1 files changed, 9 insertions, 0 deletions
diff --git a/compiler/rustc_errors/src/diagnostic.rs b/compiler/rustc_errors/src/diagnostic.rs
index fe9797026de..5746c28a2ab 100644
--- a/compiler/rustc_errors/src/diagnostic.rs
+++ b/compiler/rustc_errors/src/diagnostic.rs
@@ -417,6 +417,15 @@ impl DiagInner {
         self.args = std::mem::take(&mut self.reserved_args);
     }
 
+    pub fn emitted_at_sub_diag(&self) -> Subdiag {
+        let track = format!("-Ztrack-diagnostics: created at {}", self.emitted_at);
+        Subdiag {
+            level: crate::Level::Note,
+            messages: vec![(DiagMessage::Str(Cow::Owned(track)), Style::NoStyle)],
+            span: MultiSpan::new(),
+        }
+    }
+
     /// Fields used for Hash, and PartialEq trait.
     fn keys(
         &self,