[vala] Only allow null default value for out parameters

[Jürg Billeter <juergbi src gnome org>]

commit 645b7ce16d84055601f5a519f2ca538029299fff
Author: Luca Bruno <lucabru src gnome org>
Date:   Mon Dec 20 13:17:00 2010 +0100

    Only allow null default value for out parameters
    
    Fixes bug 636096.

 vala/valaparameter.vala |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/vala/valaparameter.vala b/vala/valaparameter.vala
index d73e25c..aea16ef 100644
--- a/vala/valaparameter.vala
+++ b/vala/valaparameter.vala
@@ -262,6 +262,8 @@ public class Vala.Parameter : Variable {
 			    && !variable_type.nullable
 			    && direction != ParameterDirection.OUT) {
 				Report.warning (source_reference, "`null' incompatible with parameter type `%s`".printf (variable_type.to_string ()));
+			} else if (!(initializer is NullLiteral) && direction == ParameterDirection.OUT) {
+				Report.error (source_reference, "only `null' is allowed as default value for out parameters");
 			}
 		}