[vala] Implement replace_expression for constant initializers

[Jürg Billeter <juergbi src gnome org>]

commit e36d521e5511374876ba936b3d3d94ebffd2c470
Author: Jürg Billeter <j bitron ch>
Date:   Sat Jun 5 09:58:01 2010 +0200

    Implement replace_expression for constant initializers

 vala/valaconstant.vala |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/vala/valaconstant.vala b/vala/valaconstant.vala
index b382bcb..6c0ee9e 100644
--- a/vala/valaconstant.vala
+++ b/vala/valaconstant.vala
@@ -122,6 +122,12 @@ public class Vala.Constant : Member, Lockable {
 		lock_used = used;
 	}
 
+	public override void replace_expression (Expression old_node, Expression new_node) {
+		if (initializer == old_node) {
+			initializer = new_node;
+		}
+	}
+
 	public override void replace_type (DataType old_type, DataType new_type) {
 		if (type_reference == old_type) {
 			type_reference = new_type;