For my own programs I have created an `asyncLog` proc which does exactly what `asyncCheck` does, except it logs errors to terminal.
We have a number of options here: * Add a similar proc to stdlib * Make what `asyncCheck` does overridable, so that we don't need to change all our `asyncCheck` calls. * Eliminate the need for `asyncCheck`. This is more difficult, and not sure we can do this without breaking existing code, but would be nice.
