[vala] Fix error message for 'incompatible operand' - added line number

[Jürg Billeter <juergbi src gnome org>]

commit 768239beeb300b230446d75eaa62ac3a50e48c8c
Author: Adam Folmert <afolmert gmail com>
Date:   Fri Feb 19 00:44:29 2010 +0100

    Fix error message for 'incompatible operand' - added line number
    
    Fixes bug 610414.

 vala/valaassignment.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vala/valaassignment.vala b/vala/valaassignment.vala
index 004cc7f..877d3ed 100644
--- a/vala/valaassignment.vala
+++ b/vala/valaassignment.vala
@@ -187,7 +187,7 @@ public class Vala.Assignment : Expression {
 			if (!(ma.symbol_reference is Signal)) {
 				var old_value = new MemberAccess (ma.inner, ma.member_name);
 
-				var bin = new BinaryExpression (BinaryOperator.PLUS, old_value, right);
+				var bin = new BinaryExpression (BinaryOperator.PLUS, old_value, right, source_reference);
 				bin.target_type = right.target_type;
 				right.target_type = right.target_type.copy ();
 				right.target_type.value_owned = false;