[vala] Add CharacterLiteral.to_string() to fix writing vapi file

[Jürg Billeter <juergbi src gnome org>]

commit ba46ece055e60a6a33a5297a1d713e2860129e7d
Author: Luca Bruno <lethalman88 gmail com>
Date:   Sat Feb 27 12:12:23 2010 +0100

    Add CharacterLiteral.to_string() to fix writing vapi file

 vala/valacharacterliteral.vala |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/vala/valacharacterliteral.vala b/vala/valacharacterliteral.vala
index f671535..9ab7a8c 100644
--- a/vala/valacharacterliteral.vala
+++ b/vala/valacharacterliteral.vala
@@ -78,6 +78,10 @@ public class Vala.CharacterLiteral : Literal {
 		return true;
 	}
 
+	public override string to_string () {
+		return value;
+	}
+
 	public override bool check (SemanticAnalyzer analyzer) {
 		if (checked) {
 			return !error;