Index: src/SymTab/Validate.cc
===================================================================
--- src/SymTab/Validate.cc	(revision 10e90cbfae38eadd2a8280da88fb0696174ffdda)
+++ src/SymTab/Validate.cc	(revision c6d2e93bfd6a0caeb7c1a8f8538a7c191db59339)
@@ -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" ) );
 		}
 	}