rownames(dt[, -"col"]) hanging under R 3.4

With the latest commit 5b16cc5, the following code will end up in hanging:

library(data.table)

dt <- data.table(id = 1:10, x = rnorm(10))
rownames(dt) # works
rownames(dt[, .(id)]) # works
rownames(dt[, -"id"]) ## hanging!

This happens under R 3.4.x. It does not hang under R 3.5.x.

Thanks for reporting!
On 3.4.4 I am getting following error

rownames(dt[, -"id"])
#Error: cannot allocate vector of size 5.1 Gb

On 3.5.1 I am getting

rownames(dt[,-"id"])
#character(0)

which is actually not a correct answer, reported in #3217

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