UPDATE - rename SessionSubdiagnostic macro to Subdiagnostic

Also renames:
- sym::AddSubdiagnostic to sym:: Subdiagnostic
- rustc_diagnostic_item = "AddSubdiagnostic" to rustc_diagnostic_item = "Subdiagnostic"

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_attr/src/session_diagnostics.rs b/compiler/rustc_attr/src/session_diagnostics.rs
index 5e8f9b79850..940a48ed915 100644
--- a/compiler/rustc_attr/src/session_diagnostics.rs
+++ b/compiler/rustc_attr/src/session_diagnostics.rs
@@ -98,7 +98,7 @@ pub(crate) struct InvalidIssueString {
 
 // The error kinds of `IntErrorKind` are duplicated here in order to allow the messages to be
 // translatable.
-#[derive(SessionSubdiagnostic)]
+#[derive(Subdiagnostic)]
 pub(crate) enum InvalidIssueStringCause {
     #[label(attr::must_not_be_zero)]
     MustNotBeZero {
@@ -274,7 +274,7 @@ pub(crate) struct IncorrectReprFormatGeneric<'a> {
     pub cause: Option<IncorrectReprFormatGenericCause<'a>>,
 }
 
-#[derive(SessionSubdiagnostic)]
+#[derive(Subdiagnostic)]
 pub(crate) enum IncorrectReprFormatGenericCause<'a> {
     #[suggestion(attr::suggestion, code = "{name}({int})", applicability = "machine-applicable")]
     Int {