Catch error when step_dummy() tries to create too many columns

[EmilHvitfeldt]

Should there be a catch for this particular error that gets produced in step_dummy() when it tries to calculate too big of a matrix? I realise this will eventually get fixed by #420, but is vector memory exhausted (limit reached?) enough of a hint that x has too many levels/too many rows

library(recipes)

dat <- data.frame(x = as.character(1:100000))

recipe(~ ., data = dat) %>%
  step_dummy(x) %>%
  prep()
#> Error: vector memory exhausted (limit reached?)

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