1 files changed, 6 insertions, 1 deletions
diff --git a/src/main/java/org/shedlang/compiler/patio/protobuf/PatioToProtobuf.java b/src/main/java/org/shedlang/compiler/patio/protobuf/PatioToProtobuf.java
index 9ed1789e..71e74967 100644
--- a/src/main/java/org/shedlang/compiler/patio/protobuf/PatioToProtobuf.java
+++ b/src/main/java/org/shedlang/compiler/patio/protobuf/PatioToProtobuf.java
@@ -80,7 +80,11 @@ public class PatioToProtobuf {
                 );
 
             case DATA_ELEMENT_MUTABLE_DECLARATION ->
-                throw new UnsupportedOperationException("TODO");
+                new PatioDataElementMutableDeclaration(
+                    elementProtobuf.getDataElementMutableDeclaration().getName(),
+                    deserializeDataLayout(elementProtobuf.getDataElementMutableDeclaration().getLayout()),
+                    deserializeSource(elementProtobuf.getDataElementMutableDeclaration().getSource(), parentSource)
+                );
 
             case DATA_ELEMENT_MUTABLE_DEFINITION ->
                 throw new UnsupportedOperationException("TODO");
@@ -109,6 +113,7 @@ public class PatioToProtobuf {
         var builder = PatioProtobuf.PatioDataElementMutableDeclaration.newBuilder();
         builder.setSource(serializeSource(element.source(), parentSource));
         builder.setName(element.name());
+        builder.setLayout(serializeDataLayout(element.layout()));
         return builder.build();
     }