Don't consider regions in deref_into_dyn_supertrait lint

tests/ui/traits/trait-upcasting/inference-behavior-change-deref.rs

@@ -0,0 +1,36 @@
+#![deny(deref_into_dyn_supertrait)]
+#![feature(trait_upcasting)] // remove this and the test compiles
+
+use std::ops::Deref;
+
+trait Bar<T> {}
+impl<T, U> Bar<U> for T {}
+
+trait Foo: Bar<i32> {
+    fn as_dyn_bar_u32<'a>(&self) -> &(dyn Bar<u32> + 'a);
+}
+
+impl Foo for () {
+    fn as_dyn_bar_u32<'a>(&self) -> &(dyn Bar<u32> + 'a) {
+        self
+    }
+}
+
+impl<'a> Deref for dyn Foo + 'a {
+    type Target = dyn Bar<u32> + 'a;
+
+    fn deref(&self) -> &Self::Target {
+        self.as_dyn_bar_u32()
+    }
+}
+
+fn take_dyn<T>(x: &dyn Bar<T>) -> T {
+    todo!()
+}
+
+fn main() {
+    let x: &dyn Foo = &();
+    let y = take_dyn(x);
+    let z: u32 = y;
+    //~^ ERROR mismatched types
+}

tests/ui/traits/trait-upcasting/inference-behavior-change-deref.stderr

@@ -0,0 +1,16 @@
+error[E0308]: mismatched types
+  --> $DIR/inference-behavior-change-deref.rs:34:18
+   |
+LL |     let z: u32 = y;
+   |            ---   ^ expected `u32`, found `i32`
+   |            |
+   |            expected due to this
+   |
+help: you can convert an `i32` to a `u32` and panic if the converted value doesn't fit
+   |
+LL |     let z: u32 = y.try_into().unwrap();
+   |                   ++++++++++++++++++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.

tests/ui/traits/trait-upcasting/migrate-lint-deny-regions.rs

@@ -0,0 +1,18 @@
+#![deny(deref_into_dyn_supertrait)]
+
+use std::ops::Deref;
+
+trait Bar<'a> {}
+trait Foo<'a>: Bar<'a> {}
+
+impl<'a> Deref for dyn Foo<'a> {
+    //~^ ERROR dyn Foo<'_>` implements `Deref` with supertrait `Bar<'_>` as target
+    //~| WARN this was previously accepted by the compiler
+    type Target = dyn Bar<'a>;
+
+    fn deref(&self) -> &Self::Target {
+        todo!()
+    }
+}
+
+fn main() {}

tests/ui/traits/trait-upcasting/migrate-lint-deny-regions.stderr

@@ -0,0 +1,19 @@
+error: `dyn Foo<'_>` implements `Deref` with supertrait `Bar<'_>` as target
+  --> $DIR/migrate-lint-deny-regions.rs:8:1
+   |
+LL | impl<'a> Deref for dyn Foo<'a> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+...
+LL |     type Target = dyn Bar<'a>;
+   |     -------------------------- target type is set here
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #89460 <https://github.com/rust-lang/rust/issues/89460>
+note: the lint level is defined here
+  --> $DIR/migrate-lint-deny-regions.rs:1:9
+   |
+LL | #![deny(deref_into_dyn_supertrait)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+

tests/ui/traits/trait-upcasting/migrate-lint-deny.rs

@@ -1,15 +1,13 @@
 #![deny(deref_into_dyn_supertrait)]
 
-extern crate core;
-
-use core::ops::Deref;
+use std::ops::Deref;
 
 // issue 89190
 trait A {}
 trait B: A {}
 
 impl<'a> Deref for dyn 'a + B {
-    //~^ ERROR `(dyn B + 'a)` implements `Deref` with supertrait `A` as target
+    //~^ ERROR `dyn B` implements `Deref` with supertrait `A` as target
     //~| WARN this was previously accepted by the compiler but is being phased out;
 
     type Target = dyn A;

tests/ui/traits/trait-upcasting/migrate-lint-deny.stderr

@@ -1,5 +1,5 @@
-error: `(dyn B + 'a)` implements `Deref` with supertrait `A` as target
-  --> $DIR/migrate-lint-deny.rs:11:1
+error: `dyn B` implements `Deref` with supertrait `A` as target
+  --> $DIR/migrate-lint-deny.rs:9:1
    |
 LL | impl<'a> Deref for dyn 'a + B {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^