How to identify closures

Maybe get some input from @fgnass too?

Trying to debug a memory leak, and its only retainer is marked `(closure)`. Unfortunately there are hundreds of anonymous functions and callbacks in my code. How could I go about labelling them (or getting v8 to label them) without manually re-writing the whole thing?

The issue names no file, test, or entry point to inspect. Start by understanding the tutorial's existing memory-leak debugging guidance and the V8 closure-retainer context; done would be a concrete, documented way to distinguish anonymous functions or label them without rewriting the application.

Written by the indexing model from the issue text.