
from vctrs
==========

> dplyr_col_select(df1, 2)
Error: Can't subset elements that don't exist.
x Location 2 doesn't exist.
i There are only 1 element.


not returning a data frame
==========================

> dplyr_col_select(df1, 1)
Error: Can't reconstruct data frame.
x The `[` method for class <dplyr_test_broken_operator/tbl_df/tbl/data.frame> must return a data frame.
i It returned a <list>.


unexpected number of columns
============================

> dplyr_col_select(df2, 1)
Error: Can't reconstruct data frame.
x The `[` method for class <dplyr_test_operator_wrong_size/tbl_df/tbl/data.frame> must return a data frame with 1 column.
i It returned a <data.frame> of 0 columns.

