[gjs/wip/ptomato/mozjs45prep: 8/32] boxed: Undefined value for field property

[Philip Chimento <pchimento src gnome org>]

commit b0a73463ba49a9a3e25d0db25b1de3e1d55c8937
Author: Philip Chimento <philip chimento gmail com>
Date:   Wed Mar 22 17:37:56 2017 +0000

    boxed: Undefined value for field property
    
    For boxed instances, the fields are implemented as properties with a
    getter and setter. In SpiderMonkey 45, those properties are required to
    have a value of undefined, rather than the (arbitrarily chosen) value of
    null that we previously had.

 gi/boxed.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gi/boxed.cpp b/gi/boxed.cpp
index 34d3ac8..466127f 100644
--- a/gi/boxed.cpp
+++ b/gi/boxed.cpp
@@ -888,7 +888,7 @@ define_boxed_class_fields(JSContext       *cx,
         if (!setter)
             return false;
 
-        if (!JS_DefineProperty(cx, proto, field_name, JS::NullHandleValue,
+        if (!JS_DefineProperty(cx, proto, field_name, JS::UndefinedHandleValue,
                                JSPROP_PERMANENT | JSPROP_SHARED | JSPROP_GETTER | JSPROP_SETTER,
                                JS_DATA_TO_FUNC_PTR(JSNative, getter.get()),
                                JS_DATA_TO_FUNC_PTR(JSNative, setter.get())))