[vala/staging] vala: Make source_reference optional for ObjectCreationExpression

[Rico Tzschichholz <ricotz src gnome org>]

commit 2677aa9dacee72f7b1b799c8034fb4e45ba0ddfe
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Oct 24 14:06:49 2018 +0200

    vala: Make source_reference optional for ObjectCreationExpression

 vala/valaobjectcreationexpression.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/vala/valaobjectcreationexpression.vala b/vala/valaobjectcreationexpression.vala
index ff0e818e3..0b6a29391 100644
--- a/vala/valaobjectcreationexpression.vala
+++ b/vala/valaobjectcreationexpression.vala
@@ -69,7 +69,7 @@ public class Vala.ObjectCreationExpression : Expression {
         * @param source_reference reference to source code
         * @return                 newly created object creation expression
         */
-       public ObjectCreationExpression (MemberAccess? member_name, SourceReference source_reference) {
+       public ObjectCreationExpression (MemberAccess? member_name, SourceReference? source_reference = null) 
{
                this.source_reference = source_reference;
                this.member_name = member_name;
        }