Closures and generators are really hard to reason about in backtraces.
For generators, I took the exact name of the method and put ##$continuation##. I put it at the end so it reads exactly like a method name since in WWW we use them almost the same as the method itself.
For closures, I named the class ##Closue$Class::method#num## where num is an optional autoincrementing number.
I decided to stop prefixing the methods with ##0## which is breaking the reflection tests.
This basically redoes D782498 and D750608 but it works in repo mode.
Paul Tarjan