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-rw-r--r--src/librustc_errors/emitter.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/librustc_errors/emitter.rs b/src/librustc_errors/emitter.rs
index 0c7aa3582ac..9aea46da68b 100644
--- a/src/librustc_errors/emitter.rs
+++ b/src/librustc_errors/emitter.rs
@@ -1026,7 +1026,8 @@ impl EmitterWriter {
         children.iter()
             .map(|sub| self.get_multispan_max_line_num(&sub.span))
             .max()
-            .unwrap_or(primary)
+            .unwrap_or(0)
+            .max(primary)
     }
 
     /// Adds a left margin to every line but the first, given a padding length and the label being