[vala] Report error when trying to disconnect lambda expression from signal

[Jürg Billeter <juergbi src gnome org>]

commit b5485f6adad9d94ad298c8c63b8e3004321b8287
Author: Jürg Billeter <j bitron ch>
Date:   Sat Oct 16 10:20:36 2010 +0200

    Report error when trying to disconnect lambda expression from signal
    
    Fixes bug 631022.

 codegen/valagsignalmodule.vala |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/codegen/valagsignalmodule.vala b/codegen/valagsignalmodule.vala
index eee3fc7..38e99bf 100644
--- a/codegen/valagsignalmodule.vala
+++ b/codegen/valagsignalmodule.vala
@@ -623,6 +623,9 @@ public class Vala.GSignalModule : GObjectModule {
 			}
 		} else {
 			// disconnect
+			if (handler is LambdaExpression) {
+				Report.error (handler.source_reference, "Cannot disconnect lambda expression from signal. Use Object.disconnect.");
+			}
 			if (sig is DynamicSignal) {
 				connect_func = get_dynamic_signal_disconnect_wrapper_name ((DynamicSignal) sig);
 			} else {