From f8beb8f7f71d6067997cbbb3b9dd2da3769fb020 Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Mon, 30 Aug 2021 22:34:46 +0200
Subject: [PATCH] Add test for extra <> in dyn suggestion.

---
 .../ui/dyn-keyword/dyn-angle-brackets.fixed   | 23 +++++++++++++++++
 src/test/ui/dyn-keyword/dyn-angle-brackets.rs | 23 +++++++++++++++++
 .../ui/dyn-keyword/dyn-angle-brackets.stderr  | 25 +++++++++++++++++++
 3 files changed, 71 insertions(+)
 create mode 100644 src/test/ui/dyn-keyword/dyn-angle-brackets.fixed
 create mode 100644 src/test/ui/dyn-keyword/dyn-angle-brackets.rs
 create mode 100644 src/test/ui/dyn-keyword/dyn-angle-brackets.stderr

diff --git a/src/test/ui/dyn-keyword/dyn-angle-brackets.fixed b/src/test/ui/dyn-keyword/dyn-angle-brackets.fixed
new file mode 100644
index 0000000000000..25caa6a8030ff
--- /dev/null
+++ b/src/test/ui/dyn-keyword/dyn-angle-brackets.fixed
@@ -0,0 +1,23 @@
+// See https://github.com/rust-lang/rust/issues/88508
+// run-rustfix
+// edition:2018
+#![deny(bare_trait_objects)]
+#![allow(dead_code)]
+#![allow(unused_imports)]
+
+use std::fmt;
+
+#[derive(Debug)]
+pub struct Foo;
+
+impl fmt::Display for Foo {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        <dyn fmt::Debug>::fmt(self, f)
+        //~^ ERROR trait objects without an explicit `dyn` are deprecated
+        //~| WARNING this is accepted in the current edition
+        //~| ERROR trait objects without an explicit `dyn` are deprecated
+        //~| WARNING this is accepted in the current edition
+    }
+}
+
+fn main() {}
diff --git a/src/test/ui/dyn-keyword/dyn-angle-brackets.rs b/src/test/ui/dyn-keyword/dyn-angle-brackets.rs
new file mode 100644
index 0000000000000..cf72da2b61ec2
--- /dev/null
+++ b/src/test/ui/dyn-keyword/dyn-angle-brackets.rs
@@ -0,0 +1,23 @@
+// See https://github.com/rust-lang/rust/issues/88508
+// run-rustfix
+// edition:2018
+#![deny(bare_trait_objects)]
+#![allow(dead_code)]
+#![allow(unused_imports)]
+
+use std::fmt;
+
+#[derive(Debug)]
+pub struct Foo;
+
+impl fmt::Display for Foo {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        <fmt::Debug>::fmt(self, f)
+        //~^ ERROR trait objects without an explicit `dyn` are deprecated
+        //~| WARNING this is accepted in the current edition
+        //~| ERROR trait objects without an explicit `dyn` are deprecated
+        //~| WARNING this is accepted in the current edition
+    }
+}
+
+fn main() {}
diff --git a/src/test/ui/dyn-keyword/dyn-angle-brackets.stderr b/src/test/ui/dyn-keyword/dyn-angle-brackets.stderr
new file mode 100644
index 0000000000000..ef0f5b7f59db9
--- /dev/null
+++ b/src/test/ui/dyn-keyword/dyn-angle-brackets.stderr
@@ -0,0 +1,25 @@
+error: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/dyn-angle-brackets.rs:15:10
+   |
+LL |         <fmt::Debug>::fmt(self, f)
+   |          ^^^^^^^^^^ help: use `dyn`: `dyn fmt::Debug`
+   |
+note: the lint level is defined here
+  --> $DIR/dyn-angle-brackets.rs:4:9
+   |
+LL | #![deny(bare_trait_objects)]
+   |         ^^^^^^^^^^^^^^^^^^
+   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+
+error: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/dyn-angle-brackets.rs:15:10
+   |
+LL |         <fmt::Debug>::fmt(self, f)
+   |          ^^^^^^^^^^ help: use `dyn`: `dyn fmt::Debug`
+   |
+   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+
+error: aborting due to 2 previous errors
+