Index: src/Common/SemanticError.h
===================================================================
--- src/Common/SemanticError.h	(revision aeec6b776d14e45c7d0eae9f5b5c1a1a6ab38bea)
+++ src/Common/SemanticError.h	(revision 2e0285177bb7e5cdc2afd200e041b827f132f1a3)
@@ -56,4 +56,5 @@
 	{"reference-conversion"   , "rvalue to reference conversion of rvalue: %s" , Severity::Warn},
 	{"qualifiers-zero_t-one_t", "questionable use of type qualifier %s with %s", Severity::Warn},
+	{"aggregate-forward-decl" , "forward declaration of nested aggregate: %s"  , Severity::Warn},
 };
 
@@ -62,4 +63,5 @@
 	RvalueToReferenceConversion,
 	BadQualifiersZeroOne,
+	AggrForwardDecl,
 	NUMBER_OF_WARNINGS, //This MUST be the last warning
 };