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Sub-task
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    Resolution: Invalid
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P2: Important
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    None
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    None
 
Autotest: tst_QScriptContext::pushAndPopContext()
Calling callee() on a QScriptContext that isn't associated with a 
function call (for which we have V8::Arguments). When we have 
V8::AccessorInfo we may want to return something, for other cases we can 
return an invalid value.