[vala] Fix crash with nested lambda expressions

[Jürg Billeter <juergbi src gnome org>]

commit b28d713d6ec4e5be612c983b2085f962f2871f0e
Author: Jürg Billeter <j bitron ch>
Date:   Mon Mar 30 19:29:34 2009 +0200

    Fix crash with nested lambda expressions
    
    Fixes bug 570872.
---
 vala/valalambdaexpression.vala |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/vala/valalambdaexpression.vala b/vala/valalambdaexpression.vala
index 042df58..37c5fb7 100644
--- a/vala/valalambdaexpression.vala
+++ b/vala/valalambdaexpression.vala
@@ -137,6 +137,25 @@ public class Vala.LambdaExpression : Expression {
 		method = new Method (get_lambda_name (analyzer), cb.return_type);
 		if (!cb.has_target || !analyzer.is_in_instance_method ()) {
 			method.binding = MemberBinding.STATIC;
+		} else {
+			var sym = analyzer.current_symbol;
+			while (method.this_parameter == null) {
+				if (sym is Property) {
+					var prop = (Property) sym;
+					method.this_parameter = prop.this_parameter;
+				} else if (sym is Constructor) {
+					var c = (Constructor) sym;
+					method.this_parameter = c.this_parameter;
+				} else if (sym is Destructor) {
+					var d = (Destructor) sym;
+					method.this_parameter = d.this_parameter;
+				} else if (sym is Method) {
+					var m = (Method) sym;
+					method.this_parameter = m.this_parameter;
+				}
+
+				sym = sym.parent_symbol;
+			}
 		}
 		method.owner = analyzer.current_symbol.scope;