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-rw-r--r--compiler/rustc_errors/src/diagnostic_builder.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_errors/src/diagnostic_builder.rs b/compiler/rustc_errors/src/diagnostic_builder.rs
index 9e68ee282e6..04159bff4ff 100644
--- a/compiler/rustc_errors/src/diagnostic_builder.rs
+++ b/compiler/rustc_errors/src/diagnostic_builder.rs
@@ -566,7 +566,7 @@ impl Drop for DiagnosticBuilderInner<'_> {
                         ),
                     ));
                     handler.emit_diagnostic(&mut self.diagnostic);
-                    panic!();
+                    panic!("error was constructed but not emitted");
                 }
             }
             // `.emit()` was previously called, or maybe we're during `.cancel()`.