[vala] Check parameter directions in inherited methods

[Luca Bruno <lucabru src gnome org>]

commit 00673f24ce975196cf1c2b01c8ca1bef8c946658
Author: Simon Werbeck <simon werbeck gmail com>
Date:   Fri Mar 29 03:12:38 2013 +0100

    Check parameter directions in inherited methods
    
    Fixes bug 695214.

 vala/valamethod.vala |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/vala/valamethod.vala b/vala/valamethod.vala
index 7af50e8..cf02d60 100644
--- a/vala/valamethod.vala
+++ b/vala/valamethod.vala
@@ -327,6 +327,11 @@ public class Vala.Method : Subroutine {
                                return false;
                        }
                        if (!base_param.ellipsis) {
+                               if (base_param.direction != param.direction) {
+                                       invalid_match = "incompatible direction of parameter %d".printf 
(param_index);
+                                       return false;
+                               }
+
                                actual_base_type = base_param.variable_type.get_actual_type (object_type, 
null, this);
                                if (!actual_base_type.equals (param.variable_type)) {
                                        invalid_match = "incompatible type of parameter %d".printf 
(param_index);