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-rw-r--r--src/librustc_errors/lib.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/librustc_errors/lib.rs b/src/librustc_errors/lib.rs
index 999c3470e71..2279ed85954 100644
--- a/src/librustc_errors/lib.rs
+++ b/src/librustc_errors/lib.rs
@@ -746,7 +746,8 @@ impl HandlerInner {
             !this.emitted_diagnostics.insert(diagnostic_hash)
         };
 
-        // Only emit the diagnostic if we haven't already emitted an equivalent one.
+        // Only emit the diagnostic if we've been asked to deduplicate and
+        // haven't already emitted an equivalent diagnostic.
         if !(self.flags.deduplicate_diagnostics && already_emitted(self)) {
             self.emitter.emit_diagnostic(diagnostic);
             if diagnostic.is_error() {