[vala] Deprecate use of += and -= for signals

[Jürg Billeter <juergbi src gnome org>]

commit c353329b280f945d6d8188af5817ae44723d6e1d
Author: Luca Bruno <lethalman88 gmail com>
Date:   Tue Jun 1 22:06:17 2010 +0200

    Deprecate use of += and -= for signals
    
    The connect/disconnect methods should be used instead.
    
    Fixes bug 617571.

 vala/valaassignment.vala |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/vala/valaassignment.vala b/vala/valaassignment.vala
index 7772566..5833e6b 100644
--- a/vala/valaassignment.vala
+++ b/vala/valaassignment.vala
@@ -164,7 +164,13 @@ public class Vala.Assignment : Expression {
 
 			if (ma.symbol_reference is DynamicSignal) {
 				// target_type not available for dynamic signals
+				if (!analyzer.context.deprecated) {
+					Report.warning (source_reference, "deprecated syntax, use `connect' method instead");
+				}
 			} else if (ma.symbol_reference is Signal) {
+				if (!analyzer.context.deprecated) {
+					Report.warning (source_reference, "deprecated syntax, use `connect' method instead");
+				}
 				var sig = (Signal) ma.symbol_reference;
 				right.target_type = new DelegateType (sig.get_delegate (ma.inner.value_type, this));
 			} else {