Add needed forward declaration

Dr15Jones · Dr15Jones · commit 0ea1997187e3 · 2025-07-13T08:59:08.000-05:00
diff --git a/Mixing/Base/src/SecondaryEventProvider.h b/Mixing/Base/src/SecondaryEventProvider.h
@@ -11,6 +11,7 @@
 
 namespace edm {
   class ModuleCallingContext;
+  class ExceptionCollector;
 
   class SecondaryEventProvider {
   public:
