+   = note: return-position elided lifetimes require exactly one input-position elided lifetime, found multiple.
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0106`.

src/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async.rs

@@ -0,0 +1,28 @@
+// edition:2018
+
+#![feature(async_await)]
+
+use std::pin::Pin;
+
+struct Foo;
+
+impl Foo {
+    async fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
+    //~^ ERROR missing lifetime specifier
+    //~| ERROR cannot infer an appropriate lifetime
+    // FIXME: should be E0623?
+
+    async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
+    //~^ ERROR missing lifetime specifier
+    //~| ERROR cannot infer an appropriate lifetime
+    //~| ERROR missing lifetime specifier
+    //~| ERROR cannot infer an appropriate lifetime
+    // FIXME: should be E0623?
+}
+
+type Alias<T> = Pin<T>;
+impl Foo {
+    async fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> &() { arg } //~ ERROR E0623
+}
+
+fn main() {}

src/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async.stderr

@@ -0,0 +1,88 @@
+error[E0106]: missing lifetime specifier
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:10:45
+   |
+LL |     async fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
+   |                                             ^
+   |
+   = note: return-position elided lifetimes require exactly one input-position elided lifetime, found multiple.
+
+error[E0106]: missing lifetime specifier
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:15:60
+   |
+LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
+   |                                                            ^
+   |
+   = note: return-position elided lifetimes require exactly one input-position elided lifetime, found multiple.
+
+error[E0106]: missing lifetime specifier
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:15:67
+   |
+LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
+   |                                                                   ^
+   |
+   = note: return-position elided lifetimes require exactly one input-position elided lifetime, found multiple.
+
+error: cannot infer an appropriate lifetime
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:10:33
+   |
+LL |     async fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
+   |                                 ^           ---- this return type evaluates to the `'static` lifetime...
+   |                                 |
+   |                                 ...but this borrow...
+   |
+note: ...can't outlive the lifetime '_ as defined on the method body at 10:26
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:10:26
+   |
+LL |     async fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
+   |                          ^
+help: you can add a constraint to the return type to make it last less than `'static` and match the lifetime '_ as defined on the method body at 10:26
+   |
+LL |     async fn a(self: Pin<&Foo>, f: &Foo) -> &Foo + '_ { f }
+   |                                             ^^^^^^^^^
+
+error: cannot infer an appropriate lifetime
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:15:16
+   |
+LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
+   |                ^^^^ ...but this borrow...             ----------------- this return type evaluates to the `'static` lifetime...
+   |
+note: ...can't outlive the lifetime '_ as defined on the method body at 15:26
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:15:26
+   |
+LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
+   |                          ^
+help: you can add a constraint to the return type to make it last less than `'static` and match the lifetime '_ as defined on the method body at 15:26
+   |
+LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) + '_ { (self, f) }
+   |                                                       ^^^^^^^^^^^^^^^^^^^^^^
+
+error: cannot infer an appropriate lifetime
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:15:34
+   |
+LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
+   |                                  ^                    ----------------- this return type evaluates to the `'static` lifetime...
+   |                                  |
+   |                                  ...but this borrow...
+   |
+note: ...can't outlive the lifetime '_ as defined on the method body at 15:26
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:15:26
+   |
+LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
+   |                          ^
+help: you can add a constraint to the return type to make it last less than `'static` and match the lifetime '_ as defined on the method body at 15:26
+   |
+LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) + '_ { (self, f) }
+   |                                                       ^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0623]: lifetime mismatch
+  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:25:58
+   |
+LL |     async fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> &() { arg }
+   |                                  -----                   ^^^
+   |                                  |                       |
+   |                                  |                       ...but data from `arg` is returned here
+   |                                  this parameter and the return type are declared with different lifetimes...
+
+error: aborting due to 7 previous errors
+
+For more information about this error, try `rustc --explain E0106`.