The MemoryInstrumentation class that wraps the memory tracing mojo APIs has some callbacks for completion. These are currently repeating callbacks even though they are only called once. This makes it more confusing to bind moved parameters in the callback.

Summarizing second-hand knowledge: Apparently changing this requires changing the mojo definition but the "once-vs-repeating" flag is per interface and one of the other callbacks needs to be repeating. Things may need more refactoring.