Auto merge of #109335 - Mark-Simulacrum:stable-next, r=Mark-Simulacrum 1.68.1

[stable] 1.68.1 release

This packages up a set of release notes, version bump, and backports of:

* Don't eagerly convert principal to string #108162
*  Revert "enable ThinLTO for rustc on x86_64-pc-windows-msvc dist builds" #109094
*  Create dirs for build_triple #109111
*  Fix linker detection for clang with prefix #109156
*  ci: use apt install --download-only for solaris debs #108951

The last of those is not yet stable-accepted but I expect it to be, we will drop it and rebuild artifacts if we don't actually approve it.

r? `@Mark-Simulacrum`

1 files changed, 6 insertions, 0 deletions

diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index 6a7b23e40a7..91a7d5d38a1 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -931,6 +931,12 @@ impl<'tcx> PolyExistentialTraitRef<'tcx> {
     }
 }
 
+impl rustc_errors::IntoDiagnosticArg for PolyExistentialTraitRef<'_> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+        self.to_string().into_diagnostic_arg()
+    }
+}
+
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, TyEncodable, TyDecodable)]
 #[derive(HashStable)]
 pub enum BoundVariableKind {