Set paused_=true before calling an asynchronous callback in stepCallExpression (#84)
Set paused_=true before calling an asynchronous callback in stepCallExpression (#84)

Needed when a synchronous function is declared as asynchronous one.
Because then the callback will be called (paused_ will be reset to false) before paused_ was set to true_.
In this case the execution of the interpreter will be stopped unexpectedly.
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