Update test

Author: bjorn3

tests/ui/specialization/min_specialization/issue-79224.rs

@@ -1,6 +1,16 @@
 #![feature(min_specialization)]
 use std::fmt::{self, Display};
 
+pub trait ToString {
+    fn to_string(&self) -> String;
+}
+
+impl<T: Display + ?Sized> ToString for T {
+    default fn to_string(&self) -> String {
+        todo!()
+    }
+}
+
 pub enum Cow<'a, B: ?Sized + 'a, O = <B as ToOwned>::Owned>
 where
     B: ToOwned,

tests/ui/specialization/min_specialization/issue-79224.stderr

@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `B: Clone` is not satisfied
-  --> $DIR/issue-79224.rs:18:29
+  --> $DIR/issue-79224.rs:28:29
    |
 LL | impl<B: ?Sized> Display for Cow<'_, B> {
    |                             ^^^^^^^^^^ the trait `Clone` is not implemented for `B`
@@ -11,7 +11,7 @@ LL | impl<B: ?Sized + std::clone::Clone> Display for Cow<'_, B> {
    |                +++++++++++++++++++
 
 error[E0277]: the trait bound `B: Clone` is not satisfied
-  --> $DIR/issue-79224.rs:20:5
+  --> $DIR/issue-79224.rs:30:5
    |
 LL |     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `B`
@@ -23,7 +23,7 @@ LL | impl<B: ?Sized + std::clone::Clone> Display for Cow<'_, B> {
    |                +++++++++++++++++++
 
 error[E0277]: the trait bound `B: Clone` is not satisfied
-  --> $DIR/issue-79224.rs:20:13
+  --> $DIR/issue-79224.rs:30:13
    |
 LL |     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    |             ^^^^ the trait `Clone` is not implemented for `B`
@@ -35,7 +35,7 @@ LL | impl<B: ?Sized + std::clone::Clone> Display for Cow<'_, B> {
    |                +++++++++++++++++++
 
 error[E0277]: the trait bound `B: Clone` is not satisfied
-  --> $DIR/issue-79224.rs:20:62
+  --> $DIR/issue-79224.rs:30:62
    |
 LL |       fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    |  ______________________________________________________________^