[vala] Consider negative literals constant

[Jürg Billeter <juergbi src gnome org>]

commit 11764759cbec71a1f07bb65e85f27e18a2c2770c
Author: Jürg Billeter <j bitron ch>
Date:   Fri Jan 8 22:07:56 2010 +0100

    Consider negative literals constant
    
    Fixes bug 605158.

 vala/valaunaryexpression.vala |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/vala/valaunaryexpression.vala b/vala/valaunaryexpression.vala
index b2066a3..f5b99e4 100644
--- a/vala/valaunaryexpression.vala
+++ b/vala/valaunaryexpression.vala
@@ -1,6 +1,6 @@
 /* valaunaryexpression.vala
  *
- * Copyright (C) 2006-2009  Jürg Billeter
+ * Copyright (C) 2006-2010  Jürg Billeter
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -96,6 +96,14 @@ public class Vala.UnaryExpression : Expression {
 		return get_operator_string () + _inner.to_string ();
 	}
 
+	public override bool is_constant () {
+		if (operator == UnaryOperator.INCREMENT || operator == UnaryOperator.DECREMENT) {
+			return false;
+		}
+
+		return inner.is_constant ();
+	}
+
 	public override bool is_pure () {
 		if (operator == UnaryOperator.INCREMENT || operator == UnaryOperator.DECREMENT) {
 			return false;