Auto merge of #137688 - fmease:rollup-gbeuj9j, r=fmease

Rollup of 10 pull requests

Successful merges:

 - #134585 (remove `MaybeUninit::uninit_array`)
 - #136187 (Use less CString in the examples of CStr.)
 - #137201 (Teach structured errors to display short `Ty<'_>`)
 - #137620 (Fix `attr` cast for espidf)
 - #137631 (Avoid collecting associated types for undefined trait)
 - #137635 (Don't suggest constraining unstable associated types)
 - #137642 (Rustc dev guide subtree update)
 - #137660 (Update gcc submodule)
 - #137670 (revert accidental change in get_closest_merge_commit)
 - #137671 (Make -Z unpretty=mir suggest -Z dump-mir as well for discoverability)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_ast_passes/src/errors.rs

@@ -535,7 +535,6 @@ pub(crate) struct WhereClauseBeforeTypeAlias {
 }
 
 #[derive(Subdiagnostic)]
-
 pub(crate) enum WhereClauseBeforeTypeAliasSugg {
     #[suggestion(ast_passes_remove_suggestion, applicability = "machine-applicable", code = "")]
     Remove {

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -287,7 +287,6 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                 None => "value".to_owned(),
             };
             if needs_note {
-                let ty = self.infcx.tcx.short_string(ty, err.long_ty_path());
                 if let Some(local) = place.as_local() {
                     let span = self.body.local_decls[local].source_info.span;
                     err.subdiagnostic(crate::session_diagnostics::TypeNoCopy::Label {