Index: src/SymTab/Validate.cc
===================================================================
--- src/SymTab/Validate.cc	(revision d7dc82447d825854b37e78a7aa777b1a58e7e1b2)
+++ src/SymTab/Validate.cc	(revision 436c0deab931c3644feb0da7d5a23034b5e7cfd3)
@@ -66,4 +66,5 @@
 #include "ResolvExpr/typeops.h"
 
+#include "SynTree/Attribute.h"
 #include "SynTree/Expression.h"
 #include "SynTree/Mutator.h"
@@ -927,4 +928,5 @@
 				ret->set_name( toString( "_retval_", CodeGen::genName( functionDecl ) ) );
 			}
+			ret->get_attributes().push_back( new Attribute( "unused" ) );
 		}
 	}