[gjs/wip/ptomato/mozjs45prep: 5/26] boxed: Undefined value for field property

[Philip Chimento <pchimento src gnome org>]

commit 35ff70e7a59e018be074ef7b11799d820fd0d97f
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 e212b27..735145d 100644
--- a/gi/boxed.cpp
+++ b/gi/boxed.cpp
@@ -887,7 +887,7 @@ 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())))