fix for issue 3840.17.5

aliased scalars in !!set would not round trip with ?

1 files changed, 4 insertions, 1 deletions

diff --git a/serializer.py b/serializer.py
index 1a78829..cc2329d 100644
--- a/serializer.py
+++ b/serializer.py
@@ -154,7 +154,10 @@ class Serializer:
         # type: (Any, Any, Any) -> None
         alias = self.anchors[node]
         if node in self.serialized_nodes:
-            self.emitter.emit(AliasEvent(alias))
+            node_style = getattr(node, 'style', None)
+            if node_style != '?':
+                node_style = None
+            self.emitter.emit(AliasEvent(alias, style=node_style))
         else:
             self.serialized_nodes[node] = True
             self.resolver.descend_resolver(parent, index)