Can create corrupt data frame with matrix indexing

[hadley]

bar <- data_frame(a = c("a", "b"))
foo <- bar[matrix(TRUE, nrow = 2, ncol = 1)]
foo

This is the root cause of tidyverse/dplyr#1798

[krlmlr]

What's the expected output? Do tibbles support matrix indexing? I'd very much like to raise an error whenever a matrix is passed.

[hadley]

I think this should be an error

[github-actions]

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