Croma.ListMonad.m

You're seeing just the macro m, go back to Croma.ListMonad module for more information.

m(list)

A macro that provides Hakell-like do-notation.

MonadImpl.m do
  x <- mx
  y <- my
  pure f(x, y)
end

is expanded to

MonadImpl.bind(mx, fn x ->
  MonadImpl.bind(my, fn y ->
    MonadImpl.pure f(x, y)
  end)
end)