Auto merge of #108934 - matthiaskrgr:rollup-vm414p5, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #106915 (Only load one CSS theme by default)
 - #108294 (Place binder correctly for arbitrary trait bound suggestion)
 - #108778 (x fmt: Don't print all modified files if there's more than 10)
 - #108854 (feat/refactor: improve errors in case of ident with number at start)
 - #108870 (Fix invalid inlining of reexport of reexport of private item)
 - #108917 (Consider target_family as pal)
 - #108922 (Add auto notification for changes to stable mir)
 - #108929 (Fix typo in span_map.rs)

Failed merges:

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

1 files changed, 9 insertions, 8 deletions

diff --git a/compiler/rustc_parse/src/errors.rs b/compiler/rustc_parse/src/errors.rs
index 1662db36d10..63e5bc50513 100644
--- a/compiler/rustc_parse/src/errors.rs
+++ b/compiler/rustc_parse/src/errors.rs
@@ -939,6 +939,7 @@ pub(crate) struct ExpectedIdentifier {
     pub token: Token,
     pub suggest_raw: Option<SuggEscapeToUseAsIdentifier>,
     pub suggest_remove_comma: Option<SuggRemoveComma>,
+    pub help_cannot_start_number: Option<HelpIdentifierStartsWithNumber>,
 }
 
 impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for ExpectedIdentifier {
@@ -975,10 +976,18 @@ impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for ExpectedIdentifier {
             sugg.add_to_diagnostic(&mut diag);
         }
 
+        if let Some(help) = self.help_cannot_start_number {
+            help.add_to_diagnostic(&mut diag);
+        }
+
         diag
     }
 }
 
+#[derive(Subdiagnostic)]
+#[help(parse_invalid_identifier_with_leading_number)]
+pub(crate) struct HelpIdentifierStartsWithNumber;
+
 pub(crate) struct ExpectedSemi {
     pub span: Span,
     pub token: Token,
@@ -1208,14 +1217,6 @@ pub(crate) struct SelfParamNotFirst {
 }
 
 #[derive(Diagnostic)]
-#[diag(parse_invalid_identifier_with_leading_number)]
-pub(crate) struct InvalidIdentiferStartsWithNumber {
-    #[primary_span]
-    #[label]
-    pub span: Span,
-}
-
-#[derive(Diagnostic)]
 #[diag(parse_const_generic_without_braces)]
 pub(crate) struct ConstGenericWithoutBraces {
     #[primary_span]