blackdrag commented on code in PR #3058:
URL: https://github.com/apache/groovy/pull/3058#discussion_r4428616543


##########
src/main/java/org/codehaus/groovy/transform/sc/StaticCompilationVisitor.java:
##########
@@ -376,8 +378,12 @@ public void visitField(final FieldNode node) {
                 ClassNode declaringClass = node.getDeclaringClass();
                 if (declaringClass != null) {
                     if 
(StaticTypeCheckingSupport.implementsInterfaceOrIsSubclassOf(declaringClass, 
ClassHelper.LIST_TYPE)) {
-                        boolean spread = 
declaringClass.getDeclaredField(node.getName()) != node;
-                        pexp.setSpreadSafe(spread);
+                        boolean declaredField = 
declaringClass.getDeclaredField(node.getName()) == node;
+                        // GROOVY-12534: the virtual field for an extension 
setter is not an element
+                        // property. A declared field, or a real one-argument 
setter, is unchanged.
+                        if (declaredField || 
declaresUnarySetter(declaringClass, node.getName())) {
+                            pexp.setSpreadSafe(!declaredField);

Review Comment:
   why would we want to set it to false here?



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