pushExceptionHandler

Push an exception handler in @context. Whenever a JavaScript exception happens in the #JSCContext, the given @handler will be called. The default #JSCExceptionHandler simply calls jsc_context_throw_exception() to throw the exception to the #JSCContext. If you don't want to catch the exception, but only get notified about it, call jsc_context_throw_exception() in @handler like the default one does. The last exception handler pushed is the only one used by the #JSCContext, use jsc_context_pop_exception_handler() to remove it and set the previous one. When @handler is removed from the context, @destroy_notify i called with @user_data as parameter.

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