nl_tokens: The runInFiber () function provides the prolog / epilog wrapper code for running a function inside a fiber . The runInFiber () function accepts a RunContext instance and calls the wrapped function specified there . The final return / throw value of the wrapped function is used to notify the promise resolver and / or callback specified in the RunContext . This function must take all its information in a single argument because it is called via Fiber#run () which accepts one argument . NB : Since try / catch / finally prevents V8 optimisations the function is split into several parts .
pl_tokens: function runInFiber ( runCtx ) { try { tryBlock ( runCtx ) ; } catch ( <mask> ) { catchBlock ( runCtx , err ) ; } finally { finallyBlock ( runCtx ) ; } }