Regression test for crbug.com/572401025.
{
    id : <messageId>
    result : {
        locations : [
            [0] : {
                columnNumber : 0
                lineNumber : 0
                scriptId : <scriptId>
            }
        ]
    }
}
{
    id : <messageId>
    result : {
        exceptionDetails : {
            columnNumber : 6
            exception : {
                className : ReferenceError
                description : ReferenceError: Cannot access 'x' before initialization     at f (target.js:10:7)     at <anonymous>:1:13
                objectId : <objectId>
                subtype : error
                type : object
            }
            exceptionId : <exceptionId>
            lineNumber : 9
            scriptId : <scriptId>
            text : Uncaught
        }
        result : {
            className : ReferenceError
            description : ReferenceError: Cannot access 'x' before initialization     at f (target.js:10:7)     at <anonymous>:1:13
            objectId : <objectId>
            subtype : error
            type : object
        }
    }
}
