Summarise columns are not immediately available

[nathaneastwood]

Take the following code as an example

d <- data.frame(x = 1:4)
res <- d %>%
  summarise(y = sum(x), z = y + 2)
# Error in eval(substitute(expr), data, enclos = parent.frame()) : 
#  object 'y' not found

In dplyr this works fine and returns z as expected.