'coincidence' combinator

[mitchellwrosen]

trafficstars

Here's another combinator in reflex missing that's from reactive-banana:

coincidence :: Event (Event a) -> Event a

[ocharles]

Isn't this switchE, but without the monad enforcing that we don't leak?

[HeinrichApfelmus]

A semantic specification would be nice, so that we know what exactly, if anything, to implement. 😄

[mitchellwrosen]

Whoops :)

The returned event emits whenever the outer and inner events emit simultaneously.