Auto merge of #51045 - Mark-Simulacrum:stable-point, r=alexcrichton 1.26.1

Stable point release (1.26.1)

This includes all items on [the wishlist](https://github.com/rust-lang/rust/issues/50756), plus https://github.com/rust-lang/rust/pull/50694, which backported cleanly.

The target date is May 29th, Tuesday next week.

cc @rust-lang/compiler @oli-obk @eddyb  -- I backported https://github.com/rust-lang/rust/pull/50812, but it wasn't a clean patch so review would be appreciated.

4 files changed, 60 insertions, 0 deletions

diff --git a/src/test/ui/impl-trait/universal-turbofish-in-method-issue-50950.rs b/src/test/ui/impl-trait/universal-turbofish-in-method-issue-50950.rs
new file mode 100644
index 00000000000..ac53612d2da
--- /dev/null
+++ b/src/test/ui/impl-trait/universal-turbofish-in-method-issue-50950.rs
@@ -0,0 +1,27 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::any::Any;
+pub struct EventHandler {
+}
+
+impl EventHandler
+{
+    pub fn handle_event<T: Any>(&mut self, _efunc: impl FnMut(T)) {}
+}
+
+struct TestEvent(i32);
+
+fn main() {
+    let mut evt = EventHandler {};
+    evt.handle_event::<TestEvent, fn(TestEvent)>(|_evt| {
+        //~^ ERROR cannot provide explicit type parameters
+    });
+}
diff --git a/src/test/ui/impl-trait/universal-turbofish-in-method-issue-50950.stderr b/src/test/ui/impl-trait/universal-turbofish-in-method-issue-50950.stderr
new file mode 100644
index 00000000000..fec3f78535d
--- /dev/null
+++ b/src/test/ui/impl-trait/universal-turbofish-in-method-issue-50950.stderr
@@ -0,0 +1,9 @@
+error[E0632]: cannot provide explicit type parameters when `impl Trait` is used in argument position.
+  --> $DIR/universal-turbofish-in-method-issue-50950.rs:24:9
+   |
+LL |     evt.handle_event::<TestEvent, fn(TestEvent)>(|_evt| {
+   |         ^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0632`.
diff --git a/src/test/ui/rfc-1937-termination-trait/termination-trait-impl-trait.rs b/src/test/ui/rfc-1937-termination-trait/termination-trait-impl-trait.rs
new file mode 100644
index 00000000000..92d21864c74
--- /dev/null
+++ b/src/test/ui/rfc-1937-termination-trait/termination-trait-impl-trait.rs
@@ -0,0 +1,13 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Tests that an `impl Trait` that is not `impl Termination` will not work.
+fn main() -> impl Copy { }
+//~^ ERROR `main` has invalid return type `impl std::marker::Copy`
diff --git a/src/test/ui/rfc-1937-termination-trait/termination-trait-impl-trait.stderr b/src/test/ui/rfc-1937-termination-trait/termination-trait-impl-trait.stderr
new file mode 100644
index 00000000000..7485f3066bb
--- /dev/null
+++ b/src/test/ui/rfc-1937-termination-trait/termination-trait-impl-trait.stderr
@@ -0,0 +1,11 @@
+error[E0277]: `main` has invalid return type `impl std::marker::Copy`
+  --> $DIR/termination-trait-impl-trait.rs:12:14
+   |
+LL | fn main() -> impl Copy { }
+   |              ^^^^^^^^^ `main` can only return types that implement `std::process::Termination`
+   |
+   = help: consider using `()`, or a `Result`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.